helloswing.java

来自「sample project for J2SE」· Java 代码 · 共 47 行

package soe;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class HelloSwing extends JFrame implements ActionListener
{
/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
/**
* Clickng the button, appears Hello with Swing
*/
JButton button;
JLabel label;
public HelloSwing() {
super("SwingEventTest");
setSize(300, 200);
getContentPane().setLayout(new GridLayout(2, 1));
// Create button
button = new JButton("Click here");
getContentPane().add(button);
// Create label
label = new JLabel("");
label.setHorizontalAlignment(JLabel.CENTER);
getContentPane().add(label);
// Register action listener
button.addActionListener(this);
// Window Close event
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
//show();
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
// Event
if (e.getSource().equals(button)) {
label.setText("Hello");
}
}
public static void main(String[] args) {
new HelloSwing();
}
}