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

}

}