本文目录一览：
- 1、用JAVA编写一个记事本？
- 2、如何用JAVA编写简单的记事本程序？
- 3、怎样用java编写一个记事本 ,具体步骤！
- 4、如何用JAVA程序编写一个记事本
- 5、用Java语言编写一个记事本程序
- 6、电脑怎么用记事本写Java程序并运行？
用JAVA编写一个记事本？
public class MyText2 extends JFrame {
private JMenuBar mb;
private JMenu 文件, 编辑, 格式, 查看, 帮助;
private JTextArea editorArea;
public MyText2() {
super();
mb = new JMenuBar();
文件 = new JMenu("文件");
编辑 = new JMenu("编辑");
格式 = new JMenu("格式");
帮助 = new JMenu("帮助");
查看 = new JMenu("查看");
mb.add(文件);
mb.add(编辑);
mb.add(格式);
mb.add(查看);
mb.add(帮助);
setJMenuBar(mb);
Container container = getContentPane();
editorArea = new JTextArea();
editorArea.setLineWrap(true);
JScrollPane scrollPane = new JScrollPane(editorArea);
container.add(scrollPane);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e){
dispose();
}
});
setTitle("MyText");
setSize(600, 400);
setVisible(true);
}
public static void main(String args[]) {
MyText2 app = new MyText2();
}
}
如何用JAVA编写简单的记事本程序？
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import java.awt.datatransfer.*;public class NewEdit
{
public static void main(String args[])
{
MyFrame EditFrame=new MyFrame();
EditFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
EditFrame.setVisible(true);
}
}class MyFrame extends JFrame
{
public MyFrame()
{ Dimension screenSize=toolKit.getScreenSize();
int screenHeight=screenSize.height;
int screenWidth=screenSize.width;
setSize(screenWidth/2,screenHeight/2);
setLocation(screenWidth/4,screenHeight/4);
Image img=toolKit.getImage("icon.gif");
setIconImage(img);
setTitle("MyEdit");
JMenuBar menuBar=new JMenuBar();
setJMenuBar(menuBar);
JMenu fileMenu=new JMenu("文件");
JMenu editMenu=new JMenu("编辑");
JMenu helpMenu=new JMenu("帮助");
menuBar.add(fileMenu);
menuBar.add(editMenu);
menuBar.add(helpMenu);
JMenuItem newItem=new JMenuItem("新建");
newItem.addActionListener(new NewListener());
JMenuItem openItem=new JMenuItem("打开");
openItem.addActionListener(new OpenListener());
JMenuItem saveItem=new JMenuItem("保存");
saveItem.addActionListener(new SaveListener());
JMenuItem escItem=new JMenuItem("退出");
escItem.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent myE)
{
System.exit(0);
}
});
fileMenu.add(newItem);
fileMenu.add(openItem);
fileMenu.add(saveItem);
fileMenu.add(escItem);
JMenuItem allItem=new JMenuItem("全选");
//JMenuItem copyItem=new JMenuItem("复制");
//CopyAction copyAction=new CopyAction();
//copyItem.addActionListener(copyAction);
JMenuItem cutItem=new JMenuItem("剪切");
//JMenuItem pasteItem=new JMenuItem("粘贴");
//Action pasteAction=new PasteAction();
//pasteItem.addActionListener(pasteAction);
editMenu.add(allItem);
allItem.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent myE)
{
textArea.selectAll();
}
});
CopyAction copyAction=new CopyAction("剪切");
editMenu.add(copyAction);
CutAction cutAction=new CutAction("复制");
editMenu.add(cutAction);
Action pasteAction=new PasteAction("粘贴");
editMenu.add(pasteAction);
popup=new JPopupMenu();
popup.add(copyAction);
popup.add(pasteAction);
popup.add(cutAction);
textArea = new JTextArea();
textArea.add(popup);
textArea.addMouseListener(new
MouseListener(){
public void mouseClicked(MouseEvent e) {} public void mouseEntered(MouseEvent e) {} public void mouseExited(MouseEvent e) {} public void mousePressed(MouseEvent e) {
if (e.getButton() == MouseEvent.BUTTON3)
{
popup.show(textArea, e.getX(), e.getY());
}
} public void mouseReleased(MouseEvent e) {} });//可尝试用MouseAdapter,代码可能更简单
JScrollPane scroller = new JScrollPane(textArea);
add(scroller);
//OR--this.getContentPane().add(scroller)
//scroller.setComponentPopupMenu(popup);
//textArea.setInheritsPopupMenu(true);
//scroller.addMouseListener(new MouseAdapter(){});
}
public void writeFile(String fileName)
{
try
{
File file = new File(fileName);
FileWriter write = new FileWriter(file);
