- Dec 2022
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www.zhihu.com www.zhihu.com
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和C++相比,Java 学习成本高吗?
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java.lang.NullPointerException为什么不设计成显示null对象的名字或类型?
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www.zhihu.com www.zhihu.com
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Java为什么不自举?
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www.zhihu.com www.zhihu.com
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Java 中, 为什么一个对象的实例方法在执行完成之前其对象可以被 GC 回收?
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www.zhihu.com www.zhihu.com
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Prototype based和Class based的系统哪个更OOP?
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www.zhihu.com www.zhihu.com
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网上说 Java 的性能已经达到甚至超过 C++,是真的吗?
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www.zhihu.com www.zhihu.com
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为什么 Java 把一切啰嗦的东西就集合到一起了?
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www.zhihu.com www.zhihu.com
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www.zhihu.com www.zhihu.com
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Java 中引入内部类的意义?
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www.zhihu.com www.zhihu.com
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Java里一个线程调用了Thread.interrupt()到底意味着什么?
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www.zhihu.com www.zhihu.com
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如何评价王垠博文《PySonar的价值和意义》?
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www.zhihu.com www.zhihu.com
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如何评价王垠的新文章,《给Java说句公道话》?
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www.zhihu.com www.zhihu.com
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Java的函数重载为什么采取静态静态绑定而非动态绑定?
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www.zhihu.com www.zhihu.com
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java变量块级作用域的问题?
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www.zhihu.com www.zhihu.com
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【JAVA】变量声明在循环体内还是循环体外的争论,以及怎样才真正叫『避免在循环体中创建对象』?
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www.zhihu.com www.zhihu.com
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如何评价王垠的《Kotlin和Checked Exception》?
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www.zhihu.com www.zhihu.com
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往Java泛型类中方法传一个对象引用的参数,但是该方法的参数为什么不能调用该对象的方法?
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www.zhihu.com www.zhihu.com
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java为什么不支持泛型数组?
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www.zhihu.com www.zhihu.com
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如何看待Spring 5引入函数式编程思想以及Reactor?
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www.zhihu.com www.zhihu.com
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如何理解types are not classes ?
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www.zhihu.com www.zhihu.com
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Java 泛型 <? super T> 中 super 怎么 理解?与 extends 有何不同?
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www.zhihu.com www.zhihu.com
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Haskell 的带界量化多态和 Java/C# 的接口动态委派,哪一个更有利于优化?灵活性更好?
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www.zhihu.com www.zhihu.com
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如何理解java是一门静态多分派且动态单分派的语言?
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www.zhihu.com www.zhihu.com
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函数式编程如何优雅的处理很多 多个函数都要用到的 参数?
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www.zhihu.com www.zhihu.com
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为何大量设计模式在动态语言中不适用?
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www.zhihu.com www.zhihu.com
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动态类型的语言的优缺点有哪些?
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www.zhihu.com www.zhihu.com
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Java8引入Lambda表达式的利弊?
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www.zhihu.com www.zhihu.com
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JVM里的符号引用如何存储?
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JAVA NIO 不是同步非阻塞I/O吗,为什么说JAVA NIO提供了基于Selector的异步网络I/O?
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www.zhihu.com www.zhihu.com
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为什么说递归效率低?
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www.zhihu.com www.zhihu.com
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有哪些 Java 源代码看了后让你大呼过瘾?
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www.zhihu.com www.zhihu.com
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java注解是怎么实现的?
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www.zhihu.com www.zhihu.com
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Java 动态代理作用是什么?
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www.zhihu.com www.zhihu.com
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如何理解互斥锁、条件锁、读写锁以及自旋锁?
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www.zhihu.com www.zhihu.com
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servlet的本质是什么,它是如何工作的?
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www.zhihu.com www.zhihu.com
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阿里的dubbo 到底是用来干嘛的?为什么网上就没有一篇通俗的文章来介绍这个开源框架?
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www.zhihu.com www.zhihu.com
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现在比较常用到的java框架是什么,对应场景和作用是怎么样?
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www.zhihu.com www.zhihu.com
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Tomcat Server 是如何关联 JRE 和 JDK 的?
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www.zhihu.com www.zhihu.com
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关于后端程序员写前端用什么框架更好?
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www.zhihu.com www.zhihu.com
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64位JVM的long和double读写也不是原子操作么?
