作业，用java编写一个记事本程序，谁会啊

考试作业，求助

答案：import java.awt.*; 
import java.awt.event.*; 
import java.io.*; 
import java.text.SimpleDateFormat; 
import java.util.Date; 
import javax.swing.*; 
import javax.swing.event.*; 
@SuppressWarnings("serial") 
public class Notepad extends JFrame { 
JTextArea text = new JTextArea();  //字段摘要 
JMenuBar menubar = new JMenuBar(); 
JMenu files = new JMenu("文件(F)"); 
JMenu edit = new JMenu("编辑(E)"); 
JMenu formats = new JMenu("格式(O)"); 
JMenu view = new JMenu("查看(V)"); 
JMenu helps = new JMenu("帮助(H)"); 
JMenuItem newFile = new JMenuItem("新建(N)"); 
JMenuItem open = new JMenuItem("打开(O)..."); 
JMenuItem save = new JMenuItem("保存(S)"); 
JMenuItem saveAs = new JMenuItem("另存为(A)..."); 
JMenuItem exit = new JMenuItem("退出(X)"); 
JMenuItem undo = new JMenuItem("撤销(U)"); 
JMenuItem cut = new JMenuItem("剪切(T)"); 
JMenuItem copy = new JMenuItem("复制(C)"); 
JMenuItem paste = new JMenuItem("粘贴(P)"); 
JMenuItem delete = new JMenuItem("删除(L)"); 
JMenuItem find = new JMenuItem("查找(F)..."); 
JMenuItem findNext = new JMenuItem("查找下一个(N)"); 
JMenuItem replace = new JMenuItem("替换(R)..."); 
JMenuItem selectAll = new JMenuItem("全选(A)"); 
JMenuItem timeDate = new JMenuItem("时间/日期(D)"); 
JCheckBoxMenuItem lineWrap = new JCheckBoxMenuItem("自动换行(M)"); 
JMenuItem fonts = new JMenuItem("字体(F)..."); 
JCheckBoxMenuItem state = new JCheckBoxMenuItem("状态栏(S)"); 
JMenuItem help = new JMenuItem("帮助主题(H)"); 
JMenuItem about = new JMenuItem("关于记事本(A)"); 
String name;   //param name 保存标题名 
String openedPath = null;  //param openedPath 系统保存的打开路径 
boolean isChangered = false;  //param isChangered text是否被改动过，true表示改过，false表示未改动过 
boolean isOpened = false;  //param isOpened true表示打开的text，false表示新建的text 
String findStr = null;  //param findStr 保存要查找的字符串 
public Notepad(String name) { //构造函数 
super(name); 
this.name = name; 
int x,y; 
Dimension size = Toolkit.getDefaultToolkit().getScreenSize(); 
x = size.width; 
y = size.height; 
this.setSize(600, 500); 
this.setLocation((x-600)/2, (y-500)/2); 
windowAdapter winAda = new windowAdapter(); 
this.addWindowListener(winAda); 
menubar.add(files);  //以下添加控键 
menubar.add(edit); 
menubar.add(formats); 
menubar.add(view); 
menubar.add(helps); 
files.add(newFile); 
files.add(open); 
files.add(save); 
files.add(saveAs); 
files.addSeparator(); 
files.add(exit); 
edit.add(undo); 
edit.addSeparator(); 
edit.add(cut); 
edit.add(copy); 
edit.add(paste); 
edit.add(delete); 
edit.addSeparator(); 
edit.add(find); 
edit.add(findNext); 
edit.add(replace); 
edit.addSeparator(); 
edit.add(selectAll); 
edit.add(timeDate); 
formats.add(lineWrap); 
formats.add(fonts); 
view.add(state); 
helps.add(help); 
helps.addSeparator(); 
helps.add(about); 
this.setJMenuBar(menubar); 
this.add(new JScrollPane(text)); 
DocumentListener docLis = new documentListener(); 
text.getDocument().addDocumentListener(docLis); 
files.setMnemonic('F');  //以下为添加助记符 
edit.setMnemonic('E'); 
formats.setMnemonic('O'); 
view.setMnemonic('V'); 
helps.setMnemonic('H'); 
newFile.setMnemonic('N'); 
open.setMnemonic('O'); 
save.setMnemonic('S'); 
saveAs.setMnemonic('A'); 
exit.setMnemonic('X'); 
undo.setMnemonic('U'); 
cut.setMnemonic('T'); 
copy.setMnemonic('C'); 
paste.setMnemonic('P'); 
delete.setMnemonic('L'); 
find.setMnemonic('F'); 
findNext.setMnemonic('N'); 
replace.setMnemonic('R'); 
selectAll.setMnemonic('A'); 
timeDate.setMnemonic('D'); 
lineWrap.setMnemonic('M'); 
fonts.setMnemonic('F'); 
state.setMnemonic('S'); 
help.setMnemonic('H'); 
about.setMnemonic('A'); 
//以下添加快捷键 