write.write(textArea.getText());
write.close();
}
catch(Exception e){
System.out.println("Error closing file!");
}
}
public void openFile(String fileName)
{
try
{
File file = new File(fileName);
FileReader readIn = new FileReader(file);
int size = (int)file.length();
int charsRead = 0;
char[] content = new char[size];
while(readIn.ready())
charsRead += readIn.read(content,charsRead,size-charsRead);
readIn.close();
textArea.setText(new String(content,0,charsRead));
}
catch(IOException e)
{
System.out.println("Error opening file!");
}
}
private class NewListener implements ActionListener
{
public void actionPerformed(ActionEvent myE)
{
textArea.setText("");
}
}
private class OpenListener implements ActionListener
{
public void actionPerformed(ActionEvent myE)
{
openFileDialog.setVisible(true);
fileName = openFileDialog.getDirectory()+openFileDialog.getFile();
if(fileName != null)
{
openFile(fileName);
}
}
}
private class SaveListener implements ActionListener
{
public void actionPerformed(ActionEvent myE)
{
saveFileDialog.setVisible(true);
fileName = saveFileDialog.getDirectory()+saveFileDialog.getFile();
if(fileName !=null)
{
writeFile(fileName);
}
}
}
private class CutAction extends AbstractAction
{
public CutAction(String name)
{
super(name);
}
public void actionPerformed(ActionEvent event)
{
String text = textArea.getSelectedText();
StringSelection selection = new StringSelection(text);
clipboard.setContents(selection,null);
textArea.replaceRange("",textArea.getSelectionStart(),
textArea.getSelectionEnd());
}
}
private class CopyAction extends AbstractAction
{
public CopyAction(String name)
{
super(name);
}
public void actionPerformed(ActionEvent event)
{
String text = textArea.getSelectedText();
StringSelection selection= new StringSelection(text);
clipboard.setContents(selection,null);
}
}
private class PasteAction extends AbstractAction
{
public PasteAction(String name)
{
super(name);
}
public void actionPerformed(ActionEvent event)
{
Transferable contents = clipboard.getContents(this);
if(contents==null)
return;
String text;
text="";
try
{
text = (String)contents.getTransferData(DataFlavor.stringFlavor);
}
catch(Exception ex){}
textArea.replaceRange(text,
textArea.getSelectionStart(),textArea.getSelectionEnd());
}
}
private JTextArea textArea;
private JPopupMenu popup;
private String fileName="";
private FileDialog openFileDialog=new FileDialog(this,"OpenFile",FileDialog.LOAD); private FileDialog saveFileDialog=new FileDialog(this,"SaveFile",FileDialog.SAVE);
Toolkit toolKit = Toolkit.getDefaultToolkit();
private Clipboard clipboard = toolKit.getSystemClipboard();}
怎样用java编写一个记事本 ,具体步骤！
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JDialog;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.JToolBar;
public class TextEditorFrame extends JFrame {
File file = null;
Color color = Color.red;
TextEditorFrame() {
initTextPane();
initAboutDialog();
initToolBar();
initMenu();
}
void initTextPane() {
getContentPane().add(new JScrollPane(text));
}
JTextPane text = new JTextPane(); // 这是用来做文本框的
JFileChooser filechooser = new JFileChooser(); // 文件选择框
JColorChooser colorchooser = new JColorChooser();//
JDialog about = new JDialog(this); // 关于对话框
JMenuBar menubar = new JMenuBar();// 菜单
JMenu[] menus = new JMenu[] { new JMenu("文件"), new JMenu("编辑"),
new JMenu("帮助") };
JMenuItem menuitems[][] = new JMenuItem[][] {
{ new JMenuItem("新建"), new JMenuItem("打开"), new JMenuItem("保存"), new JMenuItem("退出") },
{new JMenuItem("复制"), new JMenuItem("剪切"), new JMenuItem("粘贴"), new JMenuItem("颜色") }, { new JMenuItem("关于") } };
void initMenu() {
for (int i = 0; i menus.length; i++) {
menubar.add(menus[i]);
for (int j = 0; j menuitems[i].length; j++) {
menus[i].add(menuitems[i][j]);
menuitems[i][j].addActionListener(action);
}
}
