哪些网站可以免费下载JAVA源码

哪些网站可以免费下载JAVA源码,第1张

世纪站长网 http://wt.21codes.com/Soft/pro/JAVAcode/

盟动笑举斗碰磨力源码 http://www.tomore.com/java/

365源码之答橘家 http://www.365code.com/sort/353_1.htm

天新网 http://www.21tx.com/src/java/

豆豆源码http://code.ddvip.com/list/257.html

这样的网站多了,去看看吧。

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,有仔衫销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的观塌枯察者

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,负责接收念游用户的 *** 作,并把用户 *** 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 = 0i <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 = 0i <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 = 0i <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

//都是从新手过来的,以下代码供参考

//1.

public class BankAccount {

private static 则冲String acctnum

private static double money

private static void showAcct() {

System.out.println("账号为: " + acctnum)

}

private static void showMoney() {

System.out.println("余额为: " + money)

}

public BankAccount(String acc, double m) {

this.acctnum = acc

this.money 枯盯纳= m

}

public static void main(String[] args) {

BankAccount ba = new BankAccount("626600018888", 5000.00)

ba.showAcct()

ba.showMoney()

}

}

//2.

public class Triangle {

private static float a

private static float b

private static float c

public Triangle(float a, float b, float c) {

this.a = a

this.b = b

this.c = c

}

public static boolean judgeTriangle(float a, float b, float c) {

if ((a > Math.abs(b - c) && a < b + c)

&& (b > Math.abs(a - c) && b < a + c)

&& (c > Math.abs(a - b) && c < a + b))

return true

else

return false

}

public float getCircumference() {

return this.a + this.b + this.c

}

}

//3.

public class TestTriangle {

public static void main(String[] args) 没没{

Triangle t = new Triangle(5.3f,7.8f,9.3f)

if(t.judgeTriangle(5.3f,7.8f,9.3f)){

System.out.print("能够成三角形,周长为: ")

System.out.printf("%9.2f",t.getCircumference())}

else

System.out.println("不能构成三角形")

}

}


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