import java.awt.event.ActionListener;
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import java.util.EventListener;
import java.awt.event.*;
import java.awt.*;
import java.io.*;
import java.lang.*;
import java.awt.datatransfer.*;
import javax.swing.*;
public class MiniEdit extends JFrame implements ActionListener {
/**
* Method main
*
*
* @param args
*
*/
MenuBar menuBar = new MenuBar();
Menu file = new Menu("File"),
edit = new Menu("Edit"),
help = new Menu("Help");
MenuItem[] menuItem ={
new MenuItem("New"),
new MenuItem("Open"),
new MenuItem("Save"),
new MenuItem("Exit"),
new MenuItem("Select All"),
new MenuItem("Copy"),
new MenuItem("Cut"),
new MenuItem("Paste"),
new MenuItem("Help")
};
TextArea textArea = new TextArea();
String fileName = "NoName";
Toolkit toolKit = Toolkit.getDefaultToolkit();
Clipboard clipboard = toolKit.getSystemClipboard();
//opne and close message dialogs
private FileDialog openFileDialog =
new FileDialog(this,"Open File",FileDialog.LOAD);
private FileDialog saveFileDialog =
new FileDialog(this,"Save File",FileDialog.SAVE);
public static void main(String[] args) {
// TODO: Add your code here
MiniEdit MyEdit = new MiniEdit();
MyEdit.show();
}
/**
* Method MiniEdit
*
*
*/
public MiniEdit() {
// TODO: Add your code here
setTitle("MiniEdit");
setFont(new Font("Times New Roman",Font.PLAIN,15));
setBackground(Color.white);
setSize(500,500);
setMenuBar(menuBar);
menuBar.add(file);
menuBar.add(edit);
menuBar.add(help);
for(int i=0;i4;i++)
{
file.add(menuItem[i]);
edit.add(menuItem[i+4]);
}
help.add(menuItem[8]);
add(textArea);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
e.getWindow().dispose();
System.exit(0);
}
});
//add actionListener
for(int i=0;imenuItem.length;i++)
{
menuItem[i].addActionListener(this);
}
}
/**
* Method actionPerformed
*
*
* @param e
*
*/
public void actionPerformed(ActionEvent e) {
// TODO: Add your code here
Object eventSource = e.getSource();
if(eventSource == menuItem[0])//newItem
{
textArea.setText("");
}
else if(eventSource == menuItem[1])//OpenItem
{
openFileDialog.show();
fileName = openFileDialog.getDirectory()+openFileDialog.getFile();
if(fileName != null)
{
openFile(fileName);
}
}
else if(eventSource ==menuItem[2])//SaveItem
{
saveFileDialog.show();
fileName = saveFileDialog.getDirectory()+saveFileDialog.getFile();
if(fileName !=null)
{
writeFile(fileName);
}
}
else if(eventSource==menuItem[3])//exitItem
{
System.exit(0);
}
else if(eventSource == menuItem[4])//Select All
{
textArea.selectAll();
}
else if(eventSource == menuItem[5])//copy
{
String text = textArea.getSelectedText();
StringSelection selection= new StringSelection(text);
clipboard.setContents(selection,null);
}
else if(eventSource == menuItem[6])//cut
{
String text = textArea.getSelectedText();
StringSelection selection = new StringSelection(text);
clipboard.setContents(selection,null);
textArea.replaceText("",textArea.getSelectionStart(),
textArea.getSelectionEnd());
}
else if(eventSource == menuItem[7])//Paste
{
Transferable contents = clipboard.getContents(this);
if(contents==null)
return;
String text;
text="";
try{
text = (String)contents.getTransferData(DataFlavor.stringFlavor);
}catch(Exception ex){}
textArea.replaceText(text,
textArea.getSelectionStart(),textArea.getSelectionEnd());
}
else if(eventSource == menuItem[8])
{
// JOptionPane.showMessageDialog(null,"This is a MiniEdit.");
}
}
//Read 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(Exception e)
{