this.setJMenuBar(menubar);
}
ActionListener action = new ActionListener() { // when here have not wrong:
public void actionPerformed(ActionEvent e) {
JMenuItem mi = (JMenuItem) e.getSource();
String id = mi.getText();
if (id.equals("新建")) {
text.setText("");
file = null;
} else if (id.equals("打开")) {
if (file != null)
filechooser.setSelectedFile(file);
int returnVal = filechooser
.showOpenDialog(TextEditorFrame.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
file = filechooser.getSelectedFile();
openFile();
}
} else if (id.equals("保存")) {
if (file != null)
filechooser.setSelectedFile(file);
int returnVal = filechooser
.showSaveDialog(TextEditorFrame.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
file = filechooser.getSelectedFile();
saveFile();
}
} else if (id.equals("退出")) {
TextEditorFrame f = new TextEditorFrame();
int s = JOptionPane.showConfirmDialog(f, "你真的要结束吗", "结束程序",
JOptionPane.YES_NO_CANCEL_OPTION);
if (s == JOptionPane.YES_OPTION)
System.exit(0);
} else if (id.equals("剪切")) {
text.cut();
} else if (id.equals("复制")) {
text.copy();
} else if (id.equals("粘贴")) {
text.paste();
} else if (id.equals("color")) {
color = JColorChooser.showDialog(TextEditorFrame.this, "",
color);
text.setForeground(color);
} else if (id.equals("关于")) {
about.setSize(200, 150);
about.show();
}
}
};
void saveFile() {
try {
FileWriter fw = new FileWriter(file);
fw.write(text.getText());
fw.close();
} catch (Exception e) {
e.printStackTrace();
}
}
void openFile() {
try {
FileReader fr = new FileReader(file);
int len = (int) file.length();
char[] buffer = new char[len];
fr.read(buffer, 0, len);
fr.close();
text.setText(new String(buffer));
} catch (Exception e) {
e.printStackTrace();
}
}
void initAboutDialog() {
about.getContentPane().add(new JLabel("作者－覃树新:记事本Q1.0版本"));
about.setModal(true);
about.setSize(200, 100);
}
JToolBar toolbar = new JToolBar();// 我来加上工具条
JButton[] buttons = new JButton[] {
new JButton("", new ImageIcon("qin.jpg")),
new JButton("", new ImageIcon("shu.jpg")),
new JButton("", new ImageIcon("xin.jpg")) };
void initToolBar() {
for (int i = 0; i buttons.length; i++)
toolbar.add(buttons[i]);
buttons[0].setToolTipText("复制");
buttons[0].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
text.copy();
}
});
buttons[1].setToolTipText("剪切");
buttons[1].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
text.cut();
}
});
buttons[2].setToolTipText("粘贴");
buttons[2].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
text.paste();
}
});
this.getContentPane().add(toolbar, BorderLayout.NORTH);
}
public static void main(String args[]) {
TextEditorFrame f = new TextEditorFrame();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e)
{
TextEditorFrame f = new TextEditorFrame();
int s = JOptionPane.showConfirmDialog(f, "你真的要结束吗", "结束程序",
JOptionPane.YES_NO_OPTION);
if (s == JOptionPane.YES_OPTION)
System.exit(0);
}
});
f.setTitle("简单的记事本");
f.setSize(800, 600);
f.setVisible(true);
}
}
以前看到的一个程序
如何用JAVA程序编写一个记事本
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.undo.CannotRedoException;
import javax.swing.undo.UndoManager;
import java.util.Date;
import java.text.SimpleDateFormat;
public class Notepad extends JFrame {
// 菜单
JMenuBar menub = new JMenuBar();
// 显示纯文本的多行区域
JTextArea text = new JTextArea();
JMenu files = new JMenu("文件(F)");
JMenu edit = new JMenu("编辑(E)");
JMenu formats = new JMenu("格式(O)");
JMenu help = 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 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");
JMenuItem about = new JMenuItem("关于记事本(A)");
JFrame th = this;
String name;
String openedPath = null;
boolean opened = false;
boolean reworked = false;
UndoManager undoManager = new UndoManager();
// 初始化窗体
public Notepad(String name) {
super(name);
this.name = name;
int x, y;
