J2ME手机游戏引擎程序结构简述

public class GameMIDlet extends MIDlet {
static GameMIDlet instance;
Display display;
GameDisplayable displayable = null;
public GameMIDlet() {
instance = this;
display = Display.getDisplay(this);
displayable = new GameDisplayable();
}
public void startApp() {
display.setCurrent(displayable);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
displayable.running = false;
}
public static void quitApp() {
instance.destroyApp(true);
instance.notifyDestroyed();
instance = null;
}
}
public class GameDisplayable extends FullCanvas implements Runnable {
/** 主控制线程 */
Thread MainThread = null;
/** 游戏时钟间隔 毫秒为单位 */
public static long timeinterval = 20;
public static boolean Isstable = true;
/* 用于游戏时钟的变量 */
public static long timeold = 0;
public static long timenow = 0;
public long interval = 0;
public static long frames_per_second = 0;
int count = 0;
long second = 0;
public static boolean running = true;
　public GameDisplayable() {
// 开始主线程
Thread MainThread = new Thread(this);
MainThread.start();
}
public void run() {
while (running) {
timenow = System.currentTimeMillis();
interval = timenow - timeold;
if (interval >= timeinterval) {
timeold = timenow;
Game_Process();
if (second != (System.currentTimeMillis() / 1000)) {
second = System.currentTimeMillis() / 1000;
frames_per_second = count;
count = 1;
}
else
count++;
}
lib.sleep(30);
}
} 

public class GameMIDlet extends MIDlet {
GameDisplayable displayable = null;
/** 游戏时钟间隔 毫秒为单位 */
public static long timeinterval = 0;
//用于游戏时钟的变量
public static long timeold = 0;
public static long timenow = 0;
public long interval = 0;
public static long frames_per_second=0;
int count=0;
long second =0;
public static boolean running = false;
static boolean exitApp =false;
public GameMIDlet() {
displayable = new GameDisplayable();
running =true;
}
public void startApp() {
running =true;
Display.getDisplay(this).setCurrent(displayable);
while(running) {
timenow = System.currentTimeMillis();
interval = timenow - timeold;
if (interval >= timeinterval) {
timeold = timenow;
displayable.Game_Process();
if(second != (System.currentTimeMillis() /1000)){
second = System.currentTimeMillis()/1000;
frames_per_second = count;
count = 1;
}else
count ++;
}
}
if(exitApp) {
destroyApp(true);
notifyDestroyed();
}
}
public void pauseApp() {
running =false;
}
public void destroyApp(boolean unconditional) {
running = false;
}
public static void quitApp() {
running =false;
exitApp =true;
}
}