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Java GUI problem... contents of JFrame is invisible...

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Join Date: Sep 2004

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apcxpc

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Java GUI problem... contents of JFrame is invisible...

Jun 12th, 2005

Hi all...

I have a JFrame, which contains a JTabbed Pane, which contains two JPanels.

The problem is that when I run the program, a completely grey frame shows up, and the contents only becomes visible when I click on the border of the frame.

Here is the code. Compile & run to see what I mean. I already tried repainting the contents of the frame in the main program, didn't work.

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTabbedPane;
 
public class test{
 
	JFrame mainFrame;
	JTabbedPane JTP;
	JPanel panel1, panel2;
	JSlider JS;	
 
	public test(){
 
		mainFrame = new JFrame();
 
		panel1 = new JPanel();
		panel1.setBackground(Color.black);
		panel1.setForeground(Color.white);
 
		JS = new JSlider();
		JS.setForeground(Color.white);
		JS.setMinimum(0);
		JS.setMaximum(100);
		JS.setMinorTickSpacing(5);
		JS.setMajorTickSpacing(10);
 
		JS.setPaintTicks(true);
		JS.setPaintLabels(true);
 
		panel2 = new JPanel();
		panel2.setBackground(Color.black);
		panel2.setForeground(Color.white);
		panel2.setLayout(new BorderLayout());
		panel2.add(JS, BorderLayout.CENTER);
 
		JTP = new JTabbedPane();
		JTP.add("Tab1", panel1);
		JTP.add("Tab2", panel2);
		JTP.setForeground(Color.green);
		mainFrame.getContentPane().add(JTP);
		mainFrame.setVisible(true);
		mainFrame.setTitle("Test");
		mainFrame.setSize(400,400);
	}
 
	public static void main(String[] args){
		test T = new test();
		T.mainFrame.repaint();
		T.panel1.repaint();
 
	}
 
}
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTabbedPane;

public class test{
	
	JFrame mainFrame;
	JTabbedPane JTP;
	JPanel panel1, panel2;
	JSlider JS;	
	
	public test(){
		
		mainFrame = new JFrame();
		
		panel1 = new JPanel();
		panel1.setBackground(Color.black);
		panel1.setForeground(Color.white);
				
		JS = new JSlider();
		JS.setForeground(Color.white);
		JS.setMinimum(0);
		JS.setMaximum(100);
		JS.setMinorTickSpacing(5);
		JS.setMajorTickSpacing(10);
				
		JS.setPaintTicks(true);
		JS.setPaintLabels(true);
		
		panel2 = new JPanel();
		panel2.setBackground(Color.black);
		panel2.setForeground(Color.white);
		panel2.setLayout(new BorderLayout());
		panel2.add(JS, BorderLayout.CENTER);
				
		JTP = new JTabbedPane();
		JTP.add("Tab1", panel1);
		JTP.add("Tab2", panel2);
		JTP.setForeground(Color.green);
		mainFrame.getContentPane().add(JTP);
		mainFrame.setVisible(true);
		mainFrame.setTitle("Test");
		mainFrame.setSize(400,400);
	}
	
	public static void main(String[] args){
		test T = new test();
		T.mainFrame.repaint();
		T.panel1.repaint();
		
	}
		
}

Any help would be much appreciated.

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Join Date: Aug 2004

Posts: 350

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Ghost

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Posting Whiz

Re: Java GUI problem... contents of JFrame is invisible...

Jun 12th, 2005

i'm not sure, but i think you need to write setContentPane(container);

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Join Date: Sep 2004

Posts: 55

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apcxpc

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Re: Java GUI problem... contents of JFrame is invisible...

Jun 12th, 2005

... explain plz.

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Postaholic

Re: Java GUI problem... contents of JFrame is invisible...

Jun 12th, 2005

There was a few problems. I've got a working version below that you can look at. If you have an older version of java it may not run correctly. Now, you'll have to extend JFrame to get some of the methods I'm using, which I prefer to extend JFrame anyways.

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
import java.awt.*;
import javax.swing.*;
 
public class test extends JFrame{
 
	JTabbedPane JTP;
	JPanel panel1, panel2;
	JSlider JS;	
 
	public test(){
 
		panel1 = new JPanel();
		panel1.setBackground(Color.black);
		panel1.setForeground(Color.white);
 
		JS = new JSlider();
		JS.setForeground(Color.white);
		JS.setMinimum(0);
		JS.setMaximum(100);
		JS.setMinorTickSpacing(5);
		JS.setMajorTickSpacing(10);
 
		JS.setPaintTicks(true);
		JS.setPaintLabels(true);
 
		panel2 = new JPanel();
		panel2.setBackground(Color.black);
		panel2.setForeground(Color.white);
		panel2.setLayout(new BorderLayout());
		panel2.add(JS, BorderLayout.CENTER);
 
		JTP = new JTabbedPane();
		JTP.add("Tab1", panel1);
		JTP.add("Tab2", panel2);
		JTP.setForeground(Color.green);
 
		Container content = getContentPane();
		content.add(JTP);
		setContentPane(content);
		setTitle("Test");
		setSize(400,400);
		setVisible(true);
	}
 
	public static void main(String[] args){
		test T = new test();
 
	}
 
}
import java.awt.*;
import javax.swing.*;

public class test extends JFrame{

	JTabbedPane JTP;
	JPanel panel1, panel2;
	JSlider JS;	
	
	public test(){
		
		panel1 = new JPanel();
		panel1.setBackground(Color.black);
		panel1.setForeground(Color.white);
				
		JS = new JSlider();
		JS.setForeground(Color.white);
		JS.setMinimum(0);
		JS.setMaximum(100);
		JS.setMinorTickSpacing(5);
		JS.setMajorTickSpacing(10);
				
		JS.setPaintTicks(true);
		JS.setPaintLabels(true);
		
		panel2 = new JPanel();
		panel2.setBackground(Color.black);
		panel2.setForeground(Color.white);
		panel2.setLayout(new BorderLayout());
		panel2.add(JS, BorderLayout.CENTER);
				
		JTP = new JTabbedPane();
		JTP.add("Tab1", panel1);
		JTP.add("Tab2", panel2);
		JTP.setForeground(Color.green);
		
		Container content = getContentPane();
		content.add(JTP);
		setContentPane(content);
		setTitle("Test");
		setSize(400,400);
		setVisible(true);
	}
	
	public static void main(String[] args){
		test T = new test();
		
	}
		
}