JPanel

[julian farmer]

How do I make a JPanel visible in a JFrame? Here is code:

aimTrainerB.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        
        aimTrainer aimTrainerW = new aimTrainer();
        win.add(aimTrainerW);
      }
    });



public class aimTrainer extends JPanel {

   
    
    public aimTrainer() {
        super();
     
        JPanel panel = new JPanel();
        panel.setBounds(0, 0, 825, 825);
        panel.setBackground(Color.GRAY);
        panel.setOpaque(false);
    
        panel.setVisible(true);

    }
}

I am trying to add a second JPanel

Thank you!

[Carey Brown]

You have to create a JFrame and then add the JPanel to the JFrame then setVisible(true) on only the JFrame.

[Campbell Ritchie]

Welcome to the Ranch

Why are you repeatedly adding panels to whatever you are adding them to (line 5)?
Are you using a Window or JWindow? Use a JFrame instead.
Always start class names with CapitalLetters. Variable names like aimTrainerB and aimTrainerW are difficult to understand.

[Carey Brown]

import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class SwingFrameAndPanel
{
	public static void main( String[] args )
	{
		JFrame		frame = new JFrame();
		frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
		
		JPanel		panel = new JPanel();
		panel.setBackground( Color.red );
		
		frame.add( panel );
		frame.setSize( 400, 400 );
		frame.setVisible( true );
	}
}

[Carey Brown]

or...extending a JPanel

import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class SwingFrameAndExtendedPanel
{
	public static void main( String[] args )
	{
		JFrame		frame = new JFrame();
		frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
		
		ExtendedPanel	panel = new ExtendedPanel();
		
		frame.add( panel );
		frame.setSize( 400, 400 );
		frame.setVisible( true );
	}
}

class ExtendedPanel
extends JPanel
{
	public ExtendedPanel()
	{
		setBackground( Color.gray );
	}
}

[Norm Radder]

The JPanel created on line 18 is never added to any container.  I assume it will disappear shortly after the constructor exits.