JAVA教学用代码

				package joptionpaneex;
				
				import java.awt.BorderLayout;
				
				import javax.swing.JFrame;
				import javax.swing.JMenuBar;
				import javax.swing.JMenu;
				import javax.swing.JMenuItem;
				import javax.swing.JScrollPane;
				import javax.swing.JTextArea;
				import java.awt.event.ActionEvent;
				import java.awt.event.ActionListener;
				import javax.swing.JFileChooser;
				import javax.swing.JOptionPane;
				import java.io.File;
				import java.io.FileInputStream;
				import java.io.*;
				import java.awt.event.InputMethodEvent;
				import java.awt.event.InputMethodListener;
				import javax.swing.JPopupMenu;
				import java.awt.event.MouseEvent;
				import java.awt.event.MouseAdapter;
				
				/**
				 * Title: 
				 *
				 * Description: 
				 *
				 * Copyright: Copyright (c) 2007
				 *
				 * Company: 
				 *
				 * @author not attributable
				 * @version 1.0
				 */
				public class Frame2 extends JFrame {
				    BorderLayout borderLayout1 = new BorderLayout();
				    JMenuBar jMenuBar1 = new JMenuBar();
				    JMenu jMenu1 = new JMenu();
				    JMenuItem jMenuItem1 = new JMenuItem();
				    JMenuItem jMenuItem2 = new JMenuItem();
				    JMenuItem jMenuItem3 = new JMenuItem();
				    JMenuItem jMenuItem4 = new JMenuItem();
				    JScrollPane jScrollPane1 = new JScrollPane();
				    JTextArea jTextArea1 = new JTextArea();
				    JFileChooser jFileChooser1 = new JFileChooser("e:\\wkx");
				    JMenu jMenu2 = new JMenu();
				    JMenuItem jMenuItem5 = new JMenuItem();
				    JMenuItem jMenuItem6 = new JMenuItem();
				    JMenuItem jMenuItem7 = new JMenuItem();
				    JPopupMenu jPopupMenu1 = new JPopupMenu();
				    JMenuItem jMenuItem8 = new JMenuItem();
				    JMenuItem jMenuItem9 = new JMenuItem();
				    JMenuItem jMenuItem10 = new JMenuItem();
				    public Frame2() {
				        try {
				            jbInit();
				        } catch (Exception exception) {
				            exception.printStackTrace();
				        }
				    }
				    public static void main(String args[])
				    {
				        Frame2 frm=new Frame2();
				        frm.setLocation(100,100);
				        frm.setSize(600,450);
				        frm.setVisible(true);
				
				    }
				    private void jbInit() throws Exception {
				        getContentPane().setLayout(borderLayout1);
				        jMenu1.setMnemonic('F');
				        jMenu1.setText("文件(F)");
				        jMenuItem1.setText("新建");
				        jMenuItem1.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.
				                event.KeyEvent.VK_N, java.awt.event.KeyEvent.CTRL_MASK, false));
				        jMenuItem1.addActionListener(new Frame2_jMenuItem1_actionAdapter(this));
				        jMenuItem2.setText("打开");
				        jMenuItem2.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.
				                event.KeyEvent.VK_O, java.awt.event.KeyEvent.CTRL_MASK, false));
				        jMenuItem2.addActionListener(new Frame2_jMenuItem2_actionAdapter(this));
				        jMenuItem3.setText("保存");
				        jMenuItem3.addInputMethodListener(new
				                                          Frame2_jMenuItem3_inputMethodAdapter(this));
				        jMenuItem4.setText("推出");
				        jScrollPane1.setVerticalScrollBarPolicy(JScrollPane.
				                                                VERTICAL_SCROLLBAR_ALWAYS);
				        this.setJMenuBar(jMenuBar1);
				        jMenu2.setMnemonic('E');
				        jMenu2.setText("编辑(E)");
				        jMenuItem5.setText("粘贴");
				        jMenuItem6.setText("复制");
				        jMenuItem7.setText("剪切");
				        jMenuItem8.setText("粘贴");
				        jMenuItem9.setText("复制");
				        jMenuItem10.setText("剪切");
				        jTextArea1.addMouseListener(new Frame2_jTextArea1_mouseAdapter(this));
				        jMenuBar1.add(jMenu1);
				        jMenuBar1.add(jMenu2);
				        jMenu1.add(jMenuItem1);
				        jMenu1.add(jMenuItem2);
				        jMenu1.add(jMenuItem3);
				        jMenu1.add(jMenuItem4);
				        this.getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);
				        jScrollPane1.getViewport().add(jTextArea1);
				        jMenu2.add(jMenuItem5);
				        jMenu2.add(jMenuItem6);
				        jMenu2.add(jMenuItem7);
				        jPopupMenu1.add(jMenuItem8);
				        jPopupMenu1.add(jMenuItem9);
				        jPopupMenu1.add(jMenuItem10);
				    }
				
