java简单问题，请大家解答

import java.util.Scanner;
public class helloworld{
    public static void main(String[] args){
        Scanner myScanner=new Scanner(System.in);
        String s=myScanner.next();
        int sum=0;
        //.lastIndexOf()指定字符串最后出现的索引值
        //String[] split=s.split(".")根据字符进行分割字符串
        //indexOf  返回第一次出现的索引
        for(int i=s.lastIndexOf('＄')+1;i<s.indexOf('*');i++){
            sum^=s.charAt(i);

        }
        int num=(int)sum%65536;
       int num2=Integer.parseInt(s.substring(s.indexOf('*')+1,16));



        //}
        String[] s1=s.split(",");
        if(num==num2){
            int num3=Integer.parseInt(s1[1])%24;
            int num4=Integer.parseInt(s1[1])%1440;
            int num5=Integer.parseInt(s1[1])%86400;
            if(num3<10)
             System.out.print("0"+num3+":");
            else
                System.out.print(num3+":");

            if(num4<10)
                System.out.print("0"+num4+":");
            else
                System.out.print(num4+":");

            if(num5<10)
                System.out.print("0"+num5);
            else
                System.out.print(num5);
    }
}
}