newFile.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,InputEvent.CTRL_MASK)); 
open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK)); 
save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK)); 
exit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q,InputEvent.CTRL_MASK)); 
undo.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Z,InputEvent.CTRL_MASK)); 
cut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK)); 
copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK)); 
paste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK)); 
find.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F,InputEvent.CTRL_MASK)); 
replace.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_H,InputEvent.CTRL_MASK)); 
selectAll.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,InputEvent.CTRL_MASK)); 
findNext.setAccelerator(KeyStroke.getKeyStroke("F3")); 
timeDate.setAccelerator(KeyStroke.getKeyStroke("F5")); 
actionListener listener = new actionListener();  //增加监听 
newFile.addActionListener(listener); 
open.addActionListener(listener); 
save.addActionListener(listener); 
saveAs.addActionListener(listener); 
exit.addActionListener(listener); 
undo.addActionListener(listener); 
cut.addActionListener(listener); 
copy.addActionListener(listener); 
paste.addActionListener(listener); 
delete.addActionListener(listener); 
find.addActionListener(listener); 
findNext.addActionListener(listener); 
replace.addActionListener(listener); 
selectAll.addActionListener(listener); 
timeDate.addActionListener(listener); 
lineWrap.addActionListener(listener); 
fonts.addActionListener(listener); 
state.addActionListener(listener); 
help.addActionListener(listener); 
about.addActionListener(listener); 
fonts.setEnabled(false); 
state.setEnabled(false); 
} 
void save(boolean isChangered, boolean isOpened) { 
String savePath = new String(); 
if (isChangered && isOpened) { // 文件保存 
if (JOptionPane.showConfirmDialog(Notepad.this, "需要保存文件吗？","保存提示", JOptionPane.YES_NO_OPTION) == 
JOptionPane.YES_OPTION) { 
try { 
savePath = openedPath; 
FileOutputStream fos = new FileOutputStream(savePath); 
BufferedOutputStream bufferedOutput = new BufferedOutputStream(fos); 
bufferedOutput.write(text.getText().getBytes()); 
bufferedOutput.close(); 
fos.close(); 
this.isChangered = false; 
this.isOpened = true; 
} catch (Exception ex) { 
ex.printStackTrace(); 
} 
} 
} else if (isChangered && !isOpened) { //文件另存为 
savePath = null; 
if (JOptionPane.showConfirmDialog(Notepad.this, "需要保存文件吗？","另存为提示", JOptionPane.YES_NO_OPTION) == 
JOptionPane.YES_OPTION) { 
FileDialog saveFile = new FileDialog(Notepad.this,"保存文件...", FileDialog.SAVE); 
saveFile.setVisible(true); 
if (saveFile.getDirectory() != null&& saveFile.getFile() != null) { 
savePath = saveFile.getDirectory() + saveFile.getFile(); 
} 
if (savePath != null) { 
try { 
FileOutputStream fos = new FileOutputStream(savePath); 
BufferedOutputStream bufferedOutput = new BufferedOutputStream(fos); 
bufferedOutput.write(text.getText().getBytes()); 
bufferedOutput.close(); 
fos.close(); 
openedPath = savePath; 
this.isChangered = false; 
this.isOpened = true; 
} catch (Exception ex) { 
ex.printStackTrace(); 
} 
} 
} 
} 
} 
class windowAdapter extends WindowAdapter { //windows监听类 
public void windowClosing(WindowEvent e) { 
save(isChangered,isOpened); 
System.exit(0); 
} 
} 
class documentListener implements DocumentListener { //文档监听接口，判断文档是否被改过 
public void changedUpdate(DocumentEvent e) { 
isChangered = true; 
} 
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