import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;
public class CHOUJIANG { private ArrayList<Integer> list;
public CHOUJIANG(){ list = new ArrayList<Integer>(); }
public void deal (int num){
//向容器中添加奖券(使用循环)
for (int i=1;i<num;i++){ list.add(i); }
//打乱顺序
Collections.shuffle(list);
}
public void drawLottery(int n){
//产生n个指定范围(0~list.size())的随机表
Random rd = new Random();
int []Lost =new int[n];
for (int i = 0;i< n;i++){ int index = rd.nextInt(list.size());
/*
* 获得容器中以产生的随机数为下表的元素的内容.
* 即为获奖的奖券的抽奖号,输出
*/
System.out.print(list.get(index)+" ");
//将已获奖的元素(奖券)从容器中删除
list.remove(index); }
System.out.println(); }
public static void main(String[] args) {
// TODO Auto-generated method stub
CHOUJIANG dr = new CHOUJIANG();
dr.deal(2000);
System.out .println("-----一等奖-----");
dr.drawLottery(3);
System.out .println("-----二等奖-----");
dr.drawLottery(10);
System.out .println("-----三等奖-----");
dr.drawLottery(20); }
}