简单的抽奖活动的JAVA代码

import java.util.Random;
import java.util.Scanner;

public class ChouJian {
	final static int num = 4;
	
	public static void main(String[] args) {
		boolean flag = true;
		Scanner sc = new Scanner(System.in);
		int choice = 0;
		do{
			System.out.println("==========================");
			System.out.println("\t1.开始抽奖");
			System.out.println("\t0.退出系统");
			System.out.println("==========================");
			System.out.println("请输入您的选项:");
			choice = sc.nextInt();
			switch (choice) {
			case 1:
				Chou();
				break;
			case 0:
				System.exit(0);
				break;

			default:
				System.out.println("参数错误！！！");
				break;
			}
		}while(flag);
	}
	
	public static void Chou(){
		Random rd = new Random();
		String str = "";
		for(int i=0;i<4;i++){
			String s = rd.nextInt(2)+"";
			str = str + randomSelect(s);
		}
		System.out.println("您抽奖的号码为"+str);
		System.out.println("抽奖结果为："+drawLottery(str));
	}

	//奖项
	private static String drawLottery(String str) {
		if(str.equals("★★★★")){
			return "一等奖";
		}else if(str.equals("★★★☆")){
			return "二等奖";
		}else if(str.equals("★★☆☆")){
			return "三等奖";
		}else {
			return "谢谢参与!!!";
		}
	}

	
	private static String randomSelect(String s) {
		if(s.equals("1")){
			return "★";
		}else{
			return "☆";			
		}
	}
}