刚才我这登的两号 回答问题出现了碰撞,上面那阿辉的代码接这里！！！import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;import javax.swing.BorderFactory;
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.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingConstants;public class JNotePadUI extends JFrame {
private JMenuItem menuOpen;
private JMenuItem menuSave;
private JMenuItem menuSaveAs;
private JMenuItem menuClose; private JMenu editMenu;
private JMenuItem menuCut;
private JMenuItem menuCopy;
private JMenuItem menuPaste; private JMenuItem menuAbout;
private JTextArea textArea;
private JLabel stateBar;
private JFileChooser fileChooser;
private JPopupMenu popUpMenu; public JNotePadUI() {
super("新建文本文件");
setUpUIComponent();
setUpEventListener();
setVisible(true);
}
private void setUpUIComponent() {
// 菜单栏
JMenuBar menuBar = new JMenuBar();
// 设置「文件」菜单
JMenu fileMenu = new JMenu("文件");
menuOpen = new JMenuItem("打开");
// 快捷键设置
menuOpen.setAccelerator(
KeyStroke.getKeyStroke(
KeyEvent.VK_O,
InputEvent.CTRL_MASK));
menuSave = new JMenuItem("保存");
menuSave.setAccelerator(
KeyEvent.VK_S,
menuSaveAs = new JMenuItem("另存为"); menuClose = new JMenuItem("关闭");
menuClose.setAccelerator(
KeyEvent.VK_Q,
fileMenu.add(menuOpen);
fileMenu.addSeparator(); // 分隔线
fileMenu.add(menuSave);
fileMenu.add(menuSaveAs);
fileMenu.add(menuClose);
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
class test implements ActionListener
{
JFrame frame;
JTextArea ta;
JMenuBar mb;
ButtonGroup bg;
int a=0;
char c1;
int i=0;
public static void main(String[] args)
test that=new test();
that.go();
public void go()
frame=new JFrame("计算器");
Container cp= frame.getContentPane();
cp.setLayout(new FlowLayout());
mb=new JMenuBar();
bg=new ButtonGroup();
p1.setBackground(Color.yellow);
cp.setBackground(Color.CYAN);
frame.setJMenuBar(mb);
ta.setEditable(false);
p1.add(ta);
Border etched=BorderFactory.createEtchedBorder();
Border border=BorderFactory.createTitledBorder(etched,"计算类型");
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
b1.addActionListener(this);
b10.addActionListener(this);
b11.setActionCommand("*");
b11.addActionListener(this);
rb1.setActionCommand("kxx");
rb1.addActionListener(this);
public void actionPerformed(ActionEvent e) //throws Exception
if (e.getActionCommand()=="bzx")
if (e.getActionCommand()=="kxx")
if (e.getActionCommand()=="1")
ta.append("1");
if (e.getActionCommand()=="0")
ta.append("0");
if (e.getActionCommand()=="+")
s1=ta.getText();
d1 = Double.parseDouble(s1);
ta.setText("");
i=1;
if (e.getActionCommand()=="-")
if (e.getActionCommand()=="*")
if (e.getActionCommand()=="/")
if (e.getActionCommand()=="=")
if(i==1)
ta.setText("ERROR");
else
if (e.getActionCommand()=="C")
/*if (e.getActionCommand()=="Backspace")
//ta.cut(ta.select(a-1,a));
*/
if (e.getActionCommand()=="1/x")
if (e.getActionCommand()==".")
ta.append(".");
if (e.getActionCommand()=="+/-")
if (e.getActionCommand()=="x^y")
if (e.getActionCommand()=="√x")
if (e.getActionCommand()=="x!")
if (d10)
ta.setText( "error");
else if (d1==0)
ta.setText( "0.0");
else {
for (int k=1;k=d1 ;k++ )
if (e.getActionCommand()=="sin")
给你个做好了的Java的源程序的记事本,自己看看就行了的,不怎么难的---
import java.io.*;
public class MyNotepad implements ActionListener{
private JFrame frame=new JFrame("新记事本");
private JTextArea jta=new JTextArea();
private String result="";
private boolean flag=true;
private File f;
private JButton jb=new JButton("开始");
private JButton jbt=new JButton("替换为");
private JButton jba=new JButton("全部替换");
private Icon ic=new ImageIcon("D:\\java课堂笔记\\GUI\\11.gif");
private String value;
private int start=0;
private JFrame jf=new JFrame("查找");
private JFrame jfc=new JFrame("替换");
@Override
public void actionPerformed(ActionEvent e) {
String comm=e.getActionCommand();
if("新建".equals(comm)){
if(!(frame.getTitle().equals("新记事本"))){
if(!flag){
write();
newNew();
}else{
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null,"保存为");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句,保证了程序的健壮性
f=jfc.getSelectedFile();
flag=false;
}else if(!(jta.getText().isEmpty())){
}else if("打开".equals(comm)){
jfc.setDialogType(JFileChooser.OPEN_DIALOG);
int returnVal = jfc.showOpenDialog(null);
frame.setTitle(f.getName());
result=read();
value=result;
jta.setText(result);
}else if("保存".equals(comm)){
if(flag){
}else if("另存".equals(comm)){
int returnVal = jfc.showDialog(null,"另存");
}else if("退出".equals(comm)){
System.exit(0);
}else if("撤销".equals(comm)){
jta.setText(value);
}else if("剪切".equals(comm)){
value=jta.getText();
jta.cut();
}else if("复制".equals(comm)){
jta.copy();
}else if("粘贴".equals(comm)){
jta.paste();
}else if("删除".equals(comm)){
jta.replaceSelection(null);
}else if("全选".equals(comm)){
jta.selectAll();
}else if("查找".equals(comm)){
jf.add(jtf,BorderLayout.CENTER);
jf.add(jb,BorderLayout.SOUTH);
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}else if("替换".equals(comm)){
JLabel jl1=new JLabel("查找内容:");
jfc.setLayout(gl);
