若干个经典的Java小程序源代码.doc

1、一个 Java小程序源代码（反转字符串）/BorderLayoutTest.javaimport java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.*;import javax.swing.event.*;public class test1 public static void main(String args) cloneFrame frame = new cloneFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CL

2、OSE);frame.show();class cloneFrame extends JFramepublic cloneFrame()setTitle(“机试程序“);setSize(600, 400);JPanel buttonPanel = new JPanel();buttonPanel.setBackground(new Color(56,43,85);Button1 = new JButton(“点击复制反转字符串“);Button1.addActionListener(new turnListener();buttonPanel.add(Button1);JPanel textP

3、anel = new JPanel();textPanel.setBackground(new Color(100,100,100);field1 = new JTextField(“姓名：老孙；学号：2004132028“, 20);field2 = new JTextField(“反转“, 20);field2.setEditable(false);textPanel.add(field1);textPanel.add(field2);JPanel tuPanel = new JPanel();JLabel label = new JLabel(new ImageIcon(“006.gif

4、“);tuPanel.add(label);tuPanel.setBackground(new Color(100,100,100);Container contentPane = getContentPane();contentPane.add(buttonPanel, BorderLayout.SOUTH);contentPane.add(textPanel, BorderLayout.NORTH);contentPane.add(tuPanel, BorderLayout.CENTER);contentPane.setBackground(new Color(100,100,100);p

5、rivate class turnListenerimplements ActionListenerpublic void actionPerformed(ActionEvent event)String gets = field1.getText();int i = gets.length();StringBuffer buffer = new StringBuffer(i);for(int j=i-1;j=0;j-)buffer.append(gets.charAt(j);String gets2 = buffer.toString();field2.setText(gets2);Cont

6、ainer contentPane = getContentPane();contentPane.add(buttonPanel, BorderLayout.SOUTH);contentPane.add(textPanel, BorderLayout.NORTH);contentPane.add(tuPanel, BorderLayout.CENTER);contentPane.setBackground(new Color(100,100,100);private class turnListenerimplements ActionListenerpublic void actionPer

7、formed(ActionEvent event)String gets = field1.getText();int i = gets.length();StringBuffer buffer = new StringBuffer(i);for(int j=i-1;j=0;j-)buffer.append(gets.charAt(j);String gets2 = buffer.toString();field2.setText(gets2);private JButton Button1;private JTextField field1;private JTextField field2

8、;Java1package com.kenki.emp; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import java.util.*; import java.sql.SQLException; import java.sql.*; public class emp extends HttpServlet private static final String CONTENT_TYPE = “text/html; charset=GBK“; /Initialize global variab

9、les public void init() throws ServletException /Process the HTTP Get request public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException response.setContentType(CONTENT_TYPE); PrintWriter out = response.getWriter(); String code = request.getParame

10、ter(“code“); String name = request.getParameter(“name“); String pay = request.getParameter(“pay“); System.out.println(“empcode:“ + code); System.out.println(“name:“ + name); System.out.println(“pay:“ + pay); /创建驱动 new com.microsoft.jdbc.sqlserver.SQLServerDriver(); String strd = “jdbc:microsoft:sqls

11、erver:/localhost:1433;databasename=emp_dates“; String username = “sa“; String pws = “; try java.sql.Connection conn = java.sql.DriverManager.getConnection( strd, username, pws); String strs = “insert into emp values(?,?,?)“; java.sql.PreparedStatement pre = conn.prepareStatement(strs); pre.setString

12、(1, code); pre.setString(2, name); pre.setString(3, pay); pre.execute(); pre.close(); conn.close(); /重定向至查询页面 out.println(“成功保存！“); response.sendRedirect(“emp.html“); catch (SQLException ss) ss.printStackTrace(); response.sendRedirect(“/WebModule1/error.html“); /Process the HTTP Post request public

13、void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException doGet(request, response); /Clean up resources public void destroy() Java2/这是个聊天程序， 在 ECLIPSE 运行 Client.java 就可以了。 连接是：localhost /Server 代码， package message; import java.io.*; import .*; import

