Java shuffle混排方法

shuffle混排方法

與sort()排序方法相反，Collections.shuffle()方法用來隨機打亂集合中元素的順序。

代碼如下

import java.util.ArrayList;

import java.util.Collections;

import java.util.Iterator;

import java.util.List;

import java.util.TreeMap;

//shuffle()排序方法

public class ShufflingCollection {

public static void main(String[] args) {

List<Double> list = new ArrayList<>(); 

double array[] = {3, 101,345,987, 1}; 

System.out.println("混排前數(shù)字集合順序為：");

for (int i = 0; i < array.length; i++) {

list.add(new Double(array[i]));

System.out.println(list.get(i));

}

Collections.shuffle(list);

System.out.println("混排后數(shù)字集合順序為："); 

for (int i = 0; i < array.length; i++) {

System.out.println(list.get(i));

}

}

}