第六次作业

package choujiang;

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

public class choujiang {
ArrayList number;

public static void main(String[] args) {
	// TODO Auto-generated method stub

choujiang cj = new choujiang();
cj.deal();
cj.action();

}
public void deal(){
	if(number==null){
		number = new ArrayList<Integer>();
		for(int i=1;i<=100;i++){
			number.add(i);
			
		}
	}
	Collections.shuffle(number);
}
public void action(){
	Random r = new Random();
	//一等奖
	int index =r.nextInt(number.size());
	System.out.println("一等奖:"+number.get(index));
	number.remove(index);
	Collections.shuffle(number);
	//二等奖
	for(int i=0;i<2;i++){
		int indextwo = r.nextInt(number.size());
		System.out.println("二等奖:"+number.get(indextwo));	
		number.remove(indextwo);
	}
	Collections.shuffle(number);
	//三等奖
	for(int i=0;i<3;i++){
		int indexthree = r.nextInt(number.size());
		System.out.println("三等奖:"+number.get(indexthree));
	}
	
}

}

运行出来的结果如下图：

出来的都是随机结果