import java.io.*;import java.awt.event.*;import javax.swing.*;public class MainClass extends JFrame implements ActionListener{
int width = 500,height = 400;
JPanel panel;
JMenuBar bar;
JMenu fileMenu,editMenu,helpMenu;
JMenuItem 打开O,新建N,保存S,另存A,剪切T,复制C,粘贴P,关于A;
JTextArea textArea = null;
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