import javax.microedition.midlet.MIDlet;import javax.microedition.lcdui.*; //made by sword2008·程序之巢//游戏第一课  画格子public class Gofirst1 extends MIDlet{  public Gofirst1(){            } public void startApp(){  Display.getDisplay(this).setCurrent(new First1());         } public void pauseApp(){} public void destroyApp(boolean unkown){}     } class First1 extends Canvas{  private int color;   private int forOneTime=0; private Graphics g;  private int startX=getWidth()/4-40;//起点坐标和终点坐标非常重要，格子剩下的是分成等分 private int startY=getHeight()/4-40; private int nowX=startX,nowY=startY;      public void paint(Graphics g){ if(forOneTime==0){  color=g.getColor(); g.setColor(255,255,255); g.fillRect(0,0,getWidth(),getHeight()); g.setColor(255,0,0); g.drawRect(startX,startY,200,200); drawline(g);    }else if(forOneTime==1){//fireg.setColor(0,255,0);g.fillRect(nowX,nowY,20,20);long memory = (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory());System.gc();System.out.println("当前占用内存:"+memory);}//fillRect()(起点坐标,终点坐标,横坐标,竖坐标)else if(forOneTime==2){//down nowY+=20;//竖坐标加20,以下依此类推ifmaxmingolong();g.fillRect(nowX,nowY,20,20);   }else if(forOneTime==3){//up        nowY-=20;ifmaxmingolong();g.fillRect(nowX,nowY,20,20);   }else if(forOneTime==4){//left nowX-=20;ifmaxmingolong();g.fillRect(nowX,nowY,20,20);   }else if(forOneTime==5){//right nowX+=20;ifmaxmingolong();g.fillRect(nowX,nowY,20,20);   }          }    private void  drawline(Graphics g)//画格子 {    for(int i=1;i<11;i++){//横线 x坐标不边,y分别分成10等分,从上画下, g.drawLine(startX,startY+200/10*i,startX+200,startY+200/10*i);     //竖线 g.drawLine(startX+200/10*i,startY,startX+200/10*i,startY+200);       } }//填充  private void fillline(){} //调整越界坐标private void ifmaxmingolong(){if(nowX<startX){nowX+=20;}if(nowY<startY){nowY+=20;}if(nowX>startX+180){nowX-=20;}if(nowY>startY+180){nowY-=20;}} //key   public void keyPressed(int Keycode){//k小写 int action=this.getGameAction(Keycode); switch(action){ case Canvas.FIRE:forOneTime=1;repaint();break; case Canvas.DOWN:forOneTime=2;repaint();break;  case Canvas.UP:  forOneTime=3;repaint();break; case Canvas.LEFT:forOneTime=4;repaint();break; case Canvas.RIGHT:forOneTime=5;repaint();break; default:break;       }         }   }  

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