java代码编写记事本,记事本写代码java怎么运行

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();}

相关问答

Q1: 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);

}

}

Q2: 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);

}

}

Q3: 怎么用记事本编写java程序？

1、先下载安装java sdk 1.6或1.6以上最新版本,并安装。 2、用记事本编辑java源码如:public class Test{public static void main(String argv []){System.out.println("Hello Java!");}}

保存为"所有文件"，Test.java，主文件名与public class Test保持一致。 3、运行javac Test.java，进行编译，得到Test.class 4、用java命令解析运行 java Test ，注意，此处不用加上扩展名.class 5、从方便和提高效率来说，即使是专业程序员，对于大一点的程序，用记事本来编辑都没有用eclipse或netbeans这样的IDE方便。 6、如要进行Java EE或Java ME，或android开发，则必须要用IDE，除非是只做少量修改。 即使是喜欢用Linux的用户，他们也会用功能强大得多的vi

Q4: 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

Q5: java编写简单记事本

方法/步骤

下载JDK，并安装成功，CMD测试Java环境安装成功。出现如下提示则Java环境安装成功

打开mycelipse进入主界面，点击左上角file--new---java project,新建一个Java项目，项目名字任意取，这里我取名为note--然后点击完成，创建Java项目

然后右键项目下的src--new---package,新建一个包，包名我定为notetest，然后点击完成

然后右键我们建立好的包notetest--new--class，包名为Note,点击完成

首先我们想导入工程所需要的包，以便编写程序时进行调用

package notepad;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.io.BufferedReader;

import java.io.BufferedWriter;

首先定义好编写程序时变量，我们设为成员变量方便以后调用

public class Notepad{

//屏幕分辨率

int width = Toolkit.getDefaultToolkit().getScreenSize().width;

int height = Toolkit.getDefaultToolkit().getScreenSize().height;

//窗体

private Frame frm ;

//显示内容多行文本

private TextArea notetext;

//记事本菜单

private MenuBar mb;

//菜单

private Menu m ;

//菜单项

private MenuItem open,save;

为程序创建组件--Frame--菜单栏目--文本框TextArea

public Notepad(){init();}

private void init(){

frm = new Frame("模拟记事本");

//设置菜单

mb = new MenuBar();

m = new Menu("文件");

//显示文件的地方

notetext = new TextArea();

notetext.setBounds(30, 50, 750, 500);

frm.add(notetext);

myEvent();

为控件和按钮添加监听事件

private void myEvent() {

//打开菜单的事件处理

open.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

//判断路径和文件名是否为空 如果为空结束程序

if(dir == null || name == null)

//如果不为空讲路径名和文件名封装到File对象里

file = new File(dir,name);

//使用字符缓冲读取文件

BufferedReader bfr = null;

try {

bfr = new BufferedReader(new FileReader(file));

});

save.addActionListener(new ActionListener(){

//获取路径和文件名

String dir =fd.getDirectory();

String name = fd.getFile();

//如果不为空讲路径名和文件名封装到File对象里

file = new File(dir,name);

}

BufferedWriter bfr= null;

}

});

}

}

然后创建主方法，开始测试程序，新建一个NoteDemo类

package notepad;

public class NoteDemo {

public static void main(String[] args) {

new Notepad();

}

}