Java語言可以實現很多程序，那麼用java怎麼編寫記事本呢?下面跟本站小編一起來看看吧!
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class Notepad extends JFrame {
// 系統組件聲明
private JMenuBar menuBar = new JMenuBar();
private JEditorPane content = new JEditorPane();
private JScrollPane scroll = new JScrollPane(content);
private JFileChooser filechooser = new JFileChooser() ;
private BorderLayout bord = new BorderLayout();
private JLabel statusBar = new JLabel();
private JPanel pane = new JPanel();
private File file = null;
// 定義檔案選單
private JMenu fileMenu = new JMenu();
private JMenUItem newMenuItem = new JMenuItem();
private JMenuItem openMenuItem = new JMenuItem();
private JMenuItem saveMenuItem = new JMenuItem();
private JMenuItem saveAsMenuItem = new JMenuItem();
private JMenuItem pageSetupMenuItem = new JMenuItem();
private JMenuItem printMenuItem = new JMenuItem();
private JMenuItem exitMenuItem = new JMenuItem();
// 定義風格選單
private JMenu styleMenu = new JMenu();
private ButtonGroup styleMenuGroup = new ButtonGroup();
private JRadioButtonMenuItem javaStyleMenuItem = new JRadioButtonMenuItem();
private JRadioButtonMenuItem metalStyleMenuItem = new JRadioButtonMenuItem();
private JRadioButtonMenuItem windowsStyleMenuItem = new JRadioButtonMenuItem();
// 定義幫助選單
private JMenuItem aboutMenuItem = new JMenuItem();
private JMenuItem helpTopicMenuItem = new JMenuItem();
private JMenu helpMenu = new JMenu();
// 構造函數
public Notepad(){
initComponents();
}
private void initComponents(){
// 添加子選單項到檔案選單
fileMenu.setText("/u6587/u4ef6 (F)");
newMenuItem.setText(" 新建(N) Ctrl+N");
openMenuItem.setText(" 開啟(O)... Ctrl+O");
saveMenuItem.setText(" 儲存(S) Ctrl+S");
saveAsMenuItem.setText(" 另存爲(A)...");
pageSetupMenuItem.setText(" 頁面設定(U)...");
printMenuItem.setText(" 打印(P)... Ctrl+P");
exitMenuItem.setText(" 退出");
fileMenu.add(newMenuItem);
fileMenu.add(openMenuItem);
fileMenu.add(saveMenuItem);
fileMenu.add(saveAsMenuItem);
fileMenu.addSeparator();
fileMenu.add(pageSetupMenuItem);
fileMenu.add(printMenuItem);
fileMenu.addSeparator();
fileMenu.add(exitMenuItem);
// 添加子選單項到風格選單
styleMenu.setText("風格(S)");
javaStyleMenuItem.setText("Java默認");
metalStyleMenuItem.setText("Metal風格");
windowsStyleMenuItem.setText("Windows風格");
styleMenuGroup.add(javaStyleMenuItem);
styleMenuGroup.add(metalStyleMenuItem);
styleMenuGroup.add(windowsStyleMenuItem);
styleMenu.add(javaStyleMenuItem);
styleMenu.add(metalStyleMenuItem);
styleMenu.add(windowsStyleMenuItem);
// 添加子選單項到幫助選單
helpMenu.setText("幫助(H)");
helpTopicMenuItem.setText(" 幫助主題(H)");
aboutMenuItem.setText(" 關於記事本(A)");
helpMenu.add(helpTopicMenuItem);
helpMenu.addSeparator();
helpMenu.add(aboutMenuItem);
// 定義檔案選單下的事件監聽
newMenuItem.addActionListener(new newMenuItem_actionAdapter(this));
openMenuItem.addActionListener(new openMenuItem_actionAdapter(this));
saveMenuItem.addActionListener(new saveMenuItem_actionAdapter(this));
saveAsMenuItem.addActionListener(new saveAsMenuItem_actionAdapter(this));
pageSetupMenuItem.addActionListener(new pageSetupMenuItem_actionAdapter(this));
printMenuItem.addActionListener(new printMenuItem_actionAdapter(this));
exitMenuItem.addActionListener(new exitMenuItem_actionAdapter(this));
// 定義風格選單下的事件監聽
javaStyleMenuItem.addActionListener(new javaStyleMenuItem_actionAdapter(this));
metalStyleMenuItem.addActionListener(new metalStyleMenuItem_actionAdapter(this));
windowsStyleMenuItem.addActionListener(new windowsStyleMenuItem_actionAdapter(this));
// 定義幫助選單下的事件監聽
helpTopicMenuItem.addActionListener(new helpTopicMenuItem_actionAdapter(this));
aboutMenuItem.addActionListener(new aboutMenuItem_actionAdapter(this));
// 填加選單到選單欄
menuBar.add(fileMenu);
menuBar.add(styleMenu);
menuBar.add(helpMenu);
// 對主視窗的.一些設定
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setTitle("無標題 - /u8bb0/u4e8b/u672c");
