若干个经典的Java小程序源代码

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_CLOSE); 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 textPanel = new JPanel(); textPanel.setBackground(new Color(100,100,100); field1 = new JTextField(姓名：老孙；学号：, 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); 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);private class turnListener implements ActionListener public 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); 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);private class turnListener implements ActionListener public 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); private JButton Button1;private JTextField field1;private JTextField field2;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 variables 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.getParameter(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:sqlserver:/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(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 void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException doGet(request, response); /Clean up resources public void destroy() Java2-聊天程序/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 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 out=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) this.in=in; this.all=v; public void run() while(true) try String s1=in.readUTF(); for(int i=0;iall.size();i+) Object obj=all.get(i); Socket socket=(Socket)obj; DataOutputStream out=new DataOutputStream(socket.getOutputStream(); out.writeUTF(s1); System.out.print(i); out.flush(); System.out.print(Message send over!); catch(Exception e)e.printStackTrace(); /ClientFrame.java 代码 package message; import java.awt.*; import java.awt.event.*; import javax.swing.*; import .*; import java.io.*; public class ClientFrame extends JFrame implements ActionListener JButton b1=new JButton (SendMessage); JButton b2=new JButton(Link Server); JTextField t1=new JTextField(20); JTextField t2=new JTextField(20); JLabel l=new JLabel(输入服务器名字:); JTextArea area=new JTextArea(10,20); JPanel p1=new JPanel(); JPanel p2=new JPanel(); JPanel p3=new JPanel(); JPanel p4=new JPanel(); Socket socket; public ClientFrame() this.getContentPane().add(p1); p2.add(new JScrollPane(area); p3.add(t1); p3.add(b1); p4.add(l); p4.add(t2); p4.add(b2); p2.setLayout(new FlowLayout(); p3.setLayout(new FlowLayout(); p4.setLayout(new FlowLayout(); p1.setLayout(new BorderLayout(); p1.add(North,p2); p1.add(Center,p3); p1.add(South,p4); b1.addActionListener(this); b2.addActionListener(this); this.pack(); show(); Java3-猜数字游戏/*1、编写一个猜数字的游戏，由电脑随机产生一个100以内的整数，让用户去猜，如果用户猜的比电脑大，则输出“大了，再小点！”，反之则输出“小了，再大点！”，用户总共只能猜十次，并根据用户正确猜出答案所用的次数输出相应的信息，如：只用一次就猜对，输出“你是个天才！”，八次才猜对，输出“笨死了！”,如果十次还没有猜对，则游戏结束！*/ import java.util.*; import java.io.*; public class CaiShu public static void main(String args) throws IOException Random a=new Random(); int num=a.nextInt(100); System.out.println(请输入一个100以内的整数：); for (int i=0;inum) System.out.println(输入的数大了，输小点的！); else if (shunum) System.out.println(输入的数小了，输大点的！); else System.out.println(恭喜你，猜对了！); if (i=2) System.out.println(你真是个天才！); else if (i=6) System.out.println(还将就，你过关了！); else if (i=8) System.out.println(但是你还真笨！); else System.out.println(你和猪没有两样了！); break; package GuessNumber; import java.io.*; import java.io.BufferedWriter; public class GuessNumber public void show() DataInputStream stdin = new DataInputStream(System.in); BufferedInputStream buffin = new BufferedInputStream(stdin); number = (int) (Math.random() * 10000); try while (flag) System.out.println(产生的随机数是：+number); System.out.println(这是一个猜数字的小游戏，请您输入一个从0到10000的数字！); input = stdin.readLine(); / guessnumber=Integer.parseInt(input); /* * if(Character.isLetter(guessnumber) * System.out.println(你输入的不是数字，请输入一个数字！); flag=true; */ /* * if(!Character.isDigit(input) * System.out.println(你输入的不是数字，请输入一个数字！); flag=true; */ guessnumber = Integer.parseInt(input); / guessnumber=Integer.valueOf(stdin.readLine().intValue(); System.out.println(你输入的数是： + guessnumber); if (number 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(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(userName, 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.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 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.isPlayer1); 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.getDisplay(gobang).setCurrent(winAlert,this); init(); repaint(); this.isPlayer=!this.isPlayer1;/切换下棋方 repaint(); private boolean checkWin() int num=1; if(num5) num=1; for(int i=1;i4;i+) if(isPlayer1(selectedX-i,selectedY) num+; ease break; for(int i=1;i4;i+) if(isPlayer1(selectedX+1,selectedY) num+; else break; if(num5) num=1; for(int i=1;i4;i+) if(isPlayer1(selectedX-i,selectedY) num+; ease break; for(int i=1;i4;i+) if(isPlayer1(selectedX+1,selectedY) num+; else break; if(num5 num=1; for(int i=1;i=4;i+) if(isPlayer1(sesectedX,selectedY-i) num+; ease break; for(int i=1;i=4;i+) if(isPlayer1(selectedX.,selectedY+i) num+; else break; if(num5) num=1; for(int i=1;i=4;i+) if(isPlayer1(selectedX+i,selectedY-i) num+; else break; for(int i=1;i=5) return true; else return false; private boolean isPlayer1(int y,int x) if(x=0 & y=0 & chessesxy!=null) if(chessesxy.isPlayer1=this.isPlayer1) return true; else return false; else return fale; JAVA计算器源代码import java.awt.*; import 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; StringBuffer 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.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=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.addActionListener(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(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(); b13=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); 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(-); 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.addActionListener(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(); p1=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(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 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().trim(); 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; 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(+(