Adding JPanel from another class to JPanel in JFrame

Question

I can\'t get my JFrame from main class to display JPanel from another class. Everything compiles without errors.

JFrameTest.java:

pa         


        

Answer 1

With some more help (user "Hilek" from some other site) I menaged to get the JPanel from another class to be displeyed in main class. Here is the code:

JFrameTest.java:

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

public class JFrameTest extends JFrame {

        private JButton testButton;
        private JPanel panelMain;
        private JPanelOne panel;

        public JFrameTest() {

                // setting up JFrame
                setLayout(null);
                setPreferredSize(new Dimension(420, 90));
                setResizable(false);
                setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                // creating main JPanel (white)
                panelMain = new JPanel();
                panelMain.setBackground(Color.WHITE);
                panelMain.setBounds(0, 0, 420, 90);
                panelMain.setPreferredSize(new Dimension(200, 40));
                add(panelMain);

                // creating JButton in the main JPanel (white)
                testButton = new JButton("Button from main class");
                panelMain.add(testButton);

                // creating new JPanelOne object from JPanelOne class containing black JPanel
                panel = new JPanelOne();

                // adding black JPanel to main JPanel (white)
                panelMain.add(panel);

                pack();

        }

        public static void main(String[] arguments) {

                // creating JFrame object and setting it visible
                JFrameTest frame = new JFrameTest();
                frame.setVisible(true);

        }

}

JPanelOne.java:

import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.SwingConstants;

public class JPanelOne extends JPanel
{

        public JPanelOne()
        {
                // setting up black JPanel
                JPanel panel = new JPanel();
                panel.setPreferredSize(new Dimension(220, 40));
                panel.setBackground(Color.BLACK);

                // creating button on external JPanel
                JButton button = new JButton("Button (+JPanel) from external class");

                // adding button to the black JPanel
                panel.add(button);

                // adding blackJPanel
                add(panel);
        }
}

Print screen of working example:

http://i.stack.imgur.com/qKeBp.jpg

Maybe someone will find it helpful in their problem.