// 得到用户屏幕大小
Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
x = (size.width - 600) / 2;
y = (size.height - 400) / 2;
setSize(600, 400);
// 让程序界面显示在屏幕中央
setLocation(x, y);
// 将此窗口的最小大小设置为一个常量值。
setMinimumSize(new Dimension(250, 150));
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
// 初始化布局
void init() {
files.setMnemonic('F');
edit.setMnemonic('E');
formats.setMnemonic('O');
help.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');
selectAll.setMnemonic('A');
timeDate.setMnemonic('D');
lineWrap.setMnemonic('M');
about.setMnemonic('A');
// 为控件添加助记符
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));
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));
selectAll.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,
InputEvent.CTRL_MASK));
// 为控件添加快捷键
timeDate.setAccelerator(KeyStroke.getKeyStroke("F5"));
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.addSeparator();
edit.add(selectAll);
edit.add(timeDate);
formats.add(lineWrap);
formats.add(fonts);
help.add(about);
menub.add(files);
menub.add(edit);
menub.add(formats);
menub.add(help);
setJMenuBar(menub);
getContentPane().add(new JScrollPane(text));
Listen listen = new Listen();
Listen1 listen1 = new Listen1();
// 为控件添加事件侦听器
newFile.addActionListener(listen);
undo.addActionListener(listen);
open.addActionListener(listen);
save.addActionListener(listen);
saveAs.addActionListener(listen);
exit.addActionListener(listen);
cut.addActionListener(listen);
copy.addActionListener(listen);
paste.addActionListener(listen);
selectAll.addActionListener(listen);
timeDate.addActionListener(listen);
lineWrap.addActionListener(listen);
about.addActionListener(listen);
open.addActionListener(listen1);
save.addActionListener(listen1);
saveAs.addActionListener(listen1);
// 暂时没有实现的功能 :设置字体
//undo功能没有实现
fonts.setEnabled(false);
}
class Listen implements ActionListener {
// 实现用于一般操作的事件侦听器
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source == newFile) {
text.setText("");
// 设置标题
th.setTitle(name);
openedPath = null;
opened = false;
} else if (source == exit)
setVisible(false);
else if (source == undo)
try {
//此功能没有实现 撤销要用栈？
// undo.setEnabled(undoManager.canUndo());
undoManager.undo();
} catch (CannotRedoException cre) {
cre.printStackTrace();
}
else if (source == selectAll)
text.selectAll();
else if (source == cut)
text.cut();
else if (source == copy)
text.copy();
else if (source == paste)
text.paste();
else if (source == lineWrap)
// 设置文本区的换行策略(获取文本区的换行策略)
text.setLineWrap(!text.getLineWrap());
else if (source == about) {
String message = "--------\n版本：1.0\n作者：时超" +
"\n撤销功能要用堆栈存贮操作" +
"\n还有字体格式"+
"\n暂时没有实现" +
"\n\n感谢您的使用";
JOptionPane.showMessageDialog(th, message, "关于",
JOptionPane.PLAIN_MESSAGE);
} else if (source == timeDate) {
Date nowTime = new Date();
SimpleDateFormat times = new SimpleDateFormat(
"HH:mm yyyy-MM-dd");
text.insert(times.format(nowTime), text.getCaretPosition());
}
}
}
class Listen1 implements ActionListener {
// 实现用于对文件进行操作的事件侦听器
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
// 打开文件事件
if (source == open) {
// 显示对话窗口 以便选择文件
FileDialog openFile = new FileDialog(th, "打开文件",
FileDialog.LOAD);
openFile.setVisible(true);
// 获取文件路径
String filePath = openFile.getDirectory() + openFile.getFile();
try {
FileInputStream fis = new FileInputStream(filePath);
byte[] content = new byte[fis.available()];
fis.read(content);
text.setText(new String(content));
// 设置 TextComponent 的文本插入符的位置
text.setCaretPosition(0);
if (openFile.getFile() != null) {
th.setTitle(openFile.getFile() + name);
openedPath = filePath;
opened = true;
}
fis.close();
} catch (Exception ex) {
ex.printStackTrace();
}
opened = true;
}
// 保存及另存为事件
else if (source == save || source == saveAs) {
String savePath = openedPath;
if (savePath == null || source == saveAs) {
