java经典小程序源代码 开源的小程序源码

谁能给个JAVA的小程序代码,越小越好!

这是我晓得的最简单的java小程序代码了你可以看看:

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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() {

}

}

求一段JAVA编写的贪吃蛇小程序源代码

用MVC方式实现的贪吃蛇游戏,共有4个类。运行GreedSnake运行即可。主要是观察者模式的使用,我已经添加了很多注释了。

1、

/*

* 程序名称:贪食蛇

* 原作者:BigF

* 修改者:algo

* 说明:我以前也用C写过这个程序,现在看到BigF用Java写的这个,发现虽然作者自称是Java的初学者,

* 但是明显编写程序的素养不错,程序结构写得很清晰,有些细微得地方也写得很简洁,一时兴起之

* 下,我认真解读了这个程序,发现数据和表现分开得很好,而我近日正在学习MVC设计模式,

* 因此尝试把程序得结构改了一下,用MVC模式来实现,对源程序得改动不多。

* 我同时也为程序增加了一些自己理解得注释,希望对大家阅读有帮助。

*/

package mvcTest;

/**

* @author WangYu

* @version 1.0

* Description:

* /pre

* Create on :Date :2005-6-13 Time:15:57:16

* LastModified:

* History:

*/

public class GreedSnake {

public static void main(String[] args) {

SnakeModel model = new SnakeModel(20,30);

SnakeControl control = new SnakeControl(model);

SnakeView view = new SnakeView(model,control);

//添加一个观察者,让view成为model的观察者

model.addObserver(view);

(new Thread(model)).start();

}

}

-------------------------------------------------------------

2、

package mvcTest;

//SnakeControl.java

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

/**

* MVC中的Controler,负责接收用户的操作,并把用户操作通知Model

*/

public class SnakeControl implements KeyListener{

SnakeModel model;

public SnakeControl(SnakeModel model){

this.model = model;

}

public void keyPressed(KeyEvent e) {

int keyCode = e.getKeyCode();

if (model.running){ // 运行状态下,处理的按键

switch (keyCode) {

case KeyEvent.VK_UP:

model.changeDirection(SnakeModel.UP);

break;

case KeyEvent.VK_DOWN:

model.changeDirection(SnakeModel.DOWN);

break;

case KeyEvent.VK_LEFT:

model.changeDirection(SnakeModel.LEFT);

break;

case KeyEvent.VK_RIGHT:

model.changeDirection(SnakeModel.RIGHT);

break;

case KeyEvent.VK_ADD:

case KeyEvent.VK_PAGE_UP:

model.speedUp();

break;

case KeyEvent.VK_SUBTRACT:

case KeyEvent.VK_PAGE_DOWN:

model.speedDown();

break;

case KeyEvent.VK_SPACE:

case KeyEvent.VK_P:

model.changePauseState();

break;

default:

}

}

// 任何情况下处理的按键,按键导致重新启动游戏

if (keyCode == KeyEvent.VK_R ||

keyCode == KeyEvent.VK_S ||

keyCode == KeyEvent.VK_ENTER) {

model.reset();

}

}

public void keyReleased(KeyEvent e) {

}

public void keyTyped(KeyEvent e) {

}

}

-------------------------------------------------------------

3、

/*

*

*/

package mvcTest;

/**

* 游戏的Model类,负责所有游戏相关数据及运行

* @author WangYu

* @version 1.0

* Description:

* /pre

* Create on :Date :2005-6-13 Time:15:58:33

* LastModified:

* History:

*/

//SnakeModel.java

import javax.swing.*;

import java.util.Arrays;

import java.util.LinkedList;

import java.util.Observable;

import java.util.Random;

/**

* 游戏的Model类,负责所有游戏相关数据及运行

*/

class SnakeModel extends Observable implements Runnable {

boolean[][] matrix; // 指示位置上有没蛇体或食物

LinkedList nodeArray = new LinkedList(); // 蛇体

Node food;

int maxX;

int maxY;

int direction = 2; // 蛇运行的方向

boolean running = false; // 运行状态

int timeInterval = 200; // 时间间隔,毫秒

double speedChangeRate = 0.75; // 每次得速度变化率

boolean paused = false; // 暂停标志

int score = 0; // 得分

int countMove = 0; // 吃到食物前移动的次数

// UP and DOWN should be even

// RIGHT and LEFT should be odd

public static final int UP = 2;

public static final int DOWN = 4;

public static final int LEFT = 1;

public static final int RIGHT = 3;

public SnakeModel( int maxX, int maxY) {

this.maxX = maxX;

this.maxY = maxY;

reset();

