什么是java源代碼 怎么查看

你說的java源代碼是指編譯成的class文件前的java文件。

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當(dāng)我們運(yùn)行.java文件時(shí)，它會(huì)被系統(tǒng)編譯成.class文件，例如Test.java編譯之后就是Test.class，

源文件就是指Test.java文件，

一般部署項(xiàng)目時(shí)，有.class文件就可以發(fā)布運(yùn)行了，但是如果想修改這個(gè)系統(tǒng)，.class是不能修改的，要有.java文件才能修改

也可以上網(wǎng)去下反編譯軟件，就是能把.class文件大部分還原成.java文件的工具，但不是100%還原，而且如果不是正版的，小心有毒啊，什么的。

JAVA源程序代碼

您好，寫了一個(gè)程序，求素?cái)?shù)，并將所有素?cái)?shù)存到ArrayList sushu中：

import?java.util.ArrayList;

import?java.util.zip.Inflater;

public?class?sushu?{

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

int?n=50,b=0;

float?a=0,c=0;

ArrayList?sushu=new?ArrayList();

for(int?i=3;i=n;i++){

int?state=0;

for(int?j=2;j(i/2+1);j++){

a=(float)i/(float)j;

//System.out.println(a);

b=(int)a;

//System.out.println(a-b);

c=a-b;

//System.out.println(c);

if(c==0){state=1;break;}

}

if(state==0)sushu.add(i);

}

System.out.println(sushu);

}

}

輸出結(jié)果為：[3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47]

