java语言实现猜数字游戏

import java.util.Random;
import java.util.Scanner;
public class GuessNumber1{
 public static Scanner scanner = new Scanner(System.in);//输入
 public static Random rnd = new Random();//产生随机数
 public static void meau(){
 System.out.println(" *****欢迎进入猜数字游戏***** ");
 System.out.println(" 1:play----------0:exit  ");
 System.out.println("********************************");
 }
 public static void userplay(){
 while(true){ 
 meau();
 System.out.print("请输入你的选择:");
  int sc = scanner.nextInt();
 switch(sc){
 case 1:{
  play();
  break;
 }
 case 0:{
  return;
 }
 default:{
  System.out.println("输入错误");
  break;
 }
 } 
 }
}
 public static void play(){
 int random = rnd.nextInt(100);
 while(true){
 System.out.print("请输入你猜想的数字:");
 int sc = scanner.nextInt();
 if (sc<random){
  System.out.println("猜小了");
 }else if (sc>random){
  System.out.println("猜大了");
 }else{
 System.out.println("猜对了");
  break;
 } 
 }
}
 public static void main(String[] args){
 userplay();
 }  
}