java list 交换_交换ArrayList里的元素

import java.util.ArrayList;

import java.util.Collections;

public class SwapElements {

public static void main(String[] args) {

// TODO Auto-generated method stub

ArrayList arrayList = new ArrayList();

arrayList.add("A");

arrayList.add("B");

arrayList.add("C");

arrayList.add("D");

arrayList.add("E");

System.out.println("Before swaping, ArrayList contains : " + arrayList);

Collections.swap(arrayList,0,4);

System.out.println("After swaping, ArrayList contains : " + arrayList);

}

}

Console：

Before swaping, ArrayList contains : [A, B, C, D, E]

After swaping, ArrayList contains : [E, B, C, D, A]