Question

java中collections类的shuffle方法是怎么实现的

Answer 1

// ShuffleTest.java

import java.util.*;

public class ShuffleTest {
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("打乱前:");
System.out.println(list);

for (int i = 0; i < 5; i++) {
System.out.println("第" + i + "次打乱：");
Collections.shuffle(list);
System.out.println(list);
}
}
}