Save data to a File, i need help for my work please

[scb]

Hi!

have you any idea how i can save data to a file? i tryed some solutions

i.e using PrintStream out = new PrintStream( new FileOutputStream("data.txt") );

but i have this error from eclipse

Lego.java:36: cannot find symbol
symbol : class PrintStream
location: class Lego
PrintStream out = new PrintStream( new FileOutputStream("data.txt") );
^

help me please

simon

[lawrie]

Use DataOutputStream instead of PrintStream. If you need to write String data to the file, you can use the writeChars method. There are methods for writing most other primitive data types.

[scb]

thanks, using

DataOutputStream out = new DataOutputStream( new FileOutputStream("data.txt") );

I obtain

Lego.java:36: cannot find symbol
symbol : constructor FileOutputStream(java.lang.String)
location: class java.io.FileOutputStream
out = new DataOutputStream( new FileOutputStream("data.txt") );
^
1 error

how i can solve the problem?

[lawrie]

You will need to do:


File f = new File("data.txt");
f.createNewFile();
DataOutputStream out = new DataOutputStream( new FileOutputStream(f));

[scb]

thanks!!
But there is a new problem; in fact using

if(count < 10){
try {
out.writeInt(power);
out.writeChars((new Integer(power).toString()) + pid_val);
out.writeChar(';');
} catch (IOException e) {}
}
else if(count == 10){
try {
out.close();
} catch (IOException e) {}
}
count++;
}

i obtain this output file:

7 5 5 ; 7 5 5 ; 7 5 5 ; 8 5 6 ; 7 5 5 ; 9 5 7 ; @ 6 4 ; < 6 0 ; @ 6 4 ; ? 6 3 ;
mmmm
how i can print also floating point number (Double) and without spaces betwen two digit??

[scb]

i used

Code: Select all

   if(count < 10){
            try {
               // out.writeInt(power);
               StringBuffer strPid = new StringBuffer(16);
               StringBuffer strPower = new StringBuffer(8);
               strPid.append(pid_val);
               strPower.append(power);
               out.writeChars(strPower.toString()+","+ strPid.toString() + ";");
               
            } catch (IOException e) {}
         }
         else if(count == 10){
            try {
               out.close();
            } catch (IOException e) {}
         }

bye