I/O File problem..

[withu4ever]

hi all,
I'm using Java input /out files
I'm reading from a txt file which holds intger
and I would like to sum them and put the result in a new txt file holds the output as an integer but it holds un-understandable thing such as ( )

this is the source code , it's compiled,

package filetest2;
import java.util.Scanner;
import java.io.*;


class fileTest2  {
    public static void main(String [] args) throws Exception{ 

        FileInputStream a1 = new FileInputStream("input.txt") ;
        DataInputStream a2 = new DataInputStream(a1) ;
        
        FileOutputStream a3 = new FileOutputStream("out.txt");
        DataOutputStream a4 = new DataOutputStream(a3);
        
        Scanner scan = new Scanner (a1);
         int sum1 = 0;
              
        int numOfLines = scan.nextInt();
            for (int i= numOfLines;i>0;i--)
            {  int numOfTests = scan.nextInt();
                    for (int j = numOfTests;j>0;j--)
                       sum1 =+  scan.nextInt();
              
            }
        
            a4.write(sum1);
            
            a3.close();
            a1.close();
        
        }
}

Waiting for your respone..

[JosAH]

It's perfectly understandable if you can read binary data. You're mixing up too
many streams:

- get rid of stream a2, you're not using it.
- make a4 a PrintStream and make it println(sum), not write(sum) it.
- read the API docs for those streams.

kind regards,

Jos

[sukatoa]

hi all,
I'm using Java input /out files
I'm reading from a txt file which holds intger
and I would like to sum them and put the result in a new txt file holds the output as an integer but it holds un-understandable thing such as ( )

this is the source code , it's compiled,

package filetest2;
import java.util.Scanner;
import java.io.*;


class fileTest2  {
    public static void main(String [] args) throws Exception{ 

        FileInputStream a1 = new FileInputStream("input.txt") ;
        DataInputStream a2 = new DataInputStream(a1) ;
        
        FileOutputStream a3 = new FileOutputStream("out.txt");
        DataOutputStream a4 = new DataOutputStream(a3);
        
        Scanner scan = new Scanner (a1);
         int sum1 = 0;
              
        int numOfLines = scan.nextInt();
            for (int i= numOfLines;i>0;i--)
            {  int numOfTests = scan.nextInt();
                    for (int j = numOfTests;j>0;j--)
                       sum1 =+  scan.nextInt();
              
            }
        
            a4.write(sum1);
            
            a3.close();
            a1.close();
        
        }
}

Waiting for your respone..

At first, you have reversed the shorthand arithmetic operator (+=)....
@ sum1 =+ scan.nextInt();

If you like to have an experiment on capturing values in text file...
You can also use Scanner class...

Update us,
sukatoa

[withu4ever]

Thanks for ur respond,
I'll try it now again :)

[withu4ever]

It's perfectly understandable if you can read binary data. You're mixing up too
many streams:

- get rid of stream a2, you're not using it.
- make a4 a PrintStream and make it println(sum), not write(sum) it.
- read the API docs for those streams.

kind regards,

Jos

I made what you have said,
It WORKS :D :D :D
Thanks a Lot