随机顺序ArrayList里的元素

import java.util.ArrayList;
import java.util.Collections;

public class ShuffleElements {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    //create an ArrayList object
    ArrayList arrayList = new ArrayList();
   
    //Add elements to Arraylist
    arrayList.add("A");
    arrayList.add("B");
    arrayList.add("C");
    arrayList.add("D");
    arrayList.add("E");
   
    System.out.println("Before shuffling, ArrayList contains : " + arrayList);
   
    Collections.shuffle(arrayList);
   
    System.out.println("After shuffling, ArrayList contains : " + arrayList);
}

}

Console：
Before shuffling, ArrayList contains : [A, B, C, D, E]
After shuffling, ArrayList contains : [D, E, C, B, A]