Java - Graphics Create graphics classes based on the Java Swing Library Delivera

Question

Java - Graphics

Create graphics classes based on the Java Swing Library

Deliverables

myJPanel.java and other classes as requested below.

Contents

What we have till now is:

-           app. java (which uses our extended class myJFrame.java)

-           myJFrame.java creates a standard JPanel

But you cannot do much with a standard JPanel.

We need to create a smart version of JPanel.

Once we have our own JPanel we can

-           add JButtons to it.

-           set different colors to the background.

For this lab you need to

create your own version of a JPanel using inheritance

Change our myJFrame.java so that it now creates your version of a JPanel instead of the standard JPanel.

Suggestions

In order to add a JButton to a JPanel:

JButton j1 = new JButton (“hello”);

add(j1);

Code So Far:

Explanation / Answer

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class JButtonListenerExample
{
static JFrame frame;

public static void main(String[] args)
{
    // schedule this for the event dispatch thread (edt)
    SwingUtilities.invokeLater(new Runnable()
    {
      public void run()
      {
        displayJFrame();
      }
    });
}

static void displayJFrame()
{
    frame = new JFrame("Our JButton listener example");

    // create our jbutton
    JButton showDialogButton = new JButton("Click Me");
   
    // add the listener to the jbutton to handle the "pressed" event
    showDialogButton.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        // display/center the jdialog when the button is pressed
        JDialog d = new JDialog(frame, "Hello", true);
        d.setLocationRelativeTo(frame);
        d.setVisible(true);
      }
    });

    // put the button on the frame
    frame.getContentPane().setLayout(new FlowLayout());
    frame.add(showDialogButton);

    // set up the jframe, then display it
    frame.setDefaultCloseOperation

(WindowConstants.EXIT_ON_CLOSE);
    frame.setPreferredSize(new Dimension(640, 480));
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
}
}

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