28 Matching Annotations
- Feb 2021
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csawesome.runestone.academy csawesome.runestone.academy
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the same code can have different results depending on the object’s actual type at run-time.
not shown
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csawesome.runestone.academy csawesome.runestone.academy
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Programming Challenge : Shopping Cart
extraneous
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csawesome.runestone.academy csawesome.runestone.academy
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Overloading Methods
跟 “继承” 没关系， unit5 有提到
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@Override annotation
不考
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csawesome.runestone.academy csawesome.runestone.academy
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design an online store with classes
class design is not tested
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9.1.4. is-a vs. has-a (Day 2)
不重要
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csawesome.runestone.academy csawesome.runestone.academy
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public class Car extends Vehicle
FRQ 要考
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UML (Unified Modeling Language) class diagram
不用记
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csawesome.runestone.academy csawesome.runestone.academy
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You can loop through just part of a 2D array. You can change the starting value and ending value to loop through a subset of a 2D array.
非常有用
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getTotalForCol
col 不变，as a constant
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8.2.4. Enhanced For-Each Loop for 2D Arrays (Day 2)
不用学
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csawesome.runestone.academy csawesome.runestone.academy
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column-major order”
go down the column
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for (int row = 0; row < array.length; row++) { for (int col = 0; col < array[0].length; col++) {
记住，考试的时候写出来就可以得分
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csawesome.runestone.academy csawesome.runestone.academy
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Programming Challenge : ASCII Art
skip it
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csawesome.runestone.academy csawesome.runestone.academy
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The length property
shorter instruction-------- rows; longer instruction --------------x=columns;
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8.1.3. How Java Stores 2D Arrays
no need to read
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csawesome.runestone.academy csawesome.runestone.academy
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8.1.3. How Java Stores 2D Arrays
no need to read
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csawesome.runestone.academy csawesome.runestone.academy
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describes how selection sort works.
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csawesome.runestone.academy csawesome.runestone.academy
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n this Binary Search Animation to see
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csawesome.runestone.academy csawesome.runestone.academy
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write a method called numMatches()
if you see "illegal start of expression", it's probably because of missing braces in main method.
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want a nicer printout
list.size() Access value = array[index]; value = list.get(index); Modify array[index] = value; list.set(index,value);
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k++;
won't remove 2nd in 2 consecutive
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removes a name from a list.
最好用while，不用for
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- Oct 2020
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csawesome.runestone.academy csawesome.runestone.academy
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awt
Abstract Window Toolkit=AWT
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csawesome.runestone.academy csawesome.runestone.academy
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static methods
without creating an object
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java.lang package
java语言的核心
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- Sep 2020
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runestone.academy runestone.academy
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rounds up
=ROUND(3.238,2) 結果為 3.24，正常的四捨五入
=ROUNDUP(3.238,2) 結果為 3.24，不管下一位數是多少，都要進1
=ROUNDDOWN(3.238,2) 結果為 3.23
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runestone.academy runestone.academy
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divide an integer by zero
denominator
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