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www.zhihu.com www.zhihu.com
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知乎和知乎日报客户端 Android 客户端设置夜间模式是怎样做到不重启 Activity 的?
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www.zhihu.com www.zhihu.com
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新手该如何读openjdk源码?
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www.zhihu.com www.zhihu.com
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为什么 JVM 不用 JIT 全程编译?
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老师说字符串常量和静态变量放在data segment中,问一下这里的data segment和常量池是一回事吗?
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www.zhihu.com www.zhihu.com
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Java switch 语句当参数为java.lang.String时的疑问?
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www.zhihu.com www.zhihu.com
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hotpot java虚拟机Class对象是放在 方法区 还是堆中 ?
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www.zhihu.com www.zhihu.com
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如何自己动手写一个虚拟机?
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www.zhihu.com www.zhihu.com
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关于class loader的一点疑惑?
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www.zhihu.com www.zhihu.com
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OSR(On-Stack Replacement)是怎样的机制?
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www.zhihu.com www.zhihu.com
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Java的泛型强制转换中,下面例子为什么只能有super?
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www.zhihu.com www.zhihu.com
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java clone浅拷贝 调用super.clone()为什么能够转型为当前类型?
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www.zhihu.com www.zhihu.com
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如何生成更高质量的 JVM 字节码?
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www.zhihu.com www.zhihu.com
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Java 的偏向锁是怎么实现的?
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www.zhihu.com www.zhihu.com
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Java 中回调机制是什么原理?
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www.zhihu.com www.zhihu.com
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Java 8的default method是一个好的设计吗?
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www.zhihu.com www.zhihu.com
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Java 的开发效率究竟比 C++ 高在哪里?
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www.zhihu.com www.zhihu.com
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在如下的百度面试题中,如何填写 if 条件才能输出 "ab"?
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www.zhihu.com www.zhihu.com
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怎样算是学好了 Java?
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www.zhihu.com www.zhihu.com
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java annotation 中 SOURCE 和 CLASS 的区别?
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www.zhihu.com www.zhihu.com
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java中关于instanceof 的问题?
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URL
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zhuanlan.zhihu.com zhuanlan.zhihu.com
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一个简单Class文件的分析(多图)
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zhuanlan.zhihu.com zhuanlan.zhihu.com
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Java动态绑定机制的内幕
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java 8 lambda 表达式 编译后为什么在这种情况下没有生成 invokedynamic指令?
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www.zhihu.com www.zhihu.com
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Java中普通lambda表达式和方法引用本质上有什么区别?
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www.zhihu.com www.zhihu.com
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Java 8的Lambda表达式为什么要基于invokedynamic?
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www.zhihu.com www.zhihu.com
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Java 到底是值传递还是引用传递?
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www.zhihu.com www.zhihu.com
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如何评价阿里近期发布的Java编码规范?
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www.zhihu.com www.zhihu.com
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代码结构中Dao,Service,Controller,Util,Model是什么意思,为什么划分?
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www.zhihu.com www.zhihu.com
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怎样理解 Java 注解和运用注解编程?
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www.zhihu.com www.zhihu.com
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java.lang.String 和String难道有区别吗?如何解释下面的问题?
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www.zhihu.com www.zhihu.com
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用Java做一个大流量、高并发的网站应该怎么样进行底层构架?采用哪些框架技术比较适合?
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www.zhihu.com www.zhihu.com
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Java程序员,最常用的20%技术有哪些?
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www.zhihu.com www.zhihu.com
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Java 不能实现真正泛型的原因是什么?
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www.zhihu.com www.zhihu.com
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在Java中为什么实现了Cloneable接口,就能调用Object的clone方法?
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www.zhihu.com www.zhihu.com
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如何从程序优化的角度解释淘宝支付宝的安卓版卡顿?
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www.zhihu.com www.zhihu.com
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一个Java多线程问题?
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www.zhihu.com www.zhihu.com
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JDK9 有哪些值得期待的地方?
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www.zhihu.com www.zhihu.com
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Java 有什么奇技淫巧?
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www.zhihu.com www.zhihu.com
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关于java puzzlers 谜题44 删除类的问题?
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www.zhihu.com www.zhihu.com
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JDK 源码中 HashMap 的 hash 方法原理是什么?
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www.zhihu.com www.zhihu.com
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为什么Java的Hashmap比Python的dictionary慢得多?
