Java Examples - Shuffle Collection Order
Java ExamplesThe following example demonstrates how to use the Collections.shuffle() method of the Collections class to shuffle the order of elements in a collection:
Main.java file
import java.util.*;
public class Main {
public static void main(String[] args) {
List<Integer> list = new ArrayList<Integer>();
for (int i = 0; i < 10; i++)
list.add(new Integer(i));
System.out.println("Before shuffling:");
System.out.println(list);
for (int i = 1; i < 6; i++) {
System.out.println("No." + i + "After shuffling:");
Collections.shuffle(list);
System.out.println(list);
}
}
}
The output of running the above code is:
打乱前: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] 第1次打乱： [2, 0, 5, 1, 4, 9, 7, 6, 3, 8] 第2次打乱： [2, 6, 4, 8, 5, 7, 9, 1, 0, 3] 第3次打乱： [6, 5, 1, 0, 3, 7, 2, 4, 9, 8] 第4次打乱： [1, 3, 8, 4, 7, 2, 0, 6, 5, 9] 第5次打乱： [3, 0, 7, 9, 5, 8, 4, 2, 1, 6]Other extensions