求java小游戲源代碼

表1. CheckerDrag.java

// CheckerDrag.javaimport java.awt.*;import java.awt.event.*;public class CheckerDrag extends java.applet.Applet{ // Dimension of checkerboard square. // 棋盤上每個(gè)小方格的尺寸 final static int SQUAREDIM = 40; // Dimension of checkerboard -- includes black outline. // 棋盤的尺寸 – 包括黑色的輪廓線 final static int BOARDDIM = 8 * SQUAREDIM + 2; // Dimension of checker -- 3/4 the dimension of a square. // 棋子的尺寸 – 方格尺寸的3/4 final static int CHECKERDIM = 3 * SQUAREDIM / 4; // Square colors are dark green or white. // 方格的顏色為深綠色或者白色 final static Color darkGreen = new Color (0, 128, 0); // Dragging flag -- set to true when user presses mouse button over checker // and cleared to false when user releases mouse button. // 拖動(dòng)標(biāo)記 --當(dāng)用戶在棋子上按下鼠標(biāo)按鍵時(shí)設(shè)為true， // 釋放鼠標(biāo)按鍵時(shí)設(shè)為false boolean inDrag = false; // Left coordinate of checkerboard's upper-left corner. // 棋盤左上角的左方向坐標(biāo) int boardx; // Top coordinate of checkerboard's upper-left corner. //棋盤左上角的上方向坐標(biāo) int boardy; // Left coordinate of checker rectangle origin (upper-left corner). // 棋子矩形原點(diǎn)(左上角)的左方向坐標(biāo) int ox; // Top coordinate of checker rectangle origin (upper-left corner). // 棋子矩形原點(diǎn)(左上角)的上方向坐標(biāo) int oy; // Left displacement between mouse coordinates at time of press and checker // rectangle origin. // 在按鍵時(shí)的鼠標(biāo)坐標(biāo)與棋子矩形原點(diǎn)之間的左方向位移 int relx; // Top displacement between mouse coordinates at time of press and checker // rectangle origin. // 在按鍵時(shí)的鼠標(biāo)坐標(biāo)與棋子矩形原點(diǎn)之間的上方向位移 int rely; // Width of applet drawing area. // applet繪圖區(qū)域的寬度 int width; // Height of applet drawing area. // applet繪圖區(qū)域的高度 int height; // Image buffer. // 圖像緩沖 Image imBuffer; // Graphics context associated with image buffer. // 圖像緩沖相關(guān)聯(lián)的圖形背景 Graphics imG; public void init () { // Obtain the size of the applet's drawing area. // 獲取applet繪圖區(qū)域的尺寸 width = getSize ().width; height = getSize ().height; // Create image buffer. // 創(chuàng)建圖像緩沖 imBuffer = createImage (width, height); // Retrieve graphics context associated with image buffer. // 取出圖像緩沖相關(guān)聯(lián)的圖形背景 imG = imBuffer.getGraphics (); // Initialize checkerboard's origin, so that board is centered. // 初始化棋盤的原點(diǎn)，使棋盤在屏幕上居中 boardx = (width - BOARDDIM) / 2 + 1; boardy = (height - BOARDDIM) / 2 + 1; // Initialize checker's rectangle's starting origin so that checker is // centered in the square located in the top row and second column from // the left. // 初始化棋子矩形的起始原點(diǎn)，使得棋子在第一行左數(shù)第二列的方格里居中 ox = boardx + SQUAREDIM + (SQUAREDIM - CHECKERDIM) / 2 + 1; oy = boardy + (SQUAREDIM - CHECKERDIM) / 2 + 1; // Attach a mouse listener to the applet. That listener listens for // mouse-button press and mouse-button release events. // 向applet添加一個(gè)用來監(jiān)聽鼠標(biāo)按鍵的按下和釋放事件的鼠標(biāo)監(jiān)聽器 addMouseListener (new MouseAdapter () { public void mousePressed (MouseEvent e) { // Obtain mouse coordinates at time of press. // 獲取按鍵時(shí)的鼠標(biāo)坐標(biāo) int x = e.getX (); int y = e.getY (); // If mouse is over draggable checker at time // of press (i.e., contains (x, y) returns // true), save distance between current mouse // coordinates and draggable checker origin // (which will always be positive) and set drag // flag to true (to indicate drag in progress). // 在按鍵時(shí)如果鼠標(biāo)位于可拖動(dòng)的棋子上方 // （也就是contains (x, y)返回true），則保存當(dāng)前 // 鼠標(biāo)坐標(biāo)與棋子的原點(diǎn)之間的距離（始終為正值）并且 // 將拖動(dòng)標(biāo)志設(shè)為true（用來表明正處在拖動(dòng)過程中） if (contains (x, y)) { relx = x - ox; rely = y - oy; inDrag = true; } } boolean contains (int x, int y) { // Calculate center of draggable checker. // 計(jì)算棋子的中心位置 int cox = ox + CHECKERDIM / 2; int coy = oy + CHECKERDIM / 2; // Return true if (x, y) locates with bounds // of draggable checker. CHECKERDIM / 2 is the // radius. // 如果(x, y)仍處于棋子范圍內(nèi)則返回true // CHECKERDIM / 2為半徑 return (cox - x) * (cox - x) + (coy - y) * (coy - y) CHECKERDIM / 2 * CHECKERDIM / 2; } public void mouseReleased (MouseEvent e) { // When mouse is released, clear inDrag (to // indicate no drag in progress) if inDrag is // already set. // 當(dāng)鼠標(biāo)按鍵被釋放時(shí)，如果inDrag已經(jīng)為true， // 則將其置為false（用來表明不在拖動(dòng)過程中） if (inDrag) inDrag = false; } }); // Attach a mouse motion listener to the applet. That listener listens // for mouse drag events. //向applet添加一個(gè)用來監(jiān)聽鼠標(biāo)拖動(dòng)事件的鼠標(biāo)運(yùn)動(dòng)監(jiān)聽器 addMouseMotionListener (new MouseMotionAdapter () { public void mouseDragged (MouseEvent e) { if (inDrag) { // Calculate draggable checker's new // origin (the upper-left corner of // the checker rectangle). // 計(jì)算棋子新的原點(diǎn)（棋子矩形的左上角） int tmpox = e.getX () - relx; int tmpoy = e.getY () - rely; // If the checker is not being moved // (at least partly) off board, // assign the previously calculated // origin (tmpox, tmpoy) as the // permanent origin (ox, oy), and // redraw the display area (with the // draggable checker at the new // coordinates). // 如果棋子（至少是棋子的一部分）沒有被 // 移出棋盤，則將之前計(jì)算的原點(diǎn) // (tmpox, tmpoy)賦值給永久性的原點(diǎn)(ox, oy)， // 并且刷新顯示區(qū)域（此時(shí)的棋子已經(jīng)位于新坐標(biāo)上） if (tmpox boardx tmpoy boardy tmpox + CHECKERDIM boardx + BOARDDIM tmpoy + CHECKERDIM boardy + BOARDDIM) { ox = tmpox; oy = tmpoy; repaint (); } } } }); } public void paint (Graphics g) { // Paint the checkerboard over which the checker will be dragged. // 在棋子將要被拖動(dòng)的位置上繪制棋盤 paintCheckerBoard (imG, boardx, boardy); // Paint the checker that will be dragged. // 繪制即將被拖動(dòng)的棋子 paintChecker (imG, ox, oy); // Draw contents of image buffer. // 繪制圖像緩沖的內(nèi)容 g.drawImage (imBuffer, 0, 0, this); } void paintChecker (Graphics g, int x, int y) { // Set checker shadow color. // 設(shè)置棋子陰影的顏色 g.setColor (Color.black); // Paint checker shadow. // 繪制棋子的陰影 g.fillOval (x, y, CHECKERDIM, CHECKERDIM); // Set checker color. // 設(shè)置棋子顏色 g.setColor (Color.red); // Paint checker. // 繪制棋子 g.fillOval (x, y, CHECKERDIM - CHECKERDIM / 13, CHECKERDIM - CHECKERDIM / 13); } void paintCheckerBoard (Graphics g, int x, int y) { // Paint checkerboard outline. // 繪制棋盤輪廓線 g.setColor (Color.black); g.drawRect (x, y, 8 * SQUAREDIM + 1, 8 * SQUAREDIM + 1); // Paint checkerboard. // 繪制棋盤 for (int row = 0; row 8; row++) { g.setColor (((row 1) != 0) ? darkGreen : Color.white); for (int col = 0; col 8; col++) { g.fillRect (x + 1 + col * SQUAREDIM, y + 1 + row * SQUAREDIM, SQUAREDIM, SQUAREDIM); g.setColor ((g.getColor () == darkGreen) ? Color.white : darkGreen); } } } // The AWT invokes the update() method in response to the repaint() method // calls that are made as a checker is dragged. The default implementation // of this method, which is inherited from the Container class, clears the // applet's drawing area to the background color prior to calling paint(). // This clearing followed by drawing causes flicker. CheckerDrag overrides // update() to prevent the background from being cleared, which eliminates // the flicker. // AWT調(diào)用了update()方法來響應(yīng)拖動(dòng)棋子時(shí)所調(diào)用的repaint()方法。該方法從 // Container類繼承的默認(rèn)實(shí)現(xiàn)會(huì)在調(diào)用paint()之前，將applet的繪圖區(qū)域清除 // 為背景色，這種繪制之后的清除就導(dǎo)致了閃爍。CheckerDrag重寫了update()來 // 防止背景被清除，從而消除了閃爍。 public void update (Graphics g) { paint (g); }}