14、java.util.*; public class Server public static void main(String args) throws Exception System.out.print(“Server“); ServerSocket socket=new ServerSocket(8888); Vector v=new Vector(); while(true) Socket sk=socket.accept(); DataInputStream in=new DataInputStream(sk.getInputStream(); DataOutputStream ou

15、t=new DataOutputStream(sk.getOutputStream(); v.add(sk); new ServerThread(in,v).start(); /ServerThread.java 代码 package message; import .*; import java.io.*; import java.util.*; public class ServerThread extends Thread DataInputStream in; Vector all; public ServerThread(DataInputStream in,Vector v) th

16、is.in=in; this.all=v; public void run() while(true) try String s1=in.readUTF(); for(int i=0;inum) System.out.println(“输入的数大了，输小点的！“); else if (shu guessnumber) System.out.println(“你输入的数小了请重新输入！“); count+; flag = true; if (number = guessnumber) System.out.println(“你真历害这么快你就猜对了!“); System.out.println(

17、“你一共猜了“ + count + “次“); flag = false; System.out.println(“请输入你的名字：“); String name = stdin.readLine(); byte names = name.getBytes(“ISO-8859-1“); userName = new String(names); System.out.println(“姓名：“ + userName); System.out.println(“记录是：“ + count + “次“); SaveFile save = new SaveFile(); save.output(us

18、erName, 0, userName.length(); / guessnumber=Integer.parseInt(stdin.readLine(); stdin.close(); buffin.close(); catch (IOException e) e.getMessage(); / e.toString(); System.out.println(“产生了异常！“); public static void main(String args) GuessNumber gus = new GuessNumber(); gus.show(); /* * try System.out.

19、println(“按回车结束.“); System.in.read(); * catch(IOException e) */ private static String input; / 用户开始输入数字或字母 private static int number; / 产生的随机数 private static int guessnumber;/ 用户输入的的数字 private static int count = 0; / 用统计用户猜的次数 private boolean flag = true; / 标记继续输入数字进行猜 private String userName; / 用来记录

20、猜对的用户名字 class SaveFile / 这个方法是将传过来的名字写入文件里 public void output(String name, int a, int length) try FileWriter sout = new FileWriter(“Gamererecord.txt“); BufferedWriter out = new BufferedWriter(sout); sout.write(name, 0, length); sout.close(); out.close(); catch (IOException e) System.out.println(“IO

21、Error“ + e); 可以直接出结果的，不过你得先建立一个名为 GuessNumber的包，在此包下建立一个名为 GuessNumber的类，然后将些段代码粘贴进来根据提示就可以出结果的JAVA小游戏代码int player1win,player2win; protected synchronized void keyPressed(int keyCode) . else if(action = Canvas.FIRE) if(chessesselectedYselectedX=null) chessesselectedYselectedX=new Chesses(this.isPlaye

22、r1); if(checkWin() String winner; if(isPlayer1) winner=“白方胜利“; player1win+; else winner=“红方胜利“; player2win+; try Thread.sleep(3000); catch(Exception e) Alert winAlert=new Alert(“, winner+“n白方 “+player1win+“:“+player2win+“红方“, null,AlertType.INFO); winAlert.setTimeout(Alert.FOREVER); Display.getDispl

23、ay(gobang).setCurrent(winAlert,this); init(); repaint(); this.isPlayer=!this.isPlayer1;/切换下棋方 repaint(); private boolean checkWin() int num=1; if(num=5) return true; else return false; private boolean isPlayer1(int y,int x) if(x=0 else return false; else return fale; JAVA计算器源代码import java.awt.*; imp

24、ort java.awt.event.*; import java.lang.*; import javax.swing.*; public class Counter extends Frame /声明三个面板的布局 GridLayout gl1,gl2,gl3; Panel p0,p1,p2,p3; JTextField tf1; TextField tf2; Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26; StringBuff

25、er str;/显示屏所显示的字符串 double x,y;/x和 y都是运算数 int z;/Z表示单击了那一个运算符.0 表示“+“,1 表示“-“,2 表示“*“,3 表示“/“ static double m;/记忆的数字 public Counter() gl1=new GridLayout(1,4,10,0);/实例化三个面板的布局 gl2=new GridLayout(4,1,0,15); gl3=new GridLayout(4,5,10,15); tf1=new JTextField(27);/显示屏 tf1.setHorizontalAlignment(JTextField

