我刚开始用 Swing 编程，这并不容易……我从一个加密程序开始，我碰壁了。当我单击我的 JMenuItem 时，它不会打开指定的 JPanel。这是我的代码。Eclipse 没有发现任何错误。
/**
* Copyright 2013
*
* You may edit this code and redistribute it to friends,
* but you MAY NOT say that this is yours, or sell it for
* money.
*/
package lakecoding.RAMBIT7;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
public class RAMBIT7 implements ActionListener {
private JFrame frame;
private JFrame About;
private JFrame License;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
RAMBIT7 window = new RAMBIT7();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public RAMBIT7() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setSize(200, 300); //1024x768, 800x600
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("RAMBIT7 Encryption Software 1.0.0");
frame.setResizable(false);
frame.getContentPane().setLayout(new FlowLayout(0, 13, 0)); //GridLayout, FlowLayout, GridBagLayout, BorderLayout
/**
* 'Encrypt' and 'Decrypt' buttons
*/
JButton encrypt = new JButton("Encrypt");
JButton decrypt = new JButton("Decrypt");
encrypt.addActionListener(this);
decrypt.addActionListener(this);
frame.getContentPane().add(encrypt);
frame.getContentPane().add(decrypt);
/**
* JMenuBar
*/
JMenuBar bar = new JMenuBar();
JMenu file = new JMenu("File");
JMenu help = new JMenu("Help");
JMenuItem about = new JMenuItem("About");
JMenuItem license = new JMenuItem("License");
JMenuItem close = new JMenuItem("Exit");
file.add(close);
help.add(about);
help.add(license);
bar.add(file);
bar.add(help);
about.addActionListener(this);
license.addActionListener(this);
close.addActionListener(this);
frame.setJMenuBar(bar);
}
public void intializeAbout() {
About = new JFrame();
About.setSize(200, 200);
About.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
About.setTitle("About");
About.setResizable(false);
About.getContentPane().setLayout(new FlowLayout());
}
public void intializeLicense() {
License = new JFrame();
License.setSize(200, 200);
License.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
License.setTitle("License");
License.setResizable(false);
License.getContentPane().setLayout(new FlowLayout());
}
@Override
public void actionPerformed(ActionEvent e) {
String a = e.getActionCommand();
if(a.equalsIgnoreCase("encrypt")) {
System.out.println("Begin RAMBIT7 encryption.");
//encryptRAMBIT7(input);
} else if(a.equalsIgnoreCase("decrypt")) {
System.out.println("Begin RAMBIT7 decryption.");
//decryptRAMBIT7(input);
} else if(a.equalsIgnoreCase("about")) {
intializeAbout();
} else if(a.equalsIgnoreCase("license")) {
intializeLicense();
} else if(a.equalsIgnoreCase("exit")) {
System.out.println("Terminating...");
System.exit(0);
}
}
}