跪求JAVA編寫的小游戲源代碼

import java.awt.*;

import java.applet.*;

import java.awt.event.*;

import java.awt.image.*;

import java.awt.geom.*;

import java.util.*;

class Car{

Image img;

int x, y;

Dimension dim;

Car(Image img){

this.img=img;

}

Car(Image img, int x, int y){

this.img=img; this.x=x; this.y=y;

}

Car(Image img, int x, int y, Dimension dim){

this(img, x, y);

this.dim=dim;

}

void draw(Graphics g, ImageObserver observer){

g.drawImage(img, x, y, observer);

}

int getX(){ return x;}

int getY(){ return y;}

void setX(int x){this.x=x;}

void setY(int y){this.y=y;}

void setLocation(int x, int y){

this.x=x; this.y=y;

}

int getWidth(){ return img.getWidth(null);}

int getHeight(){ return img.getHeight(null);}

Rectangle2D getRectangle(){

return new Rectangle2D.Float(x, y, getWidth(), getHeight());

}

void move(int dx, int dy){

x+=dx;

y+=dy;

if(dim!=null){

if(x0)x=0;

if(x+getWidth()dim.getWidth())

x=(int)dim.getWidth()-getWidth();

}

}

boolean intersects(Car car){

return getRectangle().intersects(car.getRectangle());

}

boolean intersects(int x, int y){

return getRectangle().intersects(x, y, getWidth(), getHeight());

}

}

public class CarRace extends Applet implements KeyListener, Runnable{

Image buff;

Canvas screen;

Graphics2D gs, gb;

Car redCar;

Car[] enemy=new Car[20];

Button bStart;

Thread game;

boolean loop=true;

Dimension dim=new Dimension(200, 300);

int road;