26、.RIGHT); tf1.setEnabled(false); tf1.setText(“0“); tf2=new TextField(10);/显示记忆的索引值 tf2.setEditable(false); /实例化所有按钮、设置其前景色并注册监听器 b0=new Button(“Backspace“); b0.setForeground(Color.red); b0.addActionListener(new Bt(); b1=new Button(“CE“); b1.setForeground(Color.red); b1.addActionListener(new Bt(); b2=

27、new Button(“C“); b2.setForeground(Color.red); b2.addActionListener(new Bt(); b3=new Button(“MC“); b3.setForeground(Color.red); b3.addActionListener(new Bt(); b4=new Button(“MR“); b4.setForeground(Color.red); b4.addActionListener(new Bt(); b5=new Button(“MS“); b5.setForeground(Color.red); b5.addActio

28、nListener(new Bt(); b6=new Button(“M+“); b6.setForeground(Color.red); b6.addActionListener(new Bt(); b7=new Button(“7“); b7.setForeground(Color.blue); b7.addActionListener(new Bt(); b8=new Button(“8“); b8.setForeground(Color.blue); b8.addActionListener(new Bt(); b9=new Button(“9“); b9.setForeground(

29、Color.blue); b9.addActionListener(new Bt(); b10=new Button(“/“); b10.setForeground(Color.red); b10.addActionListener(new Bt(); b11=new Button(“sqrt“); b11.setForeground(Color.blue); b11.addActionListener(new Bt(); b12=new Button(“4“); b12.setForeground(Color.blue); b12.addActionListener(new Bt(); b1

30、3=new Button(“5“); b13.setForeground(Color.blue); b13.addActionListener(new Bt(); b14=new Button(“6“); b14.setForeground(Color.blue); b14.addActionListener(new Bt(); b15=new Button(“*“); b15.setForeground(Color.red); b15.addActionListener(new Bt(); b16=new Button(“%“); b16.setForeground(Color.blue);

31、 b16.addActionListener(new Bt(); b17=new Button(“1“); b17.setForeground(Color.blue); b17.addActionListener(new Bt(); b18=new Button(“2“); b18.setForeground(Color.blue); b18.addActionListener(new Bt(); b19=new Button(“3“); b19.setForeground(Color.blue); b19.addActionListener(new Bt(); b20=new Button(

32、“-“); b20.setForeground(Color.red); b20.addActionListener(new Bt(); b21=new Button(“1/X“); b21.setForeground(Color.blue); b21.addActionListener(new Bt(); b22=new Button(“0“); b22.setForeground(Color.blue); b22.addActionListener(new Bt(); b23=new Button(“+/-“); b23.setForeground(Color.blue); b23.addA

33、ctionListener(new Bt(); b24=new Button(“.“); b24.setForeground(Color.blue); b24.addActionListener(new Bt(); b25=new Button(“+“); b25.setForeground(Color.red); b25.addActionListener(new Bt(); b26=new Button(“=“); b26.setForeground(Color.red); b26.addActionListener(new Bt(); /实例化四个面板 p0=new Panel(); p

34、1=new Panel(); p2=new Panel(); p3=new Panel(); /创建一个空字符串缓冲区 str=new StringBuffer(); /添加面板 p0中的组件和设置其在框架中的位置和大小 p0.add(tf1); p0.setBounds(10,25,300,40); /添加面板 p1中的组件和设置其在框架中的位置和大小 p1.setLayout(gl1); p1.add(tf2); p1.add(b0); p1.add(b1); p1.add(b2); p1.setBounds(10,65,300,25); /添加面板 p2中的组件并设置其的框架中的位置和大

35、小 p2.setLayout(gl2); p2.add(b3); p2.add(b4); p2.add(b5); p2.add(b6); p2.setBounds(10,110,40,150); /添加面板 p3中的组件并设置其在框架中的位置和大小 p3.setLayout(gl3);/设置 p3的布局 p3.add(b7); p3.add(b8); p3.add(b9); p3.add(b10); p3.add(b11); p3.add(b12); p3.add(b13); p3.add(b14); p3.add(b15); p3.add(b16); p3.add(b17); p3.add(

