Collections.shuffle()方法的使用

Collections.shuffle()的作用是对集合进行重新打乱(随机排序)。

package hdp;
import java.util.*;  
public class Test {  
    public static void main(String[] args) {  
        List list = new ArrayList();  
        for (int i = 0; i < 10; i++) { 
            list.add(new Integer(i));  
        }
        System.out.println("打乱前:"+list);   
        for (int i = 0; i < 5; i++) {  
            Collections.shuffle(list);  
            System.out.println("第" + i + "次打乱："+list); 
        }  
    }  
}