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.java
import 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 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;
}
package 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
//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 https://www.wendangku.net/doc/8f11837053.html,.*;
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 https://www.wendangku.net/doc/8f11837053.html,.*;
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 { 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 https://www.wendangku.net/doc/8f11837053.html,.*; 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 /*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 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) { 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(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,https://www.wendangku.net/doc/8f11837053.html,); 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; else return 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; else return false; } else return fale; } JAVA计算器源代码 import java.awt.*; import java.awt.event.*; import https://www.wendangku.net/doc/8f11837053.html,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; 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");
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