				    public void jMenuItem1_actionPerformed(ActionEvent e) {
				        jTextArea1.setText("");
				    }
				
				    public void jMenuItem2_actionPerformed(ActionEvent e) {
				        int t=jFileChooser1.showOpenDialog(this);
				        //int t=jFileChooser1.showSaveDialog(this);
				
				        File file=null;
				        String strline=null;
				        StringBuffer strbuf=null;
				        String str=null;
				        if(t==JFileChooser.APPROVE_OPTION)
				        {
				            JOptionPane.showMessageDialog(this,"打开");
				            file=jFileChooser1.getSelectedFile();
				            try {
				//                FileInputStream fin = new FileInputStream(file);
				                FileReader fin=new FileReader(file);
				                BufferedReader bu=new BufferedReader(fin);
				                strline=bu.readLine();
				                while(strline!=null)
				                {
				                     str=str+strline+"\n";
				
				                    strline=bu.readLine();
				                }
				                bu.close();
				                fin.close();
				                jTextArea1.setText(str);
				            } catch (FileNotFoundException ex) {
				            }catch(IOException ie)
				            {
				
				            }
				
				
				        }
				        if(t==JFileChooser.CANCEL_OPTION)
				        {
				            JOptionPane.showMessageDialog(this,"取消");
				        }
				    }
				
				    public void jMenuItem3_caretPositionChanged(InputMethodEvent event) {
				
				    }
				
				    public void jTextArea1_mouseClicked(MouseEvent e) {
				     //   jPopupMenu1.setVisible(true);
				      jPopupMenu1.show(this,e.getX(),e.getY());
				
				    }
				}
				
				
				class Frame2_jTextArea1_mouseAdapter extends MouseAdapter {
				    private Frame2 adaptee;
				    Frame2_jTextArea1_mouseAdapter(Frame2 adaptee) {
				        this.adaptee = adaptee;
				    }
				
				    public void mouseClicked(MouseEvent e) {
				        adaptee.jTextArea1_mouseClicked(e);
				    }
				}
				
				
				class Frame2_jMenuItem3_inputMethodAdapter implements InputMethodListener {
				    private Frame2 adaptee;
				    Frame2_jMenuItem3_inputMethodAdapter(Frame2 adaptee) {
				        this.adaptee = adaptee;
				    }
				
				    public void inputMethodTextChanged(InputMethodEvent event) {
				    }
				
				    public void caretPositionChanged(InputMethodEvent event) {
				        adaptee.jMenuItem3_caretPositionChanged(event);
				    }
				}
				
				
				class Frame2_jMenuItem2_actionAdapter implements ActionListener {
				    private Frame2 adaptee;
				    Frame2_jMenuItem2_actionAdapter(Frame2 adaptee) {
				        this.adaptee = adaptee;
				    }
				
				    public void actionPerformed(ActionEvent e) {
				        adaptee.jMenuItem2_actionPerformed(e);
				    }
				}
				
				
				class Frame2_jMenuItem1_actionAdapter implements ActionListener {
				    private Frame2 adaptee;
				    Frame2_jMenuItem1_actionAdapter(Frame2 adaptee) {
				        this.adaptee = adaptee;
				    }
				
				    public void actionPerformed(ActionEvent e) {
				        adaptee.jMenuItem1_actionPerformed(e);
				    }
				}