转载：Java中ApplicationFrame类源代码介绍

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        import   org.jfree.ui.ApplicationFrame     是界面方面的类

       其实它就只是一个窗口类

      即public Frame(String title) throws HeadlessException

      下面贴出它的原代码

package org.jfree.ui;

import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

import javax.swing.JFrame;

/**
 * A base class for creating the main frame for simple applications.  The frame listens for
 * window closing events, and responds by shutting down the JVM.  This is OK for small demo
 * applications...for more serious applications, you'll want to use something more robust.
 *
 * @author David Gilbert
 */
public class ApplicationFrame extends JFrame implements WindowListener {

    /**
     * Constructs a new application frame.
     *
     * @param title  the frame title.
     */
    public ApplicationFrame(final String title) {
        super(title);
        addWindowListener(this);
    }

    /**
     * Listens for the main window closing, and shuts down the application.
     *
     * @param event  information about the window event.
     */
    public void windowClosing(final WindowEvent event) {
        if (event.getWindow() == this) {
            dispose();
            System.exit(0);
        }
    }

    /**
     * Required for WindowListener interface, but not used by this class.
     *
     * @param event  information about the window event.
     */
    public void windowClosed(final WindowEvent event) {
        // ignore
    }

    /**
     * Required for WindowListener interface, but not used by this class.
     *
     * @param event  information about the window event.
     */
    public void windowActivated(final WindowEvent event) {
        // ignore
    }

    /**
     * Required for WindowListener interface, but not used by this class.
     *
     * @param event  information about the window event.
     */
    public void windowDeactivated(final WindowEvent event) {
        // ignore
    }

    /**
     * Required for WindowListener interface, but not used by this class.
     *
     * @param event  information about the window event.
     */
    public void windowDeiconified(final WindowEvent event) {
        // ignore
    }

    /**
     * Required for WindowListener interface, but not used by this class.
     *
     * @param event  information about the window event.
     */
    public void windowIconified(final WindowEvent event) {
        // ignore
    }

    /**
     * Required for WindowListener interface, but not used by this class.
     *
     * @param event  information about the window event.
     */
    public void windowOpened(final WindowEvent event) {
        // ignore
    }

}