System.out.println("Error opening file!");
}
}
//write file
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!");
就这样交，不会错的
你好，很高兴回答你的问题。
首先，你需要安装jdk并配置环境变量。
然后，在命令行中，用javac命令编译你用记事本编写的代码。
下一步，在命令行中，用java命令执行编译后的结果。
//继承的类换一下，应该用swing包里面
class Jsben extends Frame { -- class Jsben extends JFrame {
frame的方法setMenuBar(bar);和setJMenuBar(bar);这个不太一样，功能类似
1、首先在电脑中新建一个记事本，将记事本的后缀改为“.java”，如下图所示。
2、然后使用记事本的方式打开，输入java程序代码，如下图所示。
3、接着在键盘上按“win+R”快捷键键打开运行，输入“cmd”，如下图所示。
4、在命令行输入“D:”，按“Enter”键进去D盘，再输入“cd Desktop”进去Desktop文件夹，如下图所示。
5、最后再输入“javac Test.java”，按“Enter”键编译java程序，如下图所示就完成了。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.filechooser.FileFilter;
public class Demo extends JFrame {
private static final long serialVersionUID = 1L; //Eclipse自动生成序列号
String name = "无标题";
JPanel menuPanel = new JPanel();
JTextArea text = new TextAreaMenu(); //文本编辑区
JScrollPane jsp = new JScrollPane(text); //可滚动编辑区
JMenuBar mnbMain = new JMenuBar();
JMenu mnServer = new JMenu("文件(F)");
JMenu mnEdit = new JMenu("编辑(E)");
JMenuItem[] mniServers = new JMenuItem[]{
new JMenuItem("新建(N)"),
new JMenuItem("保存(S)"),
new JMenuItem("打开(O)"),
new JMenuItem("退出(X)"),
};
{
menuPanel.setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0));
mnbMain.add(mnServer);
menuPanel.add(mnbMain);
mnbMain.setBounds(5, 0, 50, 30);
for (int i = 0; i mniServers.length; i++) {
mnServer.add(mniServers[i]);
}
mniServers[0].addActionListener(new ActionListener() { //定义"新建"组件操作
@Override
public void actionPerformed(ActionEvent arg0) {
new Demo(getLocation().x+15,getLocation().y+5);
}
});
mniServers[1].addActionListener(new ActionListener() { //定义"保存"组件操作
@Override
public void actionPerformed(ActionEvent arg0) {
chooseToSave();
}
});
mniServers[2].addActionListener(new ActionListener() { //定义"打开"组件操作
@Override
public void actionPerformed(ActionEvent arg0) {
chooseToOpen();
}
});
mniServers[3].addActionListener(new ActionListener() { //定义"退出"组件操作
@Override
public void actionPerformed(ActionEvent arg0) {
System.exit(0);
}
});
text.addFocusListener(new FocusListener() {
@Override
public void focusLost(FocusEvent e) {
// TODO Auto-generated method stub
}
@Override
public void focusGained(FocusEvent e) {
}
});
}
public Demo(int x,int y) {
this.setTitle( name +" - 记事本");
this.setBounds(x, y, 600, 400);
this.setLayout(new BorderLayout());
this.add(menuPanel, BorderLayout.NORTH);
this.add(jsp);
jsp.setBounds(5, 30, getWidth()-10, getHeight()-50);
this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
this.setVisible(true);
}
public Demo() {
this(200,200);
}
protected void chooseToSave() {
File file = chooseFile();
if(null==file)return;
if(file.exists()){
int cho = JOptionPane.showConfirmDialog(this, "文件已存在，是否覆盖？");
System.out.println(cho);
if(cho==JOptionPane.OK_OPTION)save(file);
else return;
}
else save(file);
}
private void save(File file) {
name = file.getName();
write(text.getText(),file.getPath());
this.setTitle( name +" - 记事本");
}
protected void chooseToOpen() {
File file = chooseFile();
if(null==file||!file.exists())return;
name = file.getName();
Demo.this.setTitle( name +" - 记事本");
read(text,file);
}
/*********************************************MAIN**************************************************/
public static void main(String[] args) {
new Demo();
}
private File chooseFile(){
JFileChooser chooser = new JFileChooser(); //构建文件选择器
chooser.setFileFilter(new FileFilter() {
@Override
public String getDescription() {
return "文本文件";
}
@Override
public boolean accept(File f) {
