Action Button Sample

  
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JRootPane;

public class ActionButtonSample {

  public static void main(String args[]) {
    JFrame frame = new JFrame("DefaultButton");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    ActionListener actionListener = new ActionListener() {
      public void actionPerformed(ActionEvent actionEvent) {
        String command = actionEvent.getActionCommand();
        System.out.println("Selected: " + command);
      }
    };

    Container content = frame.getContentPane();
    content.setLayout(new GridLayout(2, 2));

    JButton button1 = new JButton("Text Button");
    button1.setMnemonic(KeyEvent.VK_B);
    button1.setActionCommand("First");
    button1.addActionListener(actionListener);
    content.add(button1);

    Icon warnIcon = new ImageIcon("Warn.gif");
    JButton button2 = new JButton(warnIcon);
    button2.setActionCommand("Second");
    button2.addActionListener(actionListener);
    content.add(button2);

    JButton button3 = new JButton("Warning", warnIcon);
    button3.setActionCommand("Third");
    button3.addActionListener(actionListener);
    content.add(button3);

    String htmlButton = "<html><sup>HTML</sup> <sub><em>Button</em></sub><br>"
        + "<font color=\"#FF0080\"><u>Multi-line</u></font>";
    JButton button4 = new JButton(htmlButton);
    button4.setActionCommand("Fourth");
    button4.addActionListener(actionListener);
    content.add(button4);

    JRootPane rootPane = frame.getRootPane();
    rootPane.setDefaultButton(button2);

    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

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Action Button Sample : Button « Swing JFC « Java

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