}

public void reset(){

direction = SnakeModel.UP; // 蛇运行的方向

timeInterval = 200; // 时间间隔,毫秒

paused = false; // 暂停标志

score = 0; // 得分

countMove = 0; // 吃到食物前移动的次数

// initial matirx, 全部清0

matrix = new boolean[maxX][];

for (int i = 0; i maxX; ++i) {

matrix[i] = new boolean[maxY];

Arrays.fill(matrix[i], false);

}

// initial the snake

// 初始化蛇体,如果横向位置超过20个,长度为10,否则为横向位置的一半

int initArrayLength = maxX 20 ? 10 : maxX / 2;

nodeArray.clear();

for (int i = 0; i initArrayLength; ++i) {

int x = maxX / 2 + i;//maxX被初始化为20

int y = maxY / 2; //maxY被初始化为30

//nodeArray[x,y]: [10,15]-[11,15]-[12,15]~~[20,15]

//默认的运行方向向上,所以游戏一开始nodeArray就变为:

// [10,14]-[10,15]-[11,15]-[12,15]~~[19,15]

nodeArray.addLast(new Node(x, y));

matrix[x][y] = true;

}

// 创建食物

food = createFood();

matrix[food.x][food.y] = true;

}

public void changeDirection(int newDirection) {

// 改变的方向不能与原来方向同向或反向

if (direction % 2 != newDirection % 2) {

direction = newDirection;

}

}

/**

* 运行一次

* @return

*/

public boolean moveOn() {

Node n = (Node) nodeArray.getFirst();

int x = n.x;

int y = n.y;

// 根据方向增减坐标值

switch (direction) {

case UP:

y--;

break;

case DOWN:

y++;

break;

case LEFT:

x--;

break;

case RIGHT:

x++;

break;

}

// 如果新坐标落在有效范围内,则进行处理

if ((0 = x x maxX) (0 = y y maxY)) {

if (matrix[x][y]) { // 如果新坐标的点上有东西(蛇体或者食物)

if (x == food.x y == food.y) { // 吃到食物,成功

nodeArray.addFirst(food); // 从蛇头赠长

// 分数规则,与移动改变方向的次数和速度两个元素有关

int scoreGet = (10000 - 200 * countMove) / timeInterval;

score += scoreGet 0 ? scoreGet : 10;

countMove = 0;

food = createFood(); // 创建新的食物

matrix[food.x][food.y] = true; // 设置食物所在位置

return true;

} else // 吃到蛇体自身,失败

return false;

} else { // 如果新坐标的点上没有东西(蛇体),移动蛇体

nodeArray.addFirst(new Node(x, y));

matrix[x][y] = true;

n = (Node) nodeArray.removeLast();

matrix[n.x][n.y] = false;

countMove++;

return true;

}

}

return false; // 触到边线,失败

}

public void run() {

running = true;

while (running) {

try {

Thread.sleep(timeInterval);

} catch (Exception e) {

break;

}

if (!paused) {

if (moveOn()) {

setChanged(); // Model通知View数据已经更新

notifyObservers();

} else {

JOptionPane.showMessageDialog(null,

"you failed",

"Game Over",

JOptionPane.INFORMATION_MESSAGE);

break;

}

}

}

running = false;

}

private Node createFood() {

int x = 0;

int y = 0;

// 随机获取一个有效区域内的与蛇体和食物不重叠的位置

do {

Random r = new Random();

x = r.nextInt(maxX);

y = r.nextInt(maxY);

} while (matrix[x][y]);

return new Node(x, y);

}

public void speedUp() {

timeInterval *= speedChangeRate;

}

public void speedDown() {

timeInterval /= speedChangeRate;

}

public void changePauseState() {

paused = !paused;

}

public String toString() {

String result = "";

for (int i = 0; i nodeArray.size(); ++i) {

Node n = (Node) nodeArray.get(i);

result += "[" + n.x + "," + n.y + "]";

