javar日志

Java日志
第六篇
抽奖
package choujiang;

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

public class lotterDraw {

public static void main(String[] args) {
	ArrayList <Integer> number = new ArrayList<>();
	Random random = new Random();
	
	for (int i=0;i<1000;i++){
		int a=i;
		number.add(a);
	}
	Collections.shuffle(number);
	int a =random.nextInt(1000);
	System.out.println("一等奖"+number.get(a)+"\n");
	number.remove(a);
	for(int i=1;i<=2;i++){
		Collections.shuffle(number);
		int b =random.nextInt(999-i);
		System.out.println("二等奖"+number.get(b)+"\n");
		number.remove(b);
	}
	for(int i=1;i<=3;i++){
		Collections.shuffle(number);
		int  c=random.nextInt(997-i);
		System.out.println("三等奖"+number.get(c)+"\n");
	}
	// TODO Auto-generated method stub

}

}