16 Matching Annotations
  1. Jul 2021
    1. 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.
    2. 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).

  2. Jun 2021
  3. May 2020
    1. 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
  4. Jan 2019
    1. after the terminal operation of the stream pipeline commences.

      Above is because of the nature of Streams in general: they are lazily executed (or put another way, execution is delayed until the latest convenient method call).

  5. Dec 2018
    1. 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

  6. Oct 2018
    1. 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."

    2. 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"

    3. 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

    4. 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>

  7. Mar 2018
    1. 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

  8. Sep 2017
    1. 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!

  9. Jul 2017
  10. May 2016
    1. 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.

  11. Jul 2015