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www.zhihu.com www.zhihu.com
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Twitter 使用的是什么 JVM?
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www.zhihu.com www.zhihu.com
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Java 反射到底慢在哪里?
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www.zhihu.com www.zhihu.com
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Java分布式应用如何入门以及有哪些资料?
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www.zhihu.com www.zhihu.com
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谁能用通俗的语言解释一下什么是 RPC 框架?
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www.zhihu.com www.zhihu.com
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有哪位大神能讲下 Executors.callable(Runnable, T) 怎么用?
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www.zhihu.com www.zhihu.com
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java通过反射调用方法,为何无法完成参数向上转型?
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www.zhihu.com www.zhihu.com
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java反射的getConstructors()方法,返回得一个构造函数的数组下标问题?
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www.zhihu.com www.zhihu.com
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Java instanceof 关键字是如何实现的?
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www.zhihu.com www.zhihu.com
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请教这段代码可以加快回收吗?
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www.zhihu.com www.zhihu.com
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为什么Java中的密码优先使用 char[] 而不是String?
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www.zhihu.com www.zhihu.com
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BlockingQueue和List 有什么区别,BlockingQueue用在什么场景下?
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www.zhihu.com www.zhihu.com
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下面代码是线程不安全的代码,请问为什么很难跑出不安全的样例?
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www.zhihu.com www.zhihu.com
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Java8 Functional Interface 疑问?
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www.zhihu.com www.zhihu.com
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Java 为什么不支持多继承?
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www.zhihu.com www.zhihu.com
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Java中,关于String类型的变量和常量做“+”运算时发生了什么?
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www.zhihu.com www.zhihu.com
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Java 所有对象强转到Object之后,都能够完整的强转回去吗?有特例吗?
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Groovy,Clojure和Kotlin都是基于jvm的语言,那他们在实际项目中的运用场景有什么区别?
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www.zhihu.com www.zhihu.com
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Android 架构设计的思想与原则是什么?
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www.zhihu.com www.zhihu.com
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学习 Java 泛型有没有精华的材料、好的学习方法?
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www.zhihu.com www.zhihu.com
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Java虚拟机的堆、栈、堆栈如何去理解?
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www.zhihu.com www.zhihu.com
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java能否获取到引用的名称?
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www.zhihu.com www.zhihu.com
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怎么理解元编程?
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- Oct 2022
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www.wired.com www.wired.com
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Gosling made the observation that computer chips were appearing in toasters, VCRs, and many other household appliances, even in the doorknobs of their Squaw Valley ski-lodge rooms. "That's getting pretty ubiquitous when it's in the bloody doorknob,'' he said. Yet three remote-control devices were needed just to get a television, a VCR, and a living-room sound system to work. Needless to say, most people still couldn't program any of them. The wonder wasn't that chips were everywhere but that they were being used so badly.
Gosling se dio cuenta que los chips estaban en todas partes pero se usaban muy mal (el mismo tenía hasta tres controles remotos)
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www.slideshare.net www.slideshare.net
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www.javatpoint.com www.javatpoint.com
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The program will compile, but not run, because JVM will not recognize the main() method. Remember JVM always looks for the main() method with a string type array as a parameter.
With out String args[] in main().
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www.javatpoint.com www.javatpoint.com
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An object in Java is the physical as well as a logical entity, whereas, a class in Java is a logical entity only.
Object exists but Class is just logical steps to make object. Class --> Blue print and Object ---> Car
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- Aug 2022
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www.cnblogs.com www.cnblogs.com
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.;%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar
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time.geekbang.org time.geekbang.org
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如果使用 Java8 以上版本可以使用 Arrays.stream 方法来转换,否则可以把 int 数组声明为包装类型 Integer 数组:
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time.geekbang.org time.geekbang.org
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进行判等,需要使用 equals 进行内容判等。因为引用类型的直接值是指针,使用 == 的话,比较的是指针,也就是两个对象在内存中的地址,即比较它们是不是同一个对象,而不是比较对象的内容。
默认情况
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- Jul 2022
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chenoi.info chenoi.info
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Primitive Data Types
JAVA的8种数据类型
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- Jun 2022
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www.javatpoint.com www.javatpoint.com
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Difference between Map and HashMap The Map is an interface in Java used to map the key-pair values. It is used to insert, update, remove the elements. Whereas the HashMap is a class of Java collection framework. The Map interface can only be used with an implementing class. It allows to store the values in key-pair combination; it does not allow duplicate keys; however, we can store the duplicate values. Its implementing classes are as follows: HashMap Hashtable TreeMap ConcurrentHashMap LinkedHashMap HashMap is a powerful data structure in Java used to store the key-pair values. It maps a value by its associated key. It allows us to store the null values and null keys. It is a non-synchronized class of Java collection.