}

return result;

}

}

class Node {

int x;

int y;

Node(int x, int y) {

this.x = x;

this.y = y;

}

}

------------------------------------------------------------

4、

package mvcTest;

//SnakeView.java

import javax.swing.*;

import java.awt.*;

import java.util.Iterator;

import java.util.LinkedList;

import java.util.Observable;

import java.util.Observer;

/**

* MVC模式中得Viewer,只负责对数据的显示,而不用理会游戏的控制逻辑

*/

public class SnakeView implements Observer {

SnakeControl control = null;

SnakeModel model = null;

JFrame mainFrame;

Canvas paintCanvas;

JLabel labelScore;

public static final int canvasWidth = 200;

public static final int canvasHeight = 300;

public static final int nodeWidth = 10;

public static final int nodeHeight = 10;

public SnakeView(SnakeModel model, SnakeControl control) {

this.model = model;

this.control = control;

mainFrame = new JFrame("GreedSnake");

Container cp = mainFrame.getContentPane();

// 创建顶部的分数显示

labelScore = new JLabel("Score:");

cp.add(labelScore, BorderLayout.NORTH);

// 创建中间的游戏显示区域

paintCanvas = new Canvas();

paintCanvas.setSize(canvasWidth + 1, canvasHeight + 1);

paintCanvas.addKeyListener(control);

cp.add(paintCanvas, BorderLayout.CENTER);

// 创建底下的帮助栏

JPanel panelButtom = new JPanel();

panelButtom.setLayout(new BorderLayout());

JLabel labelHelp;

labelHelp = new JLabel("PageUp, PageDown for speed;", JLabel.CENTER);

panelButtom.add(labelHelp, BorderLayout.NORTH);

labelHelp = new JLabel("ENTER or R or S for start;", JLabel.CENTER);

panelButtom.add(labelHelp, BorderLayout.CENTER);

labelHelp = new JLabel("SPACE or P for pause", JLabel.CENTER);

panelButtom.add(labelHelp, BorderLayout.SOUTH);

cp.add(panelButtom, BorderLayout.SOUTH);

mainFrame.addKeyListener(control);

mainFrame.pack();

mainFrame.setResizable(false);

mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

mainFrame.setVisible(true);

}

void repaint() {

Graphics g = paintCanvas.getGraphics();

//draw background

g.setColor(Color.WHITE);

g.fillRect(0, 0, canvasWidth, canvasHeight);

// draw the snake

g.setColor(Color.BLACK);

LinkedList na = model.nodeArray;

Iterator it = na.iterator();

while (it.hasNext()) {

Node n = (Node) it.next();

drawNode(g, n);

}

// draw the food

g.setColor(Color.RED);

Node n = model.food;

drawNode(g, n);

updateScore();

}

private void drawNode(Graphics g, Node n) {

g.fillRect(n.x * nodeWidth,

n.y * nodeHeight,

nodeWidth - 1,

nodeHeight - 1);

}

public void updateScore() {

String s = "Score: " + model.score;

labelScore.setText(s);

}

public void update(Observable o, Object arg) {

repaint();

}

}

希望采纳

求java经典小程序代码

代码如下:

public class HelloWorld {

public static void main(String []args) {

int a = 3, b = 7 ;

 System.out.println("Hello World!");

}

public static int f(int a, int b){

return a*a + a*b + b*b;

}

}

结果如下:

求JAVA大神给我发一段完整可运行的java图形小程序的代码(不用太多类),谢谢了

/*计算器*/

import java.awt.*;

import javax.swing.*;

import javax.swing.border.*;

import java.awt.event.*;

public class Calculator implements ActionListener{

JFrame frame;

JPanel panel;

