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java設(shè)計(jì)Bird(鳥),Fish(魚)類,都繼承自Animal(動(dòng)物),實(shí)現(xiàn)其方法printInfo(),輸出
package?animal;
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public?class?Animal?{
String?name="動(dòng)物";
public?void?printInfo(){
System.out.println(name);
}
}
package?animal;
public?class?Bird?extends?Animal{
String?name="bird";
@Override
public?void?printInfo(){
System.out.println("我是："+name);
}
}
package?animal;
public?class?Fish?extends?Animal{
String?name="fish";
@Override
public?void?printInfo(){
System.out.println("我是："+name);
}
}
package animal;
public class Test {
public static void main(String[] args) {
Animal bird=new Bird();
bird.printInfo();
Animal fish=new Fish();
fish.printInfo();
}
}
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飛翔的小鳥怎樣加入背景
你說的如果是javaswing程序，有兩種方法，1、JPanel上放背景；2、JLabel放背景//初始化窗口publicvoidinitFrame(){//利用JPanel添加背景圖片GImage=newJPanel(){protectedvoidpaintComponent(Graphicsg){ImageIconicon=n
Java菜小鳥求教簡(jiǎn)單程序。
你不理解不是因?yàn)榇a的問題，而是你的數(shù)學(xué)能力：
比如給你舉個(gè)例子 888 = 8*100+8*10+8
第一次循環(huán)時(shí) sum = 0+item = 8； 而 item = item*10+a 就賦值為88了
所以第二次循環(huán)的時(shí)候 sum = 8了，那么執(zhí)行sum+item 就是 8 + 88； 并且賦值給sum
并且調(diào)整item = 88*10+a = 880+8，所以item就變?yōu)?88了。
以此類推。每循環(huán)一次把item的階數(shù)（十進(jìn)制）加一再加上8
就算得最后結(jié)果了。
idea中文怎么導(dǎo)出java源代碼
idea中文導(dǎo)出java源代碼方法：
1、進(jìn)入idea，打開項(xiàng)目的projectstructure。
2、鼠標(biāo)右鍵項(xiàng)目名稱，選擇openmodulesettings。
3、點(diǎn)擊菜單fileprojectstructure。
4、在projectstructure中選擇artifacts，點(diǎn)擊add，選擇JARFrommoduleswithdependencies。
5、進(jìn)行相關(guān)的配置，即可導(dǎo)出java源代碼。
當(dāng)前標(biāo)題：飛揚(yáng)小鳥java源代碼 飛翔的小鳥編程
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