CODEWITHSUNDEEP
javafile-io
Strammefar
Strammefar

Reputation: 57

Simple PrintToFile program

I'm trying to write a simple java program in Eclipse that prints these four lines into a file "hello.txt". THe problem is, that nothing is happening, it doesn't create a new file, and if i make a file called "hello.txt" the program doesn't overwrite it. What am I doing wrong? Thanks for your answers. :)

import java.io.*;

public class output {
    {
        try{
            PrintStream output = new PrintStream(new File("hello.txt"));
            output.println("Hello World!");
            output.println("this is ");
            output.println("four lines of");
            output.println("text.");
        }catch(FileNotFoundException e){
            System.out.println("Cannot write file!");
        }
    }
}

Upvotes: 0

Views: 583

Answers (7)

Jwalin Shah
Jwalin Shah

Reputation: 2521

you need to write output.close();

Upvotes: 0

v01d
v01d

Reputation: 1507

The right way to do it is like this 

import java.io.*;
class PrintStreamDemo {  
    public static void main(String args[]){ 
        FileOutputStream out; 
        PrintStream ps; // declare a print stream object

        try {
            // Create a new file output stream
            out = new FileOutputStream("myfile.txt");

            // Connect print stream to the output stream
            ps = new PrintStream(out);

            ps.println ("This data is written to a file:");
            System.err.println ("Write successfully");

            ps.close();
        } catch (Exception e){
            System.err.println ("Error in writing to file");
        }
    }
}

Upvotes: 0

Tomek
Tomek

Reputation: 11

output.close();

or 

output.flush();

If you don't close your streams, they won't be saved to disk.

Upvotes: 1

user1065604
user1065604

Reputation:

At first you have to create your file if it is not there. With that you create the PrintStream-Object and write the content you like in it. Finally don't forget to flush and close the stream.

 try{
 File f = new File("C:/hello.txt");
 if (!f.exists()){
    f.createNewFile();
 }
 PrintStream output = new PrintStream(f);
 output.println("Hello World!");
 output.println("this is ");
 output.println("four lines of");
 output.println("text.");
 output.flush();
 output.close();
}catch(FileNotFoundException e){
  System.out.println("Fil kan ikke skrives!");
} catch (IOException e) {
  e.printStackTrace();
}

Upvotes: 0

Giovanni
Giovanni

Reputation: 4015

I just run your code on windows putting it in main method and it works (it creates the file). try with an absolute path, perhaps you are checking the wrong directory. You also should call

output.close();

Upvotes: 0

Chris
Chris

Reputation: 23171

There are a few problems here:

  1. you need to close your output stream when you're done with output.close();
  2. Your class needs a main method void main(String[] args that calls the output routine
  3. The output routine needs to be enclosed in a method

Upvotes: 2

erimerturk
erimerturk

Reputation: 4288

you should add output.close();

try{
            PrintStream output = new PrintStream(new File("hello.txt"));
            output.println("Hello World!");
            output.println("this is ");
            output.println("four lines of");
            output.println("text.");
            output.close();
        }catch(FileNotFoundException e){
            System.out.println("Cannot write file!");
        }

Upvotes: 0

Related Questions