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- May 2022
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logit.io logit.io
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null is a reserved word (keyword) in Java for literal values. It is a literal similar to the true and false. In Java, null is a keyword much like the other keywords public, static or final. It is just a value that shows that the object is referring to nothing. The invention of the word “null” originated to denote the absence of something. For example, the absence of the user, a resource, or anything. But, over the years it puts Java programmers in trouble due to the disturbing null pointer exception. When you declare a boolean variable, it gets its default value as false.
java
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- Feb 2022
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mobisoftinfotech.com mobisoftinfotech.com
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Java, one of the most preferred programming languages in the world, has changed the world of software development. It operates virtually everywhere in the digital sphere. This revolutionary programming language has excelled in every way and remained in the list of ‘Top 3 most in-demand languages’ for many years, enabling more job opportunities for engineers.
Java, one of the most preferred programming languages in the world, has changed the world of software development. It operates virtually everywhere in the digital sphere. This revolutionary programming language has excelled in every way and remained in the list of ‘Top 3 most in-demand languages’ for many years, enabling more job opportunities for engineers.
5 Easy Steps to Hire Java Developers Faster: A Tech Recruiter’s Perspective
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- Jan 2022
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developers.redhat.com developers.redhat.com
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Adopting Kubernetes-native environments ensures true portability for the hybrid cloud. However, we also need a Kubernetes-native framework to provide the "glue" for applications to seamlessly integrate with Kubernetes and its services. Without application portability, the hybrid cloud is relegated to an environment-only benefit. That framework is Quarkus.
Quarkus framework
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www.geeksforgeeks.org www.geeksforgeeks.org
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enum can contain both concrete methods and abstract methods. If an enum class has an abstract method, then each instance of the enum class must implement it
Yet to explore abstract methods for java enums
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We can’t create enum objects explicitly and hence we can’t invoke enum constructor directly.
Color c1 = Color.RED;
Color is the enum and "RED" is internally a class object of class "Color".
In which language though, can invoke the constructor directly? I guess by using the parameterized constructors, one can invoke other constructors easily.
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Since it is static, we can access it by using the enum Name. Since it is final, we can’t create child enums.
enum in java is implemented as a class. The static and final keywords have their meanings.
An enum cannot explicitly inherit a class not can it create child enums.
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enum can implement many interfaces
Have to learn about Interfaces.
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All enums implicitly extend java.lang.Enum class. As a class can only extend one parent in Java, so an enum cannot extend anything else.
In Java, a class can extend only one parent class. Also, an enum implicitly extends the java.lang.Enum class. Therefore, an enum cannot extend anything else.
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In Java, we can also add variables, methods and constructors to it
java enums allow one to add variables, methods and constructors. Java enums are apparently more powerful than C++ enums
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enum type can be passed as an argument to switch statement.
An enum object can be created and the object can be passed as an argument.
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- Jul 2021
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www.flowerbrackets.com www.flowerbrackets.com
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Multiple inheritance is one of the object oriented feature where a class or a sub class can inherit features from more than one parent class or super class.
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Interface is collection of methods of abstract type (having empty body). It’s similar to Abstract class. Interface is blueprint of class. Interface specify what class must do and not how to.
A class which implements interface should define each and every method in the class. Interface is used to implement multiple inheritance in java (represent IS-A relationship).
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www.interviewbit.com www.interviewbit.com
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Java is the mother tongue of approximately 9 million developers around the globe. Developed first in 1995 by Sun Microsystems, Java has evolved to become one of the most popular languages to be used in the software industry. It is fast, secure, and reliable, therefore, used to make applications ranging from software design and gaming technology to web and mobile applications.
More on InterviewBit
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towardsdatascience.com towardsdatascience.com
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Uber and Booking.com’s ecosystem was originally JVM-based but they expanded to support Python models/scripts. Spotify made heavy use of Scala in the first iteration of their platform until they received feedback like:some ML engineers would never consider adding Scala to their Python-based workflow.