JTextField tfShow;/*定义显示文本框*/

JButton b1[]=new JButton[10]; /*数字按钮*/

JButton b2[]=new JButton[6]; /*操作按钮*/

boolean isNumber;/*判断是否输入多位数字的变量*/

double number;/*存储输入数值、显示结果的变量*/

double result;/*存储中间运算结果的变量*/

char operator;/*存储当前操作符的成员变量*/

public Calculator(){

frame=new JFrame("计算器");

frame.setSize(300,300);/*指定框架窗口的大小*/

frame.setResizable(false);/*使框架窗口不可改变大小*/

JPanel contentPane=(JPanel)frame.getContentPane();

contentPane.setBorder(new EmptyBorder(20,20,20,20));/*绘制框架的指定大小的空透明边框*/

tfShow=new JTextField("0",25);/*指定属性的文本域*/

tfShow.setHorizontalAlignment(JTextField.RIGHT);/*设置文本域中文本的对齐方式*/

isNumber=true;/*初始值设置*/

number=0;/*初始值设置*/

result=0;/*初始值设置*/

operator=' ';/*初始值设置*/

for(int i=0;ib1.length;i++){

b1[i]=new JButton(Integer.toString(i));/*创建数字按钮*/

b1[i].setActionCommand(Integer.toString(i));

b1[i].addActionListener(this);

b1[i].setForeground(Color.blue);

}

String bs[]={"/","*","-","C","+","="};

for(int i=0;ib2.length;i++){

b2[i]=new JButton(bs[i]);/*创建操作按钮*/

b2[i].setActionCommand(bs[i]);

b2[i].addActionListener(this);

b2[i].setForeground(Color.red);

}

panel=new JPanel();

panel.setLayout(new GridLayout(4,5));

panel.add(b1[1]);

panel.add(b1[2]);

panel.add(b1[3]);

panel.add(b2[0]);

panel.add(b1[4]);

panel.add(b1[5]);

panel.add(b1[6]);

panel.add(b2[1]);

panel.add(b1[7]);

panel.add(b1[8]);

panel.add(b1[9]);

panel.add(b2[2]);

panel.add(b1[0]);

panel.add(b2[3]);

panel.add(b2[4]);

panel.add(b2[5]);

frame.add(tfShow,BorderLayout.NORTH);/*将文本框放置在框架上方*/

frame.add(panel,BorderLayout.CENTER);/*将装有按钮组的panel放在框架的中心*/

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);/*设置框架窗口的默认窗口关闭操作*/

frame.setVisible(true);/*设置框架可见*/

}

public double getDisplay(){/*返回要显示的结果*/

return number;

}

public void reDisplay(){/*刷新文本域的内容*/

tfShow.setText(""+getDisplay());

}

/*对输入数字的处理*/

public void numberProcess(int num){

if(isNumbernum!=0){

String s1=Integer.toString(num);

String s2=Integer.toString((int)(this.number));

this.number=Double.parseDouble(s2+s1);/*对多位数字的处理*/

}else{

this.number=num;

}

isNumber=true;/*输入连续数字(即多位数字)时为真*/

public void operationProcess(char operator){/*根据输入的操作符改变当前操作符*/

switch(operator){

case '-':

this.operator='-';

break;

case '+':

this.operator='+';

break;

case '*':

this.operator='*';

break;

case '/':

this.operator='/';

break;

}

result=number;

isNumber=false;/*输入操作符时表示输入连续数字的标记变量为假*/

public void clear(){

number=0;

result=0;

}  

public void equal(){/*计算运算结果*/

switch(operator){

case '-':

result=result-number;

break;

case '+':

result=result+number;

break;

case '*':

result=result*number;

break;

case '/':

result=result/number;

break;

case ' ':

result=number;

break;

}

number=result; /*把运算结果赋值给显示变量*/

isNumber=false;

operator=' '; 

public static void main(String args[]){

Calculator cal=new Calculator();/*创建计算器*/

}

public void actionPerformed(ActionEvent e){

String command=e.getActionCommand();/*获取按钮激发的操作事件的命令名称*/

char c=command.charAt(0);/*将按钮命令名称的第一个字符赋值给一个字符c*/

switch(c){

case '1':

case '2':

case '3':

case '4':

case '5':

case '6':

case '7':

case '8':

case '9':

case '0':

int number=Integer.parseInt(command);

numberProcess(number);/*输入数字的处理*/

break;

case '+':

case '-':

case '*':

case '/':

operationProcess(c);/*算数运算符的处理*/

break;

case '=':equal();break;/*计算运算结果*/

case 'C':clear();break;/*清零*/

}

reDisplay(); /*在文本域中显示信息*/

}

}

运行截图:


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