谁帮我看一下这代码那里错了

class MyCanvas extends Canvas{

private Image picture;

public MyCanvas(){

try{
picture=Image.createImage("/T.png");}

catch (IOException e) { e.printStackTrace();}
}
protected void paint(Graphics g ) {

g.drawImage(picture,120,127,Graphics.HCENTER|Graphics.VCENTER);
}
}

picture=Image.createImage("/T.png");}
如果这里失败
那么
g.drawImage(picture,120,127,Graphics.HCENTER|Graphics.VCENTER);
就会出错

protected void paint(Graphics g ) {
if (picture != null) {
  g.drawImage(picture,120,127,Graphics.HCENTER|Graphics.VCENTER);
} else {
  g.drawString("error",120,127);
}
}