Created
October 7, 2017 23:55
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import java.util.ArrayList; | |
class ArrayListDemo1 { | |
public static void main(String[] args) { | |
//1. addしてみる | |
ArrayList<Integer> array = new ArrayList<>(); | |
System.out.println("==========="); | |
System.out.println("Before add"); | |
System.out.println("==========="); | |
System.out.println("array size : " + array.size()); | |
array.add(10); | |
array.add(20); | |
array.add(30); | |
array.add(40); | |
array.add(50); | |
array.add(60); | |
System.out.println("==========="); | |
System.out.println("After add"); | |
System.out.println("==========="); | |
System.out.println("array size : " + array.size()); | |
System.out.print("array elements :"); | |
showElements(array); | |
System.out.println(""); | |
//2. index指定でaddしてみる | |
System.out.println("==========="); | |
System.out.println("After add(i,e)"); | |
System.out.println("==========="); | |
array.add(0,1); | |
System.out.println("array size : " + array.size()); | |
System.out.print("array elements :"); | |
showElements(array); | |
System.out.println(""); | |
//3. setで置換してみる | |
System.out.println("==========="); | |
System.out.println("After set()"); | |
System.out.println("==========="); | |
array.set(6,6); | |
System.out.println("array size : " + array.size()); | |
System.out.print("array elements :"); | |
showElements(array); | |
System.out.println(""); | |
} | |
static void showElements(ArrayList a) { | |
System.out.print("[ "); | |
for(int i = 0; i < a.size(); i++) { | |
System.out.print(a.get(i) + " "); | |
} | |
System.out.print("]"); | |
} | |
} |
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static ArrayList<Integer> S = new ArrayList<Integer>(10); S.add(index,element);