用java制作一个小游戏 教学

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static Scanner in =new Scanner(System.in);public static int aaa(){int c = 0;while(true){try {if(c>999&&c<10000){break;}else{//System.out.println("请输入4位整数");c= in.nextInt();if(c>999&&c<10000){break;}else{System.out.println("输入有误，请重新输入4位整数");}}} catch (Exception e) {System.out.println("请输入整数");c= in.nextInt();}}//in.close();return c;}public static void cai(){//Scanner sa =new Scanner(System.in);int haoma=(int)(Math.random()*10000);if(haoma<999){haoma = Integer.parseInt(String.valueOf(haoma)+"0");}System.out.println(haoma);System.out.println("请输入一位4位整数");int aa = 0;while(true){aa= aaa();String pd=String.valueOf(aa);if(pd.length()!=4){aa = aaa();}else{break;}}while(true){if(aa==haoma){System.out.println("你猜对了，可以去买彩票了");}else{System.out.println("抱歉 ， 你猜错了");}System.out.println("是否继续1继续 其他结束");try {int ss = in.nextInt();if(ss==1){cai();}else{break;}} catch (Exception e) {in.close();break;}}}public static void main(String[] args) {System.out.println("欢迎来到猜号小游戏");cai();System.out.println("over");}