// 如果 mode 的值为 LOAD，那么文件对话框将查找要读取的文件，所显示的文件是当前目录中的文件
// 如果 mode 的值为 SAVE，则文件对话框将查找要写入文件的位置。
FileDialog saveFile = new FileDialog(th, "保存文件",
FileDialog.SAVE);
saveFile.setVisible(true);
savePath = saveFile.getDirectory() + saveFile.getFile();
}
try {
FileOutputStream fos = new FileOutputStream(savePath);
fos.write(text.getText().getBytes());
fos.close();
} catch (Exception ex) {
ex.printStackTrace();
}
if (source == save)
openedPath = savePath;
}
}
}
public static void main(String[] args) {
try {
// 使用当前线程的上下文类加载器加载给定类名称所指定的 LookAndFeel
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
System.err.println("Couldn't use the system look and feel:" + e);
}
String name = ("--记事本 版本1.0--");
Notepad note = new Notepad(name);
note.init();
note.setVisible(true);
}
}
用Java语言编写一个记事本程序
import java.awt.*;
import java.awt.event.*;
import java.io.FileReader;
import java.io.FileWriter;
import javax.swing.JFileChooser; import java.awt.*;
import java.awt.event.*;
import java.io.FileReader;
import java.io.FileWriter;
import javax.swing.JFileChooser;
public class TextEditor extends Frame implements ActionListener{
MenuBar mainmenubar=new MenuBar();
Menu file;
MenuItem nw;
MenuItem op;
MenuItem cl;
MenuItem sf;
MenuItem ex;
TextArea tx;
public TextEditor(String title){
super(title);
CloseHandler handler= new CloseHandler();
this.addWindowListener(handler);
setSize(400,400);
setLocationRelativeTo(null);
menuinit();
tx=new TextArea();
this.add(tx);
setVisible(true);
}
void menuinit(){
mainmenubar =new MenuBar();
file=new Menu("File");
nw=new MenuItem("Great");
op=new MenuItem("Open");
cl=new MenuItem("Close");
sf=new MenuItem("save");
ex=new MenuItem("Exit");
file.add(nw);
file.add(op);
file.add(cl);
file.add(sf);
file.add(ex);
mainmenubar.add(file);
setMenuBar(mainmenubar);
nw.addActionListener(this);
op.addActionListener(this);
cl.addActionListener(this);
sf.addActionListener(this);
ex.addActionListener(this);
}
public void actionPerformed(ActionEvent e){
Object ob=e.getSource();
JFileChooser f =new JFileChooser();
if((ob==nw)||(ob==ex)){
tx.setText("write word in here");
}else if(ob==op){
f.showOpenDialog(this);
try{
StringBuffer s=new StringBuffer();
FileReader in=new FileReader(f.getSelectedFile());
while(true){
int b=in.read();
if(b==-1)
break;
s.append((char)b);
}
String myString=s.toString();
char[] mychar=myString.toCharArray();
String unkeyFile =FileEncry(mychar);
tx.setText(unkeyFile.toString());
in.close();
}catch(Exception ee){
}
}else if(ob==sf){
f.showSaveDialog(this);
try{
FileWriter out =new FileWriter(f.getSelectedFile());
String mystr=tx.getText();
char[] strchar=mystr.toCharArray();
String keyFile =FileEncry(strchar);
out.write(keyFile);
out.close();
}catch (Exception ee){
}
}else if(ob==ex)
System.exit(0);
}
public static void main(String[] args){
new TextEditor("Simple TextEdit");
}
public String FileEncry(char[] encry){
StringBuffer str=new StringBuffer();
char[] encry1 =new char[encry.length];
for(int i=0; iencry.length;i++){
encry1[i]=(char) (encry[i]^'F');
str.append(encry1[i]);
}
return str.toString();
}
}
class CloseHandler extends WindowAdapter{
public void windowClosing(WindowEvent e){
System.exit(0);
}
}
电脑怎么用记事本写Java程序并运行？
1. 新建一个记事本，后缀名是 .java ；然后在里面写一段java的代码，如图：
2.把写好的java文件丢进D盘，就是第一步给出的那个class文件；
3. 打开dos界面 开始-〉运行-〉cmd-〉 这个是命令行模式,选择D盘，如图：
4.选择D盘之后，在命令提示符中输入“javac 文件名.java”,我的文件名为java，所以输入javac java.java然后回车，等待编译。这时候你就会发现它提示说javac不是内部文件。接下来就是java环境变量设置的问题了；
5.下载一个jdk执行默认安装。例如我下的jdk版本是： jdk-6u10-rc2-bin-b32-windows-i586-p-12_sep_2008.exe；
6.配置环境：右击我的电脑点属性，进去点高级就能看到环境变量。点进去就能设置你的系统变量了，如图：
6-1。变量名：classpath 变量值：(.;C:\Program Files\Java\jdk1.6.0_10\lib;)括号里面都是 （主要我们在编译运行程序的时候通过classpath可以帮助我们找到一些需要的系统类，“.”号是表示当前路径；“;”号是用来隔开多个变量值，如果你的系统里面已经有classpath环 境变量，就不用新建了，直接加“;”号，在后面加新值）；如图所示
