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Writing the Swing version

The code to generate an Swing-based application is actually little different from a purely AWT-based one. The changes between the SwingFrame example, and the AWTFrame example, are highlighted in bold. Figure 4 shows the application in action, with the default 'Metal' L&F.

SwingFrame.java

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

public class SwingFrame
{
  public static void main (String args[])
   throws Exception
  {
    JFrame  frame = new JFrame("Swing Demo");
    JLabel  label = new JLabel("Swing Version");
    JButton button = new JButton ("Click to close");
    button.addActionListener( new ActionListener() {
      public void actionPerformed(ActionEvent evt)
      {
        System.exit(0);
      }
    });

    // Get content pane
    Container pane = frame.getContentPane();

    // Set layout manager
    pane.setLayout( new FlowLayout() );

    // Add to pane
    pane.add( label  );
    pane.add( button );
    frame.pack();

    // Center the frame
    Toolkit toolkit = Toolkit.getDefaultToolkit();

    // Get the current screen size
    Dimension scrnsize = toolkit.getScreenSize();

    // Get the frame size
    Dimension framesize= frame.getSize();

    // Set X,Y location
    frame.setLocation ( (int) (scrnsize.getWidth()
                        - frame.getWidth() ) / 2 ,
                        (int) (scrnsize.getHeight()
                        - frame.getHeight()) / 2);

    frame.setVisible(true);
  }
}

Figure 4- Swing Version

Wrapping it all up - Swing vs. AWT

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