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1、经典Java程序源代码1.加法器（该java源文件的名称是Adder.java）import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Adder implements ActionListenerJFrame AdderFrame;JTextField TOprand1;JTextField TOprand2;JLabel LAdd,LSum;JButton BAdd,BClear;JPanel JP1,JP2;public Adder()AdderFrame=new JFrame(AdderFr

2、ame);TOprand1=new JTextField(0.0);TOprand2=new JTextField(0.0);LAdd=new JLabel(+);LSum=new JLabel(= );BAdd=new JButton(Add);BClear=new JButton(Clear);JP1=new JPanel();JP2=new JPanel();BAdd.addActionListener(this);BClear.addActionListener(new ActionListener()public void actionPerformed(ActionEvent ev

3、ent)TOprand1.setText(0.0);TOprand2.setText(0.0);LSum.setText(=););AdderFrame.add(JP1);JP1.add(TOprand1);JP1.add(LAdd);JP1.add(TOprand2);JP1.add(LSum);AdderFrame.add(JP2);JP2.add(BAdd);JP2.add(BClear);AdderFrame.getContentPane().setLayout(new BorderLayout();AdderFrame.getContentPane().add(JP1,BorderL

4、ayout.NORTH);AdderFrame.getContentPane().add(JP2,BorderLayout.SOUTH);AdderFrame.addWindowListener(new WindowAdapter()public void windowClosing(WindowEvent event)System.exit(0););AdderFrame.pack();AdderFrame.setVisible(true);AdderFrame.setResizable(false);AdderFrame.setSize(250,100);public void actio

5、nPerformed(ActionEvent event)double sum=(double)(Double.valueOf(TOprand1.getText().doubleValue()+Double.valueOf(TOprand2.getText().doubleValue();LSum.setText(=+sum);public static void main(String args)Adder adder=new Adder();2. 小型记事本（该java源文件由两个类构成，名称为Notepad.java）import java.awt.*;import java.awt.e

6、vent.*;import javax.swing.*;import java.io.*;class mynotepad extends JFrame File file=null; Color color=Color.red; mynotepad() initTextContent(); initMenu(); initAboutDialog(); void initTextContent() getContentPane().add(new JScrollPane(content); JTextPane content=new JTextPane(); JFileChooser openf

7、ile=new JFileChooser(); JColorChooser opencolor=new JColorChooser(); JDialog about=new JDialog(this); JMenuBar menu=new JMenuBar(); /菜单栏的各个菜单项JMenu menus=new JMenunew JMenu(文件),new JMenu(编辑),new JMenu(关于); /文件菜单项的四个下拉菜单 /编辑菜单的四个下拉菜单 JMenuItem optionofmenu=new JMenuItemnew JMenuItem(新建),new JMenuItem

8、(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;imenus.length;i+) menu.add(menusi); for(int j=0;joptionofmenui.length;j+) menusi.add(optionofmenuij); optionofmenuij.addActionListener( a

9、ction ); this.setJMenuBar(menu); ActionListener action=new ActionListener() /添加事件监听 public void actionPerformed(ActionEvent e) String name = e.getActionCommand();JMenuItem MI=(JMenuItem)e.getSource();if(新建.equals(name)content.setText();file=null;else if(打开.equals(name) if(file !=null) openfile.setSe

10、lectedFile(file); int returnVal=openfile.showOpenDialog(mynotepad.this); if(returnVal=JFileChooser.APPROVE_OPTION) file=openfile.getSelectedFile(); unfold(); else if(保存.equals(name) if(file!=null) openfile.setSelectedFile(file); int returnVal=openfile.showSaveDialog(mynotepad.this); if(returnVal=JFi

11、leChooser.APPROVE_OPTION) file=openfile.getSelectedFile(); saving(); else if(退出.equals(name) mynotepad f=new mynotepad(); int s=JOptionPane.showConfirmDialog(f,退出？,退出,JOptionPane.YES_NO_OPTION); if(s=JOptionPane.YES_OPTION) System.exit(0); else if(剪切.equals(name) content.cut(); else if(复制.equals(nam

12、e) content.copy(); else if(粘贴.equals(name) content.paste(); else if(颜色.equals(name) color=JColorChooser.showDialog(mynotepad.this,color); content.setForeground(color); else if(关于.equals(name) about.setSize(300,150); about.show(); ; void saving() try FileWriter Writef=new FileWriter(file); Writef.wri

13、te(content.getText(); Writef.close(); catch(Exception e) e.printStackTrace(); void unfold() try FileReader Readf=new FileReader(file); int len=(int)file.length(); char buffer=new charlen; Readf.read(buffer,0,len); Readf.close(); content.setText(new String(buffer); catch(Exception e) e.printStackTrac