this.setSize(640,480);
setJMenuBar(menuBar);
pane.setLayout(bord);
pane.add("Center",scroll);
setContentPane(pane);
}
// 定義新建選單項方法
public void newMenuItemActionPerformed(ActionEvent evt){
file = null;
if(!("".equals(content.getText()))){
Object[] options = { " 是(Y) ", " 否(N) "," 取消 " };
int s = JOptionPane.showOptionDialog(null, "/u6587/u4ef6 "+getTitle()+" /u7684/u6587/u5b57/u5df2/u7ecf/u6539/u53d8/u3002/n/u60f3/u4fdd/u5b58/u6587/u4ef6/u5417/uff1f", "/u8bb0/u4e8b/u672c",
JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE,
null, options, options[0]);
switch(s){
case 0:
int returnVal=filechooser.showSaveDialog(this);
if(returnVal == JFileChooser.APPROVE_OPTION) {
file=filechooser.getSelectedFile();
try{
FileWriter fw=new FileWriter(file);
fw.write(content.getText());
setTitle(filechooser.getSelectedFile().getName()+" - /u8bb0/u4e8b/u672c");
fw.close();
}
catch(Exception e){
e.printStackTrace();
}
break;
}
case 1:
content.setText("");
setTitle("無標題 - /u8bb0/u4e8b/u672c");
}
}
}
// 定義開啟選單項方法
public void openMenuItemActionPerformed(ActionEvent evt){
try {
file = null;
int returnVal = filechooser.showOpenDialog(this);
if(returnVal == JFileChooser.APPROVE_OPTION){
file = filechooser.getSelectedFile();
FileReader fr = new FileReader(file);
int len = (int)file.length();
char[] buffer = new char[len];
fr.read(buffer,0,len);
fr.close();
content.setText(new String(buffer));
}
}
catch(Exception e){
e.printStackTrace();
}
}
// 定義退出選單項方法
public void exitMenuItem_actionPerformed(ActionEvent e){
if(!("".equals(content.getText()))){
Object[] options = { " 是(Y) ", " 否(N) "," 取消 " };
int s = JOptionPane.showOptionDialog(null, "檔案的文字已經改變。/n想儲存檔案嗎?", "/u8bb0/u4e8b/u672c",
JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE,
null, options, options[0]);
switch(s){
case 0:
int returnVal=filechooser.showSaveDialog(this);
if(returnVal == JFileChooser.APPROVE_OPTION) {
file=filechooser.getSelectedFile();
try{
FileWriter fw=new FileWriter(file);
fw.write(content.getText());
setTitle(filechooser.getSelectedFile().getName()+" - /u8bb0/u4e8b/u672c");
fw.close();
}
catch(Exception ex){
ex.printStackTrace();
}
break;
}
case 1:
System.exit(0);
}
}
else{
System.exit(0);
}
}
// 儲存事件
public void saveMenuItemActionPerformed(ActionEvent evt){
int returnVal=filechooser.showSaveDialog(this);
if(returnVal == JFileChooser.APPROVE_OPTION) {
file=filechooser.getSelectedFile();
try{
FileWriter fw=new FileWriter(file);
fw.write(content.getText());
setTitle(filechooser.getSelectedFile().getName()+" - /u8bb0/u4e8b/u672c");
fw.close();
}
catch(Exception e){
e.printStackTrace();
}
}
}
// 另存爲事件
public void saveAsMenuItemActionPerformed(ActionEvent evt){
filechooser.setDialogTitle("另存爲...");
int returnVal = filechooser.showSaveDialog(this);
if(returnVal == JFileChooser.APPROVE_OPTION) {
file=filechooser.getSelectedFile();
try{
FileWriter fw=new FileWriter(file);
fw.write(content.getText());
setTitle(filechooser.getSelectedFile().getName()+" - /u8bb0/u4e8b/u672c");
fw.close();
}
catch(Exception e){
e.printStackTrace();
}
}
}
// 頁面設定事件
public void pageSetupMenuItemActionPerformed(ActionEvent evt){
JOptionPane.showMessageDialog(null,"此功能正在開發中...");
}
// 打印事件
public void printMenuItemActionPerformed(ActionEvent evt){
JOptionPane.showMessageDialog(null,"打印中...");
}
// 更新風格外觀方法
void changeLookFeel(String className) {
try {
UIManager.setLookAndFeel(className);
}
catch (Exception e) {
System.out.println(e);
}
SwingUtilities.updateComponentTreeUI(this);
}
// Java風格事件
public void javaStyleMenuItemActionPerformed(ActionEvent evt){
changeLookFeel("javax.swing.plaf.metal.MetalLookAndFeel");
}
// Motif風格事件
public void metalStyleMenuItemActionPerformed(ActionEvent evt){
changeLookFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
}
// MAC風格事件
public void windowsStyleMenuItemActionPerformed(ActionEvent evt){
changeLookFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
}
// 幫助事件
public void helpTopicMenuItemActionPerformed(ActionEvent evt){
JOptionPane.showMessageDialog(null,"/u9700/u8981/u5e2e/u52a9/u5417/uff1f");
}
// 關於事件
public void aboutMenuItemActionPerformed(ActionEvent evt){
JOptionPane.showMessageDialog(null,"/n/u7a0b/u5e8f/u540d/u79f0/uff1aJava /u8bb0/u4e8b/u672c/n/u4ee3/u7801/u7f16/u5199/uff1aCavien/n/u4f5c/u8005/u7f51/u7ad9/uff1ahttp:/www.cavien.com/nE-mail/u3000/[email protected]");
}
// 主函數
public static void main(String args[]) {
Notepad notepad = new Notepad();
notepad.setVisible(true);
}
}
// 定義新建事件類
class newMenuItem_actionAdapter implements ActionListener{
Notepad adaptee;
newMenuItem_actionAdapter(Notepad adaptee){
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent evt){
adaptee.newMenuItemActionPerformed(evt);
}
}
// 定義開啟事件類
class openMenuItem_actionAdapter implements ActionListener{
Notepad adaptee;
openMenuItem_actionAdapter(Notepad adaptee){
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent evt){
adaptee.openMenuItemActionPerformed(evt);
}
}
// 定義儲存事件類
class saveMenuItem_actionAdapter implements ActionListener{
Notepad adaptee;
saveMenuItem_actionAdapter(Notepad adaptee){
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent evt){
adaptee.saveMenuItemActionPerformed(evt);
}
}
// 定義另存爲事件類
class saveAsMenuItem_actionAdapter implements ActionListener{
Notepad adaptee;
saveAsMenuItem_actionAdapter(Notepad adaptee){
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent evt){
adaptee.saveAsMenuItemActionPerformed(evt);
}
}
// 定義頁面設定事件類
class pageSetupMenuItem_actionAdapter implements ActionListener{
Notepad adaptee;
pageSetupMenuItem_actionAdapter(Notepad adaptee){
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent evt){
adaptee.pageSetupMenuItemActionPerformed(evt);
}
}
// 定義打印事件類
class printMenuItem_actionAdapter implements ActionListener{
Notepad adaptee;
printMenuItem_actionAdapter(Notepad adaptee){
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent evt){
adaptee.printMenuItemActionPerformed(evt);
}
}
// 定義Java風格事件類
class javaStyleMenuItem_actionAdapter implements ActionListener{
Notepad adaptee;
javaStyleMenuItem_actionAdapter(Notepad adaptee){
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent evt){
adaptee.javaStyleMenuItemActionPerformed(evt);
}
}
// 定義Java風格事件類
class metalStyleMenuItem_actionAdapter implements ActionListener{
Notepad adaptee;
metalStyleMenuItem_actionAdapter(Notepad adaptee){
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent evt){
adaptee.metalStyleMenuItemActionPerformed(evt);
}
}
// 定義Java風格事件類
class windowsStyleMenuItem_actionAdapter implements ActionListener{
Notepad adaptee;
windowsStyleMenuItem_actionAdapter(Notepad adaptee){
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent evt){
adaptee.windowsStyleMenuItemActionPerformed(evt);
}
}
// 定義幫助主題事件類
class helpTopicMenuItem_actionAdapter implements ActionListener{
Notepad adaptee;
helpTopicMenuItem_actionAdapter(Notepad adaptee){
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent evt){
adaptee.helpTopicMenuItemActionPerformed(evt);
}
}
// 定義關於軟件事件類
class aboutMenuItem_actionAdapter implements ActionListener{
Notepad adaptee;
aboutMenuItem_actionAdapter(Notepad adaptee){
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent evt){
adaptee.aboutMenuItemActionPerformed(evt);
}
}
// 定義退出事件類
class exitMenuItem_actionAdapter implements ActionListener {
Notepad adaptee;
exitMenuItem_actionAdapter(Notepad adaptee){
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent evt){
adaptee.exitMenuItem_actionPerformed(evt);
}