36、b18); p3.add(b19); p3.add(b20); p3.add(b21); p3.add(b22); p3.add(b23); p3.add(b24); p3.add(b25); p3.add(b26); p3.setBounds(60,110,250,150); /设置框架中的布局为空布局并添加 4个面板 setLayout(null); add(p0); add(p1); add(p2); add(p3); setResizable(false);/禁止调整框架的大小 /匿名类关闭窗口 addWindowListener(new WindowAdapter() public

37、void windowClosing(WindowEvent e1) System.exit(0); ); setBackground(Color.lightGray); setBounds(100,100,320,280); setVisible(true); /构造监听器 class Bt implements ActionListener public void actionPerformed(ActionEvent e2) try if(e2.getSource()=b1)/选择“CE“清零 tf1.setText(“0“);/把显示屏清零 str.setLength(0);/清空字符

38、串缓冲区以准备接收新的输入运算数 else if(e2.getSource()=b2)/选择“C“清零 tf1.setText(“0“);/把显示屏清零 str.setLength(0); else if(e2.getSource()=b23)/单击“+/-“选择输入的运算数是正数还是负数 x=Double.parseDouble(tf1.getText().trim(); tf1.setText(“+(-x); else if(e2.getSource()=b25)/单击加号按钮获得 x的值和 z的值并清空 y的值 x=Double.parseDouble(tf1.getText().tri

39、m(); str.setLength(0);/清空缓冲区以便接收新的另一个运算数 y=0d; z=0; else if(e2.getSource()=b20)/单击减号按钮获得 x的值和 z的值并清空 y的值 x=Double.parseDouble(tf1.getText().trim(); str.setLength(0); y=0d; z=1; else if(e2.getSource()=b15)/单击乘号按钮获得 x的值和 z的值并清空 y的值 x=Double.parseDouble(tf1.getText().trim(); str.setLength(0); y=0d; z=2

40、; else if(e2.getSource()=b10)/单击除号按钮获得 x的值和 z的值并空 y的值 x=Double.parseDouble(tf1.getText().trim(); str.setLength(0); y=0d; z=3; else if(e2.getSource()=b26)/单击等号按钮输出计算结果 str.setLength(0); switch(z) case 0 : tf1.setText(“+(x+y);break; case 1 : tf1.setText(“+(x-y);break; case 2 : tf1.setText(“+(x*y);brea

41、k; case 3 : tf1.setText(“+(x/y);break; else if(e2.getSource()=b24)/单击“.“按钮输入小数 if(tf1.getText().trim().indexOf(.)!=-1)/判断字符串中是否已经包含了小数点 else/如果没数点有小 if(tf1.getText().trim().equals(“0“)/如果初时显示为 0 str.setLength(0); tf1.setText(str.append(“0“+e2.getActionCommand().toString(); else if(tf1.getText().trim

42、().equals(“)/如果初时显示为空则不做任何操作 else tf1.setText(str.append(e2.getActionCommand().toString(); y=0d; else if(e2.getSource()=b11)/求平方根 x=Double.parseDouble(tf1.getText().trim(); tf1.setText(“数字格式异常“); if(x0) tf1.setText(“负数没有平方根“); else tf1.setText(“+Math.sqrt(x); str.setLength(0); y=0d; else if(e2.getSo

43、urce()=b16)/单击了“%“按钮 x=Double.parseDouble(tf1.getText().trim(); tf1.setText(“+(0.01*x); str.setLength(0); y=0d; else if(e2.getSource()=b21)/单击了“1/X“按钮 x=Double.parseDouble(tf1.getText().trim(); if(x=0) tf1.setText(“除数不能为零“); else tf1.setText(“+(1/x); str.setLength(0); y=0d; else if(e2.getSource()=b3)/MC为清除内存 m=0d; tf2.setText(“); str.setLength(0); else if(e2.getSource()=b4)/MR为重新调用存储的数据 if(tf2.getText().trim()!=“)/有记忆数字