swingapplication.java

几个简单的java学习代码

package thinkinjava;
import javax.swing.*;

import java.awt.*;
import java.awt.event.*;

public class SwingApplication {
    private static String labelPrefix = "Number of button clicks: ";
    private int numClicks = 0;

    public Component createComponents() {
        final JLabel label = new JLabel(labelPrefix + "0    ");

        JButton button = new JButton("I'm a Swing button!");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                numClicks++;
                label.setText(labelPrefix + numClicks);
            }
        });

        JPanel pane = new JPanel();
       pane.setBorder(BorderFactory.createEmptyBorder(
                                        30, //top
                                        30, //left
                                        10, //bottom
                                        30) //right
                                        );
        pane.setLayout(new GridLayout(0, 1));
        pane.add(button);
        pane.add(label);

        return pane;
    }

    public static void main(String[] args) {


        //Create the top-level container and add contents to it.
        JFrame frame = new JFrame("SwingApplication");
        SwingApplication app = new SwingApplication();
        Component contents = app.createComponents();
        frame.getContentPane().add(contents, BorderLayout.CENTER);

        //Finish setting up the frame, and show it.
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        frame.pack();
        frame.setVisible(true);
    }
}