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 JFrame{public 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：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"));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 turnListenerimplements 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 turnListenerimplements 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 variablespublic void init() throws ServletException {}//Process the HTTP Get requestpublic void doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, 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 requestpublic void doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {doGet(request, response);}//Clean up resourcespublic 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;i<all.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;i<=9;i++){BufferedReader bf=new BufferedReader(new InputStreamReader(System.in));String str=bf.readLine();int shu=Integer.parseInt(str);if (shu>num)System.out.println("输入的数大了，输小点的！"); else if (shu<num)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！");elseSystem.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("你输入的数大了请重新输入!");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) {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(chesses[selectedY][selectedX]==null){chesses[selectedY][selectedX]=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,);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(num<5){num=1;for(int i=1;i<4;i++){if(isPlayer1(selectedX-i,selectedY)){num++;}ease break;}for(int i=1;i<4;i++){if(isPlayer1(selectedX+1,selectedY)){num++;}else break;}}if(num<5){num=1;for(int i=1;i<4;i++){if(isPlayer1(selectedX-i,selectedY)){ num++;}ease break;}for(int i=1;i<4;i++){if(isPlayer1(selectedX+1,selectedY)){ num++;}else break;}}if(num<5{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(num<5){num=1;for(int i=1;i<=4;i++){if(isPlayer1(selectedX+i,selectedY-i)) num++;else break;}for(int i=1;i<=4;i++){if(isPlayer1(selectedX-i,selectedY+i)) num++;else break;}}if(num>=5)return true;elsereturn false;}private boolean isPlayer1(int y,int x){if(x<=15 && x>=0 && y<=15 && y>=0 && chesses[x][y]!=null){ if(chesses[x][y].isPlayer1==this.isPlayer1)return true;elsereturn false;}else return fale;}JAVA计算器源代码import java.awt.*;import java.awt.event.*;import ng.*;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;Buttonb0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b1 9,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(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(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(""+(x+y));break;case 1 : tf1.setText(""+(x-y));break;case 2 : tf1.setText(""+(x*y));break;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().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(x<0)tf1.setText("负数没有平方根");elsetf1.setText(""+Math.sqrt(x));str.setLength(0);y=0d;}else if(e2.getSource()==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{tf1.setText(""+m);}}else if(e2.getSource()==b5)//MS为存储显示的数据{m=Double.parseDouble(tf1.getText().trim());tf2.setText("M");tf1.setText("0");str.setLength(0);}else if(e2.getSource()==b6)//M+为将显示的数字与已经存储的数据相加要查看新的数字单击MR{m=m+Double.parseDouble(tf1.getText().trim());}else//选择的是其他的按钮{if(e2.getSource()==b22)//如果选择的是"0"这个数字键{if(tf1.getText().trim().equals("0"))//如果显示屏显示的为零不做操作{}else{tf1.setText(str.append(e2.getActionCommand()).toString());y=Double.parseDouble(tf1.getText().trim());}}else if(e2.getSource()==b0)//选择的是“BackSpace”按钮{if(!tf1.getText().trim().equals("0"))//如果显示屏显示的不是零{if(str.length()!=1){tf1.setText(str.delete(str.length()-1,str.length()).toString());//可能抛出字符串越界异常}else{tf1.setText("0");str.setLength(0);}}y=Double.parseDouble(tf1.getText().trim());}else//其他的数字键{tf1.setText(str.append(e2.getActionCommand()).toString()); y=Double.parseDouble(tf1.getText().trim());}}}catch(NumberFormatException e){tf1.setText("数字格式异常");}catch(StringIndexOutOfBoundsException e){tf1.setText("字符串索引越界");}}}public static void main(String args[]){new Counter();}}简洁java计算器代码import java.awt.*;import java.awt.event.*;import javax.swing.*; //引入所需要的包class MyFrame extends JFrame implements ActionListener{ private JButton b1,b2,b3,b4,b5,b6;private TextField t1,t2,t3; //定义六个按钮和三个文本域public MyFrame(String s){super(s);b1=new JButton("加");b2=new JButton("减");b3=new JButton("乘");b4=new JButton("除");//对按钮加文字标签Panel p=new Panel(); //生成一个面板p.setLayout(new FlowLayout()); //以FlowLayout来规划面板中的组件t1=new TextField ("",4);t2=new TextField("",4);t3=new TextField("",4); //生成文本域并设置长度p.add(new JLabel("Num1"));p.add(t1);p.add(new JLabel("Num2"));p.add(t2);p.add(new JLabel("Res"));p.add(t3);//顺次在面板中加入按钮和文本域t3.setEditable(false); //设置t3不可编辑Panel button=new Panel();button.setLayout(new GridLayout(2,2));//以两行2列来布局button面板中的各组件button.add(b1);button.add(b2);button.add(b3);button.add(b4);getContentPane().add(button,BorderLayout.SOUTH); getContentPane().add(p,BorderLayout.NORTH);b1.addActionListener(this);b2.addActionListener(this);b3.addActionListener(this);b4.addActionListener(this);//注册事件监听器}public void actionPerformed(ActionEvent e){ //实现接口方法double number1=Double.parseDouble(t1.getText());double number2=Double.parseDouble(t2.getText());//得到文本域中的数字字符串调用parseDouble（）函数转化为数值型数字if(e.getSource()==b1){double result=number1+number2;t3.setText(String.valueOf(result));//实现+}if(e.getSource()==b2){double result=number1-number2;t3.setText(String.valueOf(result));//实现-}if(e.getSource()==b3){double result=number1*number2; //实现*t3.setText(String.valueOf(result));}if(e.getSource()==b4) //实现/{double result=number1/number2;t3.setText(String.valueOf(result));}}}public class Calculator{public static void main(String[] args){MyFrame frm=new MyFrame("Welcome to my calculator"); //设置标题frm.setSize(320,240); //设置大小frm. setVisible(true);//可见}}THANKS !!!致力为企业和个人提供合同协议，策划案计划书，学习课件等等打造全网一站式需求欢迎您的下载，资料仅供参考。