Random rnd=new Random();

public void init(){

prepareResource();

setBackground(Color.blue);

initScreen();

add(screen);

bStart=new Button("霸烙 矯累");

add(bStart);

bStart.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent ae){

screen.requestFocus();

if(!game.isAlive())

game.start();

}

});

}

void prepareResource(){

Image imgRed=getImage(getCodeBase(),"images/red_car.gif");

Image imgBlue=getImage(getCodeBase(),"images/blue_car.gif");

Image imgGreen=getImage(getCodeBase(),"images/green_car.gif");

MediaTracker mt=new MediaTracker(this);

try{

mt.addImage(imgRed, 0);

mt.addImage(imgBlue, 1);

mt.addImage(imgGreen, 2);

mt.waitForAll();

}catch(Exception e){}

buff=createImage((int)dim.getWidth(), (int)dim.getHeight());

gb=(Graphics2D)buff.getGraphics();

redCar=new Car(imgRed, 80,250, dim);

for(int i=0;i10;i++){

enemy[i]=new Car(imgBlue, 0, 0);

}

for(int i=10;ienemy.length;i++){

enemy[i]=new Car(imgGreen, 0, 0);

}

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

setEnemy(i);

}

game=new Thread(this);

}

public void stop(){

loop=false;

}

public void run(){

while(loop){

drawScreen();

try{ Thread.sleep(50);}catch(Exception e){}

}

}

void initScreen(){

screen=new Canvas(){

public void paint(Graphics g){

if(gs==null){

gs=(Graphics2D)screen.getGraphics();

}

drawScreen();

}

};

screen.setSize(dim);

screen.addKeyListener(this);

}

void setEnemy(int en){

int x, y;

next:while(true){

x=rnd.nextInt((int)dim.getWidth()-enemy[en].getWidth());

y=-rnd.nextInt(5000)-200;

for(int j=0;jenemy.length;j++){

if(j!=en enemy[j].intersects(x, y))continue next;

}

enemy[en].setLocation(x, y);

break;

}

}

void check(Car en){

if(redCar.intersects(en)){

if(redCar.getX()en.getX()){

en.move(-20, 0);

redCar.move(20, 0);

}

else{

en.move(20,0);

redCar.move(-20, 0);

}

}

}

synchronized void drawScreen(){

gb.clearRect(0, 0, (int)dim.getWidth(), (int)dim.getHeight());

gb.setPaint(new Color(100, 100, 100));

gb.fillRect(0, 0, (int)dim.getWidth(), (int)dim.getHeight());

drawRoad();

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

enemy[i].move(0, 15);

enemy[i].draw(gb, screen);

if(enemy[i].getY()dim.getHeight())

setEnemy(i);

check(enemy[i]);

}

redCar.draw(gb, screen);

gs.drawImage(buff, 0,0, screen);

}

void drawRoad(){

road+=80;

gb.setPaint(Color.yellow);

gb.fillRect((int)dim.getWidth()/2, road,10,150);

if(road=dim.getHeight())road=-150;

}

public void keyPressed(KeyEvent ke){

if(ke.getKeyCode()==KeyEvent.VK_LEFT){

redCar.move(-10,0);

}

else if(ke.getKeyCode()==KeyEvent.VK_RIGHT){

redCar.move(10,0);

}

}

public void keyReleased(KeyEvent ke){}

public void keyTyped(KeyEvent ke){}

}

這個(gè)是一個(gè)典型的Applet,文件名應(yīng)該是CarRace.java,需要圖片作為車子等等,本人也是別人給的,但是還要個(gè).html文件來運(yùn)行它,代碼為:

Applet code="CarRace.class" width=250 height=350

/Applet

請(qǐng)樓主采納

java新手,求完整的源代碼

//都是從新手過來的，以下代碼供參考

//1.

public?class?BankAccount?{

private?static?String?acctnum;

private?static?double?money;

private?static?void?showAcct()?{

System.out.println("賬號(hào)為:?"?+?acctnum);

}

private?static?void?showMoney()?{

System.out.println("余額為:?"?+?money);

}

public?BankAccount(String?acc,?double?m)?{

this.acctnum?=?acc;

this.money?=?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)?{

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

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

System.out.print("能夠成三角形，周長為:?");

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

else

System.out.println("不能構(gòu)成三角形");

}

}