最近看了面向對象的一些知識，然後跟著老師的講解做了一個太陽系各行星繞太陽轉的小遊戲，來練習鞏固一下最近學的知識：
用到知識點：類的繼承、方法的重載與重寫、多態、封裝等
分析：
1.需要加載圖片、畫圖
2.建一個面板，主頁面
3.行星類
效果圖：
先看一下源碼結構圖：
現在逐步分析各個類的功能：
1)工具類-----util包中
--Constant類封裝了遊戲中用到的常量
--GameUtil類封裝了遊戲的圖片加載功能
--MyFrame類封裝了遊戲面板的構造，用於各面板的父類
------之所以這樣做，目的是為了封裝數據，便於程序的擴充
Constant.java
package util; public class Constant { public static final int GAME_WIDTH = 800; public static final int GAME_HEIGHT = 600; } GameUtil.java
package util; import java.awt.Image; import java.awt.image.BufferedImage; import java.io.IOException; import java.net.URL; import javax.imageio.ImageIO; /** * 工具類（加載圖片） * @author long * */ public class GameUtil { private GameUtil(){ } //工具類通常將構造方法私有public static Image getImage(String path){ URL u = GameUtil.class.getClassLoader().getResource(path) ; BufferedImage img = null; try { img = ImageIO.read(u); } catch (IOException e) { e.printStackTrace(); } return img; } } MyFrame.java
package util; import javax.swing.JFrame; import javax.swing.JPanel; /** * 遊戲面板的父類* @author long * */ public class MyFrame extends JPanel{ /** * 加載Frame的方法*/ public void launchFrame(){ JFrame frame = new JFrame("MyGame"); frame.add(this); frame.setSize(Constant.GAME_WIDTH,Constant.GAME_HEIGHT); frame.setAlwaysOnTop(true); // 設置其總在最上frame.setLocationRelativeTo(null); // 設置窗體初始位置frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); new PaintThread().start(); } /** * 定義一個重畫窗口的線程類，是一個內部類* @author dell * */ class PaintThread extends Thread { public void run(){ while(true){ repaint(); try { Thread.sleep(40); //1s = 1000ms } catch (InterruptedException e) { e.printStackTrace(); } } } } public static void main(String[] args) { new MyFrame().launchFrame(); } } 2)主要的事件處理類---solar包中
--Planet類行星類繼承至Star類
--SolarFrame類游戲主面板類繼承至MyFrame類
--Star類星球類，各個星球的父類
--Test類測試類，不需要說明
Planet.java
package solar; import java.awt.Color; import java.awt.Graphics; import java.awt.Image; import util.GameUtil; /** * 行星類，繼承至Star類* @author long * */ public class Planet extends Star{ //除了圖片、坐標，行星沿著橢圓運行：長軸、短軸、移動速度、旋轉角度。繞著某個star運行double longAxis; //橢圓長軸double shortAxis; //橢圓短軸double speed; //飛行速度double degree; //旋轉角度Star center; //圍繞行星public void draw(Graphics g) { //g.drawImage(img, (int)x, (int)y, null); super.draw(g); drawTrace(g); move(); } public void drawTrace(Graphics g){ double traceX, traceY,traceWidth,traceHeight; traceX = (center.x+center.w/2)-longAxis; traceY = (center.y+center.h/2)-shortAxis; traceWidth = 2*longAxis; traceHeight = 2*shortAxis; Color c = g.getColor(); g.setColor(Color.blue); g.drawOval((int)traceX, (int)traceY, (int)traceWidth, (int)traceHeight); g.setColor(c); } public void move(){ //沿著橢圓軌跡飛行x = center.x + longAxis * Math.cos(degree); y = center.y + shortAxis * Math.sin(degree); degree += speed; } public Planet(Image img,double x,double y){ super(img,x,y); } public Planet(String imgpath,double x,double y){ super(imgpath,x,y); } public Planet( Star center,Image img,double longAxis, double shortAxis,double speed) { super(); this.x = (center.x+center.w/2) + longAxis; this.y = (center.y+center.h/ 2) + shortAxis; this.img = img; this.longAxis = longAxis; this.shortAxis = shortAxis; this.speed = speed; this.center = center; } public Planet( Star center,String imgPath,double longAxis, double shortAxis ,double speed) { this(center,GameUtil.getImage(imgPath),longAxis,shortAxis,speed); } }SolarFrame.java
package solar; import java.awt.Graphics; import java.awt.Image; import util.Constant; import util.GameUtil; import util.MyFrame; public class SolarFrame extends MyFrame{ int width = Constant.GAME_WIDTH/2; int height = Constant.GAME_HEIGHT/2; Image bg=GameUtil.getImage("images/bg.png"); Star sun = new Star("images/sun.jpg",width,height); Planet earth = new Planet(sun," images/earth.png",100,60,0.1); Planet mars = new Planet(sun,"images/mars.png",180,100,0.15); @Override public void paint(Graphics g) { g.drawImage(bg , 0, 0, null); sun.draw(g); earth.draw(g); mars.draw(g); } public static void main(String[] args) { new SolarFrame().launchFrame(); } }Star.java
package solar; import java.awt.Graphics; import java.awt.Image; import util.GameUtil; public class Star { public Image img; public double x,y; int w,h; public void draw(Graphics g){ g .drawImage(img, (int)x, (int)y, null); } public Star(){ } public Star(Image img){ this.img = img; this.w = img.getWidth(null); this .h = img.getHeight(null); } public Star(Image img,double x,double y){ this(img); this.x = x; this.y = y; } public Star(String imgPath,double x ,double y){ this(GameUtil.getImage(imgPath),x,y); } }總結：該小遊戲對代碼的封裝處理的比較好，便於程序的擴充，體現了面向對象的強大，不同的功能封裝在不同的類與方法中，把類的公共的部分封裝在父類中，提高代碼的重用性。前期各個類寫的過程中會有各種小問題與細節，但處理完這些後，後期想擴充行星的個數就比較簡單了，new一個行星對象，然後畫的面板上即可。面向對像水太深，這只是初步小涉獵，仍需繼續努力專研！ ！ ！
以上就是Java太陽系小遊戲分析和源碼詳解，希望對大家學習java語言有所幫助。