java第六次作业（老师讲过后）

import java.util.*;

public class Draw {
private ArrayList list;
public Draw() {
list= new ArrayList();
}
public void deal(int num) {
//向容器中添加奖券（使用循环）

		for (int j = 0; j<= num ; j++) {
			 list.add(j);
		
	}
	//打乱顺序
	Collections.shuffle( list);
}
public void drawLottery(int n){
  Random ra = new Random();
	
  for(int i=0;i<n;i++){
  int index =ra.nextInt(list.size());
  System.out.print(list.get(index)+"\t");
  list.remove(index);
  }
  System.out.println();
  }
public static void main(String[] args) {
	// TODO Auto-generated method stub
	Draw c = new Draw();
	
	c.deal(100);
	System.out.println("————————一等奖————————");
	c.drawLottery(2);
	System.out.println("————————二等奖————————");
	c.drawLottery(5);
	System.out.println("————————三等奖————————");
	c.drawLottery(10);
}

}