14、e(); void initAboutDialog() about.setLayout(new GridLayout(3,1); about.getContentPane().setBackground(Color.white); about.getContentPane().add(new JLabel(我的记事本程序);/对话框内容 about.getContentPane().add(new JLabel(制作者：Fwx); about.getContentPane().add(new JLabel(2007年12月); about.setModal(true); /设置对话框前端显示

15、about.setSize(100,100); about.setLocation(250,170); /设置对话框显示位置 ; public class Notepadpublic static void main(String args) /入口main函数mynotepad noted=new mynotepad(); noted.addWindowListener(new WindowAdapter() ); noted.setTitle(我的记事本程序); /记事本标题noted.setSize(640,320); /设置记事本大小noted.show(); noted.setLoc

16、ation(150,100); /设置记事本显示位置3. 简单计算器（该java源文件的名称是simplecalculator.java）import java.awt.*;import java.awt.event.*;import javax.swing.*;class simplecalculator static String point=new String();static String Amal=new String();static String ONE=new String();static String TWO=new String();static String THRE

17、E=new String();static String FOUR=new String();static String FIVE=new String();static String SIX=new String();static String SEVEN=new String();static String EIGHT=new String();static String NINE=new String();static String ZERO=new String();static String ResultState=new String();static Double QF;stat

18、ic JButton zero=new JButton(0);static JButton one=new JButton(1);static JButton two=new JButton(2);static JButton three=new JButton(3);static JButton four=new JButton(4);static JButton five=new JButton(5);static JButton six=new JButton(6);static JButton seven=new JButton(7);static JButton eight=new

19、JButton(8);static JButton nine=new JButton(9);static JButton add=new JButton(+);static JButton sub=new JButton(-);static JButton mul=new JButton(*);static JButton div=new JButton(/);static JButton QuFan=new JButton(+/-);static JButton Dian=new JButton(.);static JButton equal=new JButton(=);static JB

20、utton clear=new JButton(C);static JButton BaiFen=new JButton(%);static JButton FenZhiYi=new JButton(1/x);static int i=0;static Double addNumber;static Double subNumber;static Double mulNumber;static Double divNumber;static Double equalNumber;static Double temp;static JTextArea result=new JTextArea(1

21、,20);public static void main(String args)JFrame frame=new JFrame(计算器);result.setEditable(false);result.setText();ResultState=窗口空;JPanel ForResult=new JPanel();JPanel ForButton7_clear=new JPanel();JPanel ForButton4_mul=new JPanel();JPanel ForButton1_sub=new JPanel();JPanel ForButton0_equal=new JPanel

22、();FlowLayout FLO=new FlowLayout();ForResult.add(result);ForButton7_clear.setLayout(FLO);ForButton7_clear.add(seven);ForButton7_clear.add(eight);ForButton7_clear.add(nine);ForButton7_clear.add(div);ForButton7_clear.add(clear);ForButton4_mul.setLayout(FLO);ForButton4_mul.add(four);ForButton4_mul.add(

23、five);ForButton4_mul.add(six);ForButton4_mul.add(mul);ForButton4_mul.add(BaiFen);ForButton1_sub.setLayout(FLO);ForButton1_sub.add(one);ForButton1_sub.add(two);ForButton1_sub.add(three);ForButton1_sub.add(sub);ForButton1_sub.add(FenZhiYi);ForButton0_equal.setLayout(FLO);ForButton0_equal.add(zero);For

24、Button0_equal.add(QuFan);ForButton0_equal.add(Dian);ForButton0_equal.add(add);ForButton0_equal.add(equal);frame.getContentPane().setLayout(FLO);frame.getContentPane().add(ForResult);frame.getContentPane().add(ForButton7_clear);frame.getContentPane().add(ForButton4_mul);frame.getContentPane().add(For

25、Button1_sub);frame.getContentPane().add(ForButton0_equal);frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);frame.setBounds(250,250,245,245);frame.setResizable(false);frame.setVisible(true);clear.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)result.setText();ZERO

35、ext(8););nine.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)NINE=已经点击;ResultState=窗口不为空;if(point=已经点击|ZERO!=已经点击|ONE=已经点击|TWO=已经点击|THREE=已经点击|FIVE=已经点击|SIX=已经点击|SEVEN=已经点击|EIGHT=已经点击|NINE=已经点击&result.getText()!=0)result.append(9);if(ResultState=窗口空)result.setText(9););Dian.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)point=已经点击;i=i+1;if(ResultState=窗口不为空&i=1)result.append(.););

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