Python might be even more popular due to MLOps
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- Jun 2021
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docs.oracle.com docs.oracle.com
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It is a compile-time error if an enum declaration has the modifier abstract orfinal.
enum is implicitly static and final, no reason to have modifiers final and abstract.
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docs.oracle.com docs.oracle.com
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Table 4.1-A. class file format major versions
This is very helpful for troubleshooting
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www.w3schools.com www.w3schools.com
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For attributes, methods and constructors, you can use the one of the following:
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- Mar 2021
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www.baeldung.com www.baeldung.com
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- Feb 2021
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twitter.com twitter.com
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Rewritten rsync on java., post on GitHub.
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www.cleveroad.com www.cleveroad.com
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Offshore Software Development
Check this article about software development offshore team building - it will help you to understamd how to choose team for your business.
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- Sep 2020
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github.com github.com
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Tribuo is a machine learning library in Java that provides multi-class classification, regression, clustering, anomaly detection and multi-label classification.
Tribuo - Java ML library from Oracle
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- Aug 2020
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diego-pacheco.blogspot.com diego-pacheco.blogspot.com
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stackoverflow.blog stackoverflow.blog
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Java may have been designed as a completely object oriented language, but when Java SE 8 was released in 2014, it added Lambda expressions (aka closures), which added some functional programming elements. Not every problem is best served by OOP, and by adding Lambdas, Java became more flexible.
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- Jul 2020
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www.duinsoft.nl www.duinsoft.nl
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A shell script to automate the retrieval and installation of the Oracle (Sun) Java Runtime Environment
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- Jun 2020
- May 2020
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muldoon.cloud muldoon.cloud
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Programming languages These will probably expose my ignorance pretty nicely.
When to use different programming languages (advice from an Amazon employee):
- Java - enterprise applications
- C# - Microsoft's spin on Java (useful in the Microsoft's ecosystem)
- Ruby - when speed is more important then legibility or debugging
- Python - same as Ruby but also for ML/AI (don't forget to use type hinting to make life a little saner)
- Go/Rust - fresh web service where latency and performance were more important than community/library support
- Haskell/Erlang - for very elegant/mathematical functional approach without a lot of business logic
- Clojure - in situation when you love Lisp (?)
- Kotlin/Scala - languages compiling to JVM bytecode (preferable over Clojure). Kotlin works with Java and has great IntelliJ support
- C - classes of applications (operating systems, language design, low-level programming and hardware)
- C++ - robotics, video games and high frequency trading where the performance gains from no garbage collection make it preferable to Java
- PHP/Hack - testing server changes without rebuilding. PHP is banned at Amazon due to security reasons, but its successor, Hack, runs a lot of Facebook and Slack's backends
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- Apr 2020
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github.com github.com
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Petermr/openVirus. (n.d.). GitHub. Retrieved April 8, 2020, from https://github.com/petermr/openVirus
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code.visualstudio.com code.visualstudio.com
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To help you get started quickly, we created a special Installer of Visual Studio Code for Java developers. Download Visual Studio Code Java Pack Installer Note: The installer is currently only available for Windows. For other OS, please install those components (JDK, VS Code and Java extensions) individually. We're working on the macOS version, please stay tuned. The package can be used as a clean install or an update for an existing development environment to add Java or Visual Studio Code. Once downloaded and opened, it automatically detects if you have the fundamental components in your local development environment, including the JDK, Visual Studio Code, and essential Java extensions.
If you wish to use Java inside VSCode, try downloading the Installer of Visual Studio Code for Java developers
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- Mar 2020
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www.baeldung.com www.baeldung.com
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URL
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- Dec 2019
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www.galiglobal.com www.galiglobal.com
- Oct 2019
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www.hanselman.com www.hanselman.com
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CoffeeScript is to Ruby as TypeScript is to Java/C#/C++.
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- May 2019
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ttlnews.blogspot.com ttlnews.blogspot.com
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JBoss exception Transaction is not active: javax.transaction.RollbackException: The transaction is not active!
