CODEWITHSUNDEEP
javajframejpanel
volican
volican

Reputation: 137

Add a component to a panel through a class?

I setup a panel through a class and would like to be able to add components to the panel within the actual class. For simplification, in the following code I am just trying to add a label. The following is what I have so far, it doesn't like me using this though.

package testframe2;

import java.awt.Color;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;


public class TestFrame2 {

    public static void main(String[] args) {
        new TestFrame2();
    }

    public TestFrame2() {


        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");

                frame.setUndecorated(true);
                frame.setAlwaysOnTop(true);               
                frame.setBackground(new Color(0, 0, 0, 0));
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);                                               
                frame.add(new TestPane());                                              
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);

            }
        });

    }

    public class TestPane extends JPanel {

        private JLabel label = new JLabel("hello world");
        this.add(label);       

        }

}

Upvotes: 0

Views: 75

Answers (3)

Dragos
Dragos

Reputation: 776

Try this. I did not try to build it, you may still have some more errors.

package testframe2;

import java.awt.Color;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;


public class TestFrame2 {

public static void main(String[] args) {
    new TestFrame2();
}

public TestFrame2() {


    EventQueue.invokeLater(new Runnable() {
        @Override
        public void run() {
            try {
                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                ex.printStackTrace();
            }

            JFrame frame = new JFrame("Testing");

            frame.setUndecorated(true);
            frame.setAlwaysOnTop(true);               
            frame.setBackground(new Color(0, 0, 0, 0));
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);                                               
            frame.getContentPane().add(new TestPane());                                              
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);

        }
    });

}

public class TestPane extends JPanel {

    private JLabel label = new JLabel("hello world");

    public TestPane() {
        super();
        this.add(label);
    }
}
}

Upvotes: 0

ArcticLord
ArcticLord

Reputation: 4039

Of course you can do this. But write correct Java! Extend your TestPane from JPanel and then create and add your components to your custom Panel in the constuctor.

public class TestPane extends JPanel {
    private JLabel label;
        public TestPane(){          
            super();
            label = new JLabel("hello world");
            add(label);
        }    
    }
}

Upvotes: 0

Ramanlfc
Ramanlfc

Reputation: 8354

public class TestPane extends JPanel {

     private JLabel label = new JLabel("hello world");
      this.add(label);       

}

this is invalid syntax , put this.add(label); in a method(or TestPane constructor)

Upvotes: 1

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