Help,Components inside my Frame would not be displayed until maximized.

[Femi Alla]

Greetings everyone,
I have this application I developed ( the full version is in the IO section, under the topic,

I need help with seeking to abitrary positions within a text file

) but the GUI of the application has this problem I don't seem to know how to resolve. This is it; when you run this application, an empty frame is displayed. You'll then have to maximize the frame/window to see all the TextFields and TextAreas that have been added to the frame. You can then restore it to it's original size and these things still get displayed. They never get displayed unless you first maximize it. Can anyone help figure out what's wrong?
Here's the GUI part of the application and it still has this same behaviour.

import java.lang.*; 
import java.io.*; 
import java.awt.event.*; 
import java.awt.*; 
public class ReadAndCompare extends Frame implements ActionListener 
{ 
     private static Frame frame; 
     private TextField tf1; 
     private TextField tf2; 
     private TextArea ta; 
     private static Panel p; 
     private Label l1; 
     private Label l2; 
     private Label l3; 
     private Button b; 
     private ScrollPane scrollpane;
    ReadAndCompare() 
   { 
        super("An application that compares the contents of two text files."); 
       l1 = new Label("Enter the name of the first file here:"); 
       l2 = new Label("Enter the name of the second file here:"); 
       l3 = new Label ("This is the result of the comparison:"); 
       tf1 = new TextField(20); 
       tf1.addActionListener(this); 
       tf2 = new TextField(20); 
       tf2.addActionListener(this); 
       scrollpane = new ScrollPane();
       ta = new TextArea(); 
       scrollpane.add(ta);
       b = new Button(" OK "); 
       b.addActionListener(this); 
       p = new Panel(); 
       p.add(l1); 
       p.add(tf1); 
       p.add(l2); 
       p.add(tf2); 
       p.add(l3); 
       p.add(ta); 
       p.add(b); 

       setVisible(true); 
        setSize(450,450); 
} 
  public static void main(String agrs[]) 
  { 
        frame = new ReadAndCompare(); 
        frame.add(p); 
   } 
  public void actionPerformed(ActionEvent e) 
  { 
       if (e.getSource()== b); 
      //
   }
}

[jrookie]

hi
try use pack() method

[Nathan Pruett]

"jrookie" -

Welcome to the JavaRanch! Please adjust your displayed name to meet the
JavaRanch Naming Policy.
You can change it here.

Thanks! and welcome to the JavaRanch!

[Nathan Pruett]

Femi,

Your problem is in the following code:

public static void main(String agrs[]){
    frame = new ReadAndCompare();
    frame.add(p);
} 

Remove frame.add(p); from this location and put add( p ); in your constructor. You are setting up the panel and setting the frame's size and making the frame visible in with the constructor, then you add the panel to the frame... this is out of order...

[Femi Alla]

Thank you very much.

[Femi Alla]

I see the logic in your explanation. I did just that but problem still persists. Could you please take a closer look?

[Paul Stevens]

Change the display part to look like this:

        p.add(b); 
         
        add(p); 
        
        setSize(450,450);
        show();  
              
        
        //setVisible(true);         
         }   
        
        public static void main(String agrs[])   {     
            frame = new ReadAndCompare(); 
                  
        }   

It is moving the add like Nathan said and replacing the setVisible with show.

[Femi Alla]

Thanks a lot Paul, but then I still would like to know why I should use show() and not setvisible. Are there any advantages?
Again, thanks.

[Femi Alla]

Thanks a lot Paul, but then I still would like to know why I should use show() and not setvisible. Are there any advantages?
Again, thanks.