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- Apr 2019
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github.com github.com
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(def current "Get current process PID" (memoize (fn [] (-> (java.lang.management.ManagementFactory/getRuntimeMXBean) (.getName) (string/split #"@") (first)))))
getting current proces id (PID) more importantly:
java.lang.management.ManagementFactory/getRuntimeMXBean
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github.com github.com
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(defn- file? [f] (instance? java.io.File f)) (defn- find-files-in-dir [dir] (filter #(.isFile ^File %) (file-seq dir)))
finding files nice declarative way
file-seq
of this dir
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- Mar 2019
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github.com github.com
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(PushbackReader. (StringReader. s))
PUshbackReader is the basic impl
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- Jan 2019
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docs.oracle.com docs.oracle.com
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after the terminal operation of the stream pipeline commences.
Above is because of the nature of
Stream
s in general: they are lazily executed (or put another way, execution is delayed until the latest convenient method call).
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- Dec 2018
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docs.oracle.com docs.oracle.com
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I don't get why you should seal a package, a better use-case example should be added
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docs.oracle.com docs.oracle.com
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Headers in a manifest Header Definition Name The name of the specification. Specification-Title The title of the specification. Specification-Version The version of the specification. Specification-Vendor The vendor of the specification. Implementation-Title The title of the implementation. Implementation-Version The build number of the implementation. Implementation-Vendor The vendor of the implementation.
It would be nice to have a bit more background, why this stuff is called like this
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docs.oracle.com docs.oracle.com
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To load classes in JAR files within a JAR file into the class path, you must write custom code to load those classes. For example, if MyJar.jar contains another JAR file called MyUtils.jar, you cannot use the Class-Path header in MyJar.jar's manifest to load classes in MyUtils.jar into the class path.
So, other jars have to be extracted.
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The Class-Path header points to classes or JAR files on the local network,
Wait, WHAT? on the local network??? Why would it look on the local network?
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docs.oracle.com docs.oracle.com
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To modify the manifest, you must first prepare a text file containing the information you wish to add to the manifest. You then use the Jar tool's m option to add the information in your file to the manifest.
You don't add a manifest, but you add a second file that contains additional fields
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Warning: The text file from which you are creating the manifest must end with a new line or carriage return. The last line will not be parsed properly if it does not end with a new line or carriage return.
This is very stupid....
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docs.oracle.com docs.oracle.com
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As an example, suppose you wanted to put audio files and gif images used by the TicTacToe demo into a JAR file, and that you wanted all the files to be on the top level, with no directory hierarchy. You could accomplish that by issuing this command from the parent directory of the images and audio directories: jar cf ImageAudio.jar -C images . -C audio .
Don't preserve relative paths
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clojureverse.org clojureverse.org
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Full disclosure: I’m a co-maintainer of clj-time and I’m pretty vocal about encouraging people not to use clj-time when starting a new project: use Java Time instead. Conversion from an existing, clj-time-heavy project is another matter tho’, unfortunately.
sean cornfield co-mainainter of clj-time use Java.Time
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- Nov 2018
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clojurians.slack.com clojurians.slack.com
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in general, clojure doesn't have java interop, it has jvm interop so in places where the java language doesn't map 1:1 to the jvm, clojure gives something that matches the raw jvm, not something that matches the java language
jvm not java interop
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- Oct 2018
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www.paulgraham.com www.paulgraham.com
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Perhaps part of the confusion - and you say this in a different way in your little memo - is that the C/C++ folks see OO as a liberation from a world that has nothing resembling a first-class functions, while Lisp folks see OO as a prison since it limits their use of functions/objects to the style of (9.). In that case, the only way OO can be defended is in the same manner as any other game or discipline -- by arguing that by giving something up (e.g. the freedom to throw eggs at your neighbor's house) you gain something that you want (assurance that your neighbor won't put you in jail).
[9] "Sum-of-product-of-function pattern - objects are (in effect) restricted to be functions that take as first argument a distinguished method key argument that is drawn from a finite set of simple names."