String name = f.getName().toLowerCase();
return f.isDirectory() || name.endsWith(".txt")
||name.endsWith(".c") || name.endsWith(".java")
||name.endsWith(".cpp"); //可识别文件
}
});
int result = chooser.showDialog(null, "确定");
if (result==JFileChooser.APPROVE_OPTION) {
File file = chooser.getSelectedFile();
System.out.println(file.getAbsolutePath());
} else {
System.out.println("未选择文件");
}
return chooser.getSelectedFile();
}
public static void read(JTextArea text,File file){ //定义读取文件操作
FileReader fr;
try {
fr = new FileReader(file);
BufferedReader br = new BufferedReader(fr);
String string = null;
while((string = br.readLine()) != null){
text.append(string+"\n");
}
br.close();
fr.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void write(String txt,String fileName){
FileWriter fw;
try {
fw = new FileWriter(fileName);
BufferedWriter bw = new BufferedWriter(fw);
bw.write(txt);
bw.flush();
bw.close();
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
class TextAreaMenu extends JTextArea implements MouseListener {
private static final long serialVersionUID = -2308615404205560110L;
private JPopupMenu pop = null; // 弹出菜单
private JMenuItem selectAll = null,copy = null, paste = null, cut = null, cancel=null; // 功能菜单
public TextAreaMenu() {
super();
init();
}
private void init() {
this.addMouseListener(this);
this.setSelectedTextColor(Color.red);
pop = new JPopupMenu();
pop.add(selectAll = new JMenuItem("全选"));
pop.add(copy = new JMenuItem("复制"));
pop.add(paste = new JMenuItem("粘贴"));
pop.add(cut = new JMenuItem("剪切"));
pop.add(cancel = new JMenuItem("撤销"));
selectAll.setAccelerator(KeyStroke.getKeyStroke('A', InputEvent.CTRL_MASK));
copy.setAccelerator(KeyStroke.getKeyStroke('C', InputEvent.CTRL_MASK));
paste.setAccelerator(KeyStroke.getKeyStroke('V', InputEvent.CTRL_MASK));
cut.setAccelerator(KeyStroke.getKeyStroke('X', InputEvent.CTRL_MASK));
cancel.setAccelerator(KeyStroke.getKeyStroke('Z', InputEvent.CTRL_MASK));
copy.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
action(e);
}
});
paste.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
action(e);
}
});
cut.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
action(e);
}
});
this.add(pop);
}
/**
* 菜单动作
* @param e
*/
public void action(ActionEvent e) {
String str = e.getActionCommand();
if (str.equals(selectAll.getText())) { // 全选
this.selectAll();
}
else if (str.equals(copy.getText())) { // 复制
this.copy();
} else if (str.equals(paste.getText())) { // 粘贴
this.paste();
} else if (str.equals(cut.getText())) { // 剪切
this.cut();
}
else if (str.equals(cancel.getText())) { //撤销
this.cut();
}
}
public JPopupMenu getPop() {
return pop;
}
public void setPop(JPopupMenu pop) {
this.pop = pop;
}
/**
* 剪切板中是否有文本数据可供粘贴
*
* @return true为有文本数据
*/
public boolean isClipboardString() {
boolean b = false;
Clipboard clipboard = this.getToolkit().getSystemClipboard();
Transferable content = clipboard.getContents(this);
try {
if (content.getTransferData(DataFlavor.stringFlavor) instanceof String) {
b = true;
}
} catch (Exception e) {
}
return b;
}
/**
* 文本组件中是否具备复制的条件
*
* @return true为具备
*/
public boolean isCanCopy() {
boolean b = false;
int start = this.getSelectionStart();
int end = this.getSelectionEnd();
if (start != end)
b = true;
return b;
}
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) {
copy.setEnabled(isCanCopy());
paste.setEnabled(isClipboardString());
cut.setEnabled(isCanCopy());
pop.show(this, e.getX(), e.getY());
}
}
public void mouseReleased(MouseEvent e) {
}
}
