import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class Java_3 extends MouseAdapter implements ActionListener
{
private JPopupMenu pop;
private JMenu subPop;
private JMenuItem color;
private JMenuItem exit;
private JMenuItem red;
private JMenuItem blue;
private JTextArea textArea;
private JFrame frame;
...
...
public static void main(String args[])
{
Java_3 example=new Java_3();
example.initGUI();
}
}
以上这段代码为什么不用继承JFrame类?