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Sum-of-product-of-function pattern - objects are (in effect) restricted to be functions that take as first argument a distinguished method key argument that is drawn from a finite set of simple names.
fwiu: the "finte set of simple names" are all the objects defined in the codebase e.g. in java there are no functions as such just methods attached to classes i.e. "their key argument"
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All you can do is send a message (AYCDISAM) = Actors model - there is no direct manipulation of objects, only communication with (or invocation of) them. The presence of fields in Java violates this.
from what I understand in Java... there are some variables on classes (class instances) that are only acessible through methods and for those the "only send message" paradigm holds but there are also fields which are like attributes in python which you can change directly
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Parametric polymorphism - functions and data structures that parameterize over arbitrary values (e.g. list of anything). ML and Lisp both have this. Java doesn't quite because of its non-Object types.
generics so you've got a "template" collection e.g. Collectoin<animal> and you parametrise it with the Animal type in this example how is that broken by "non-Object types" in java</animal>
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- Mar 2018
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www.infoworld.com www.infoworld.com
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type-safe enum pattern
a.k.a. Strongly typed enum pattern
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en.wikipedia.org en.wikipedia.org
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a mutator method is a method used to control changes to a variable. They are also widely known as setter methods
For example, a method definition in Java would be:
class MyClassDef { public void setProperty(String propertyVal) { .. } }
For above, setProperty(..) method is the mutator
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- Jan 2018
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www.oracle.com www.oracle.com
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Default Value
Please note that the values listed below are the default ones. An Option can represent a Boolean toggle flag (i.e.
HeapDumpOnOutOfMemoryError
,PrintConcurrentLocks
). For such Options, '+' and '-' flags deal with Boolean toggling. In short:- '+' means Enable (or set to '1');
- '-' means Disable (or set to '0').
For example, in the table pertaining to Debugging Options, by default the
-XX:-HeapDumpOnOutOfMemoryError
is Disabled, because it has the-
prepended to it. To actually Enable it, change that with+
, yielding the variant-XX:+HeapDumpOnOutOfMemoryError
.
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- Sep 2017
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blog.vinceliu.com blog.vinceliu.com
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but the true technology of Java is not in the language, but the virtual machine itself. The JVM as it stands today, is a fast, abstract machine that you can plug any languages into, and is able to operate at speeds comparable to natively compiled binaries.
This is something really neat to ponder at... Thank you for your insight!
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- Jul 2017
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wiki.c2.com wiki.c2.com
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Other Java Tutorials and Learning Sites
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- May 2017
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stackoverflow.com stackoverflow.com
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Optimum buffer size is related to a number of things: file system block size, CPU cache size and cache latency. Most file systems are configured to use block sizes of 4096 or 8192. In theory, if you configure your buffer size so you are reading a few bytes more than the disk block, the operations with the file system can be extremely inefficient (i.e. if you configured your buffer to read 4100 bytes at a time, each read would require 2 block reads by the file system). If the blocks are already in cache, then you wind up paying the price of RAM -> L3/L2 cache latency. If you are unlucky and the blocks are not in cache yet, the you pay the price of the disk->RAM latency as well. This is why you see most buffers sized as a power of 2, and generally larger than (or equal to) the disk block size. This means that one of your stream reads could result in multiple disk block reads - but those reads will always use a full block - no wasted reads. Now, this is offset quite a bit in a typical streaming scenario because the block that is read from disk is going to still be in memory when you hit the next read (we are doing sequential reads here, after all) - so you wind up paying the RAM -> L3/L2 cache latency price on the next read, but not the disk->RAM latency. In terms of order of magnitude, disk->RAM latency is so slow that it pretty much swamps any other latency you might be dealing with. So, I suspect that if you ran a test with different cache sizes (haven't done this myself), you will probably find a big impact of cache size up to the size of the file system block. Above that, I suspect that things would level out pretty quickly. There are a ton of conditions and exceptions here - the complexities of the system are actually quite staggering (just getting a handle on L3 -> L2 cache transfers is mind bogglingly complex, and it changes with every CPU type). This leads to the 'real world' answer: If your app is like 99% out there, set the cache size to 8192 and move on (even better, choose encapsulation over performance and use BufferedInputStream to hide the details). If you are in the 1% of apps that are highly dependent on disk throughput, craft your implementation so you can swap out different disk interaction strategies, and provide the knobs and dials to allow your users to test and optimize (or come up with some self optimizing system).
What's the cache size to keep when reading from file to a buffer?
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- Apr 2017
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stackoverflow.com stackoverflow.com
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array with component type int
My only suggestion is that this should be changed to single-dimension array with component type int. As per the Encoding conventions defined by java.lang.Class#getName()'s contract.
In other other words, the OP missed the fact that for every dimension of the array-object, an [ character is prepended to the enconding of the type contained in the array.