jfc.add(jl1);
jfc.add(jtf);
jfc.add(jb);
jfc.add(jt);
jfc.add(jbt);
jfc.add(jba);
jfc.pack();
jfc.setVisible(true);
jfc.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}else if("版本".equals(comm)){
JDialog jd=new JDialog(frame,"关于对话框");
JLabel l=new JLabel("哈哈哈哈哈哈哈哈哈哈呵呵呵呵呵呵呵呵呵呵呵呵呵");
jd.add(l,BorderLayout.CENTER);
jd.setVisible(true);
//jd.pack();
jd.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
}else if("开始".equals(comm)||"下一个".equals(comm)){
String temp=jtf.getText();
int s=value.indexOf(temp,start);
if(value.indexOf(temp,start)!=-1){
jta.setSelectionStart(s);
jta.setSelectionEnd(s+temp.length());
jta.setSelectedTextColor(Color.GREEN);
start=s+1;
jb.setText("下一个");
//value=value.substring(s+temp.length());//不能截取字串
}else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}else if("替换为".equals(comm)){
jta.replaceSelection(jt.getText());
}else if("全部替换".equals(comm)){
String temp=jta.getText();
temp=temp.replaceAll(jtf.getText(), jt.getText());
jta.setText(temp);
public String read(){
String temp="";
try {
FileInputStream fis = new FileInputStream(f.getAbsolutePath());
while(true){
int num=fis.read(b);
if(num==-1)break;
temp=temp+new String(b,0,num);
fis.close();
} catch (Exception e1) {
e1.printStackTrace();
return temp;
public void write(){
FileOutputStream fos=new FileOutputStream(f);
fos.write(jta.getText().getBytes());
fos.close();
} catch (Exception e) {
e.printStackTrace();
public void newNew(){
frame.dispose();
new MyNotepad();
flag=true;
public MyNotepad(){
JMenuBar jmb=new JMenuBar();
String[][] menuItemLab={{"新建","打开","保存","另存","退出"},
{"撤销","剪切","复制","粘贴","删除","全选","查找","替换"},
{"版本"}};
for(int i=0;imenuLab.length;i++){
JMenu menu=new JMenu(menuLab[i]);
jmb.add(menu);
for(int j=0;jmenuItemLab[i].length;j++){
JMenuItem jmi=new JMenuItem(menuItemLab[i][j]);
menu.add(jmi);
jmi.addActionListener(this);
frame.setJMenuBar(jmb);
jta.setLineWrap(true);//自动换行
JScrollPane jsp=new JScrollPane(jta);//滚动窗口面板
frame.add(jsp);
jb.addActionListener(this);
jbt.addActionListener(this);
jba.addActionListener(this);
public static void main(String[] args) {
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.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.MouseListener;
import java.io.FileNotFoundException;
import java.io.IOException;
import javax.swing.JPanel;
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();
JMenuBar mnbMain = new JMenuBar();
JMenu mnServer = new JMenu("文件(F)");
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);
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
public void actionPerformed(ActionEvent arg0) {
});
mniServers[1].addActionListener(new ActionListener() { //定义"保存"组件操作
chooseToSave();
chooseToOpen();
text.addFocusListener(new FocusListener() {
public void focusLost(FocusEvent e) {
// TODO Auto-generated method stub
public void focusGained(FocusEvent e) {
public Demo(int x,int y) {
this.setTitle( name +" - 记事本");
this.setLayout(new BorderLayout());
this.add(menuPanel, BorderLayout.NORTH);
this.add(jsp);
this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
this.setVisible(true);
public Demo() {
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());
protected void chooseToOpen() {
if(null==file||!file.exists())return;
Demo.this.setTitle( name +" - 记事本");
read(text,file);
/*********************************************MAIN**************************************************/
new Demo();
private File chooseFile(){
JFileChooser chooser = new JFileChooser(); //构建文件选择器
chooser.setFileFilter(new FileFilter() {
public String getDescription() {
return "文本文件";
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;
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) {
} catch (IOException e) {
public static void write(String txt,String fileName){
FileWriter fw;
fw = new FileWriter(fileName);
BufferedWriter bw = new BufferedWriter(fw);
bw.write(txt);
bw.flush();
bw.close();
fw.close();
class TextAreaMenu extends JTextArea implements MouseListener {
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() {
action(e);
paste.addActionListener(new ActionListener() {
cut.addActionListener(new ActionListener() {
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
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);
if (content.getTransferData(DataFlavor.stringFlavor) instanceof String) {
b = true;
return b;
* 文本组件中是否具备复制的条件
* @return true为具备
public boolean isCanCopy() {
int start = this.getSelectionStart();
int end = this.getSelectionEnd();
if (start != end)
public void mouseClicked(MouseEvent e) {
public void mouseEntered(MouseEvent e) {
public void mouseExited(MouseEvent e) {
public void mousePressed(MouseEvent e) {
copy.setEnabled(isCanCopy());
paste.setEnabled(isClipboardString());
cut.setEnabled(isCanCopy());
pop.show(this, e.getX(), e.getY());
public void mouseReleased(MouseEvent e) {
//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
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