Java应用基础_GPS数据处理

package hello;

import java.util.Scanner;  

public class Demo1 {
	
  
    public static void main(String[] args) {  
       Scanner in = new Scanner(System.in);  
       String s = in.nextLine() ;
       int a  ;
       boolean ccc = false ;
       String h = null,min = null,ss = null ;
       
       for (; !s.equals("END");)
       {
    	   if (s.startsWith("$GPRMC"))
    	   {
    		   int loc = s.indexOf("*") ;
    		   String num = s.substring(loc + 1 ) ; //num为校验值
    		   s = s.substring(1, loc) ;// s为$和*之间的字符串
    		  String[] arr = s.split(",") ; //以","拆分字符串
    		  if ( arr[2].equals("A") )//进而判断是否定位
    		  {
//    			  s = s.replace(",", "") ;        
    			  //s = GPRMC,024813.640,A,3158.4608,N,11848.3737,E,10.05,324.27,150706,,,A
//    			  char[] p = s[0].toCharArray() ;
    			  a = s.charAt(0) ^ s.charAt(1) ;
    			  for (int j = 2 ; j < s.length() ; j++ )
    			  {
    				  a ^= s.charAt(j)  ;
    			  }
    			  //整个字符串进行^运算之后的a
    			  a %= 65536 ;
    			  int f = Integer.parseInt(num, 16) ;
    			  if (a == f)
    			  {
    				  ccc = true ;
    				  h = s.substring(6, 8) ;
    				  min = s.substring(8, 10) ;
    				  ss = s.substring(10, 12) ;
    			  }
    		  }
    	   }
    	   s = in.nextLine() ;
       }
       if (ccc)
       {
	    	   int q = Integer.parseInt(h) ;
	       if (q > 15 )
	       {
	    	   q = q - 15 ;
	       }
	       else
	       {
	    	   q += 8 ;
	       }
	       if (q < 10)
	       {
	    	   System.out.print("0"  );
	       }
	       System.out.print(q + ":") ;
	       int w = Integer.parseInt(min) ;
	       if (w < 10)
	       {
	    	   System.out.print("0"  );
	       }
	       System.out.print(w + ":") ;
	       int e = Integer.parseInt(ss) ;
	       if (e < 10)
	       {
	    	   System.out.print("0");
	       }
	       System.out.print( e ) ;

       }
       
    }  
  
}