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- Mar 2017
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Image Processing in Java
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URL
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introcs.cs.princeton.edu introcs.cs.princeton.edu
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required by Java
This should read as
required by Java's (call) stack
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- Jun 2016
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open.umn.edu open.umn.edu
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Think Java: How To Think Like a Computer Scientist
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URL
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- May 2016
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java.meritcampus.com java.meritcampus.com
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Java Programming Language was developed by James Gosling, Chris Warth, Patrick Naughton, Mike Sheridan and Ed Frank at Sun Microsystems, Inc in the year 1991. At first Java Programming Language was named as Oak, later that it was renamed to Java in the year 1995. Java Programming is a platform independent language. The Internet (World Wide Web) made Java programming more valuable. Since, Internet is connected to different types of systems which having different CPU's & environments, it must have the programs to run on any OS, CPU and Platform. Since, Java programming obtain platform independence and can able to run on any platform like Unix, Intel, Mac etc., it was widely used. Java language also protects two other major issues of Internet, they are security & portability.
Java Programming Language was developed by James Gosling, Chris Warth, Patrick Naughton, Mike Sheridan and Ed Frank at Sun Microsystems, Inc in the year 1991. At first Java Programming Language was named as Oak, later that it was renamed to Java in the year 1995.
Java Programming is a platform independent language. The Internet (World Wide Web) made Java programming more valuable. Since, Internet is connected to different types of systems which having different CPU's & environments, it must have the programs to run on any OS, CPU and Platform. Since, Java programming obtain platform independence and can able to run on any platform like Unix, Intel, Mac etc., it was widely used. Java language also protects two other major issues of Internet, they are security & portability.
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- Dec 2015
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bladejava.com bladejava.com
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blade is a web framework for rapid development of Java applications,you can be used to develop API, Web and back-end services and other applications, a RESTful framework, it provides a simple and convenient way of development, the whole operation of the micro kernel MVC bus guide frame, initial goal is to simplify the web development, and of course the author will upgrade in the future and integrate more compact components based on blade.
MVC backend java micro framework for API
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csnw.github.io csnw.github.io
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Compose complex, data-driven visualizations from reusable charts and components with d3.
wykresy i grafy w javascript
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URL
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booking.timekit.io booking.timekit.io
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booking.jsMake a beautiful embeddable booking widget in minutes.
Great google calendar conector in java script
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- Sep 2015
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tutorials.jenkov.com tutorials.jenkov.com
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MyInterfaceImpl
I believe that a better name would be
StandardOutputMyInterface
. The name of the implementation should describe the character of the implementation, which in this case is output to the standard output stream. I consider simply appendingImpl
to the interface name a (common) bad habit.
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- Jul 2015
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www.venturesity.com www.venturesity.com
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Up for a Challenge?
Do you have what it takes? Signup on www.venturesity.com and unlock opportunities.
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- Feb 2015
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docs.oracle.com docs.oracle.com
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SqlResultSetMapping
JPA SQL native query den join ile birden fazla nesne elde etme
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docs.jboss.org docs.jboss.org
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2.3.2. Mapping native queries You can also map a native query (ie a plain SQL query). To achieve that, you need to describe the SQL resultset structure using @SqlResultSetMapping (or @SqlResultSetMappings if you plan to define several resulset mappings). Like @NamedQuery, a @SqlResultSetMapping can be defined at class level or in a JPA XML file. However its scope is global to the application.
JPA SQL native query den join ile birden fazla nesne elde etme
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www.java2s.com www.java2s.com
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@SqlResultSetMappings( { @SqlResultSetMapping(name = "ProfessorWithAddress", entities = { @EntityResult(entityClass = Professor.class), @EntityResult(entityClass = Address.class) }) })
jpa birden fazla tabloyu direk sınıf ile eşleme join table mapping
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www.tinesoft.com www.tinesoft.com
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Use @FieldResult in the SqlResultSetMapping, to link each entity property to its column alias
birden fazla tablonun birleşimini sınıflara eşleştirirken oluşan hatanın giderilmesi
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- Jan 2015
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code.google.com code.google.com
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socialauth
Facebook vs sosyal login için java kütüphanesi
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URL
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javapapers.com javapapers.com
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Java Facebook Login with OAuth Authentication
Servlet ile java facebook login kodu
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porterhead.blogspot.com porterhead.blogspot.com
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Writing REST Services in Java: Part 6 Security & Authorization
rest authorization
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