下面是我的一个简单java程序代码，可以练习下。
有的功能没弄完，有兴趣的可以完成他，对学java 很有帮助。
package swing;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.swing.event.*;
public class Frame1 extends JFrame {
Container c = new Container();
Label la = new Label("请帮助边远山区的可怜儿童们!");
JMenuBar jmb = new JMenuBar();
JMenu file = new JMenu("File");
JMenu edit = new JMenu("Edit");
JMenu option = new JMenu("Option");
JMenu about = new JMenu("about");
JMenuItem open = new JMenuItem("Open");
JMenuItem save = new JMenuItem("Save as");
JMenuItem exit = new JMenuItem("Exit");
JMenuItem copy = new JMenuItem("Copy");
JMenuItem cut = new JMenuItem("Cut");
JMenuItem paste = new JMenuItem("Paste");
JMenuItem delete = new JMenuItem("DeleteAll");
JMenuItem italic = new JMenuItem("Italic");
JMenuItem bold = new JMenuItem("Bold");
JMenuItem version = new JMenuItem("about");
JMenuItem help = new JMenuItem("help");
JTextPane ta = new JTextPane();
JFileChooser chooser = new JFileChooser();
FileInputStream filestream = null;
myversion exitversion = new myversion();
String selected = new String();
int dot, mark;
public Frame1() {
chooser.setSize(400, 350);
chooser.setDialogTitle("请帮助边远山区的可怜儿童们！");
chooser.setVisible(true);
la.setSize(200, 20);
la.setBackground(Color.orange);
Font f = new Font("TimesRoman", Font.PLAIN, 16);
c = this.getContentPane();
c.setLayout(new BorderLayout());
c.add(ta, "Center");
this.setJMenuBar(jmb);
jmb.setLayout(new FlowLayout(FlowLayout.LEFT, 10, 0));
jmb.add(file);
jmb.add(edit);
jmb.add(option);
jmb.add(about);
jmb.add(la);
file.add(open);
file.add(save);
file.add(exit);
edit.add(copy);
edit.add(cut);
edit.add(paste);
edit.add(delete);
option.add(italic);
option.add(bold);
about.add(version);
about.add(help);
open.addActionListener(new ListenActionForJfilechooser());
save.addActionListener(new ListenActionForJfilechooser());
exit.addActionListener(new exitListener());
copy.addActionListener(new copyListener());
cut.addActionListener(new cutListener());
paste.addActionListener(new pasteListener());
delete.addActionListener(new deleteListener());
italic.addActionListener(new italicListener());
bold.addActionListener(new boldListener());
version.addActionListener(new showversion());
ta.addCaretListener(new taListener());
ta.setFont(f);
}
class boldListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
Font f = new Font("TimesRoman", Font.BOLD, 16);
ta.setFont(f);
}
}
class italicListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
Font f = new Font("TimesRoman", Font.ITALIC, 16);
ta.setFont(f);
}
}
class deleteListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
Font f = new Font("TimesRoman", Font.PLAIN, 16);
ta.setText(null);
ta.setFont(f);
}
}
class cutListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
String s1 = new String();
selected = selectedString();
s1 = ta.getText();
int length = s1.length();
if (dot < mark) {
ta.setText(s1.substring(0, dot) + s1.substring(mark, length));
} else {
ta.setText(s1.substring(0, mark) + s1.substring(dot, length));
}
}
}
class pasteListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
ta.paste();
}
}
class taListener implements CaretListener {
public void caretUpdate(CaretEvent e) {
dot = e.getDot(); // 取得光标开始位置
mark = e.getMark();// 取得光标结束位置
}
}
class copyListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
selected = selectedString();
}
}
class exitListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
class ListenActionForJfilechooser implements ActionListener {
int result;
File file;
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if (e.getSource() == open) {
int state = chooser.showOpenDialog(null);
file = chooser.getSelectedFile();
if (file != null && state == JFileChooser.APPROVE_OPTION) {
try {
filestream = new FileInputStream(file);
la.setText("打开的文件是：" + file.getName());
} catch (Exception e1) {
// TODO 自动生成 catch 块
e1.printStackTrace();
}
try {
ta.read(filestream, this);
} catch (Exception e1) {
e1.printStackTrace();
}
}
}
if (e.getSource() == save) {
result = chooser.showSaveDialog(ta);
file = null;
if (result == JFileChooser.APPROVE_OPTION) {
file = chooser.getSelectedFile();
la.setText("存储文件名为:" + file.getName());
} else if (result == JFileChooser.CANCEL_OPTION) {
la.setText("您没有选择任何文件");
}
FileOutputStream fileOutStream = null;
if (file != null) {
try {
fileOutStream = new FileOutputStream(file);
} catch (FileNotFoundException fe) {
la.setText("File Not Found");
return;
}
String content = ta.getText();
try {
fileOutStream.write(content.getBytes());
} catch (IOException ioe) {
la.setText("写入文件错误");
} finally {
try {
if (fileOutStream != null)
fileOutStream.close();
} catch (IOException ioe2) {
}
}
}
}
}
}
class showversion implements ActionListener {
public void actionPerformed(ActionEvent e) {
exitversion.setVisible(true);
}
}
class myversion extends Frame {
Label l1 = new Label("Author: ChangTiger ");
Label l2 = new Label("Version 0.1");
Label l3 = new Label("2007.11.6");
Label l4 = new Label("Tel:13576947833");
myversion() {
this.setLayout(new FlowLayout(FlowLayout.CENTER, 50, 20));
this.add(l1);
this.add(l2);
this.add(l3);
this.add(l4);
this.setBounds(200, 180, 300, 200);
this.addWindowListener(new myWindowListener());
}
}
class myWindowListener extends WindowAdapter {
public void windowClosing(WindowEvent e) {
exitversion.setVisible(false);
}
}
String selectedString() {
String s = new String();
s = ta.getText();
if (dot < mark) {
s = s.substring(dot, mark);
} else {
s = s.substring(mark, dot);
}
return s;
}
public static void main(String[] args) {
Frame1 frame1 = new Frame1();
frame1.setSize(500, 400);
frame1.setVisible(true);
}
}