修改后的抽奖系统

package p1;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;
public class choujiang {
	ArrayList<Integer> values;
	public ArrayList<Integer> deal(){
		if(values==null){
			values=new ArrayList<Integer>();
			for(int i=1;i<=2000;i++){
				values.add(i);
			}
		}
		Collections.shuffle(values);
		return values;		
	}
	public void display(){
		String[] player ={"一等奖","二等奖","三等奖"};
		for(int i=0;i<3;i++){ 
			System.out.print(player[i]+":");
			for(int j=0;j<=i;j++){
				Random r=new Random();
		        int number =r.nextInt(2000)+1;
				System.out.print(values.get(number)+"号      ");
				values.remove(number);
			    } 
			System.out.println();
		}
		
	}
	public static void main(String[] args) {
		choujiang c=new choujiang();
		c.deal();
		c.display();
	}

}

期末设计