Question

I made a program to produce a file with numbers in it
But the program is not typing any thing in the file it created!

This is the code:

     private void OpenMenuActionPerformed(java.awt.event.ActionEvent evt) {                                         
    ModFile=new File(NameText.getText() + ".mod");
    FileWriter writer = null;
    try {
        writer = new FileWriter(ModFile);
    } catch (IOException ex) {
        Logger.getLogger(ModMakerGui.class.getName()).log(Level.SEVERE, null, ex);
    }
   if(!ModFile.exists()){
   try {
   ModFile.createNewFile();
   System.out.println("Mod file has been created to the current directory");
   writer.write(CodesBox.getText());
   } catch (IOException ex) {
   Logger.getLogger(ModMakerGui.class.getName()).log(Level.SEVERE, null, ex);
       }
     }     
   }                      

When i create a random file, i don’t see any thing when i open it!
Please help
Thanks Amir for helping but i noticed i should use FileOutputStream and DataOutputStream…
So, i need help again cause the same problem appeared 🙁

 File ModFile =new File(NameText.getText() + ".mod");
try {
    FileOutputStream fos = new FileOutputStream(ModFile);
    DataOutputStream dos = new DataOutputStream(fos);
    int i = Integer.parseInt(CodesBox.getText());
    dos.writeInt(i);
        // and other processing 
} catch (IOException ex) {
    Logger.getLogger(ModMakerGui.class.getName()).log(Level.SEVERE, null, ex);
}finally{
    try{
         dos.close();
    } catch(IOException e) {
        e.printStackTrace();
    }
}

NetBeans said they cannot find the symbol dos at (dos.close();)

Please help me here again

Answer 1

• You have to check that file name is present in NameText.getText().
• You dont need to create file, if file dont exist FileWriter will create it self.

• You should Close file after processing

  private void OpenMenuActionPerformed(java.awt.event.ActionEvent evt) {

      //check before file name is nt null
      File ModFile =new File("somefile" + ".mod");
      FileWriter writer = null;
  
      try {
          writer = new FileWriter(ModFile);
          writer.write("test..................");
              // and other processing 
      } catch (IOException ex) {
          Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
      }finally{
          try {
              writer.close();
          } catch (IOException e) {
              e.printStackTrace();
          }
      }
  
  }                    
  

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
to use FileOutputStream and write byte array follow the following code

private static void OpenMenuActionPerformed(java.awt.event.ActionEvent evt) {  

//check before file name is nt null
    File ModFile =new File("somefile" + ".mod");
    FileOutputStream writer = null;

    String toProcess = "00D0C0DE00D0C0DE F000000000000000";

    try {
        writer = new FileOutputStream(ModFile);
        writer.write(toProcess.getBytes(),0,toProcess.getBytes().length);

    } catch (IOException ex) {
        Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
    }finally{
        try {
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}