J2ME中物体移动

相关代码如下

public void paint(Graphics g)
{
g.setColor(20,50,60);
g.fillRect(0, 0, this.getWidth(), this.getHeight());
g.drawImage(img, x, y, g.LEFT|g.TOP);

}

protected void keyPressed(int keyCode)
{int code_1=this.getGameAction(keyCode);
if ((code_1&Canvas.DOWN)!=0&&y<100){y+=5;}
if ((code_1&Canvas.UP)!=0&&y>0){y-=5;}
if ((code_1&Canvas.LEFT)!=0&&x>0){x-=5;}
if ((code_1&Canvas.RIGHT)!=0&&x<100){x+=5;}


repaint();
}
X为横坐标，Y为纵坐标！在模拟器上面运行的时候，我按“上”键，图向右上方移动，按“左”，图向左下方移动，“右”“下”两个键是对的，没有出现其他情况

建议采用 switch 语句..:

如下:

public void keyPressed(int keyCode){
switch(this.getGameAction(keyCode)){
case Canvas.UP:
if(y<100)
y-=5;
break;
case Canvas.DOWN:
if(y>100)
y-=5;
break;
case Canvas.LEFT:
if(x>0)
y-=5;
break;
case Canvas.RIGHT:
if(x<100)
x-=5;
break;
}
}

你的if后面加个else就行了