如何从paint方法外部创建一个方法，然后在paint中调用它？

Question

public class window extends JPanel{
    public void paint(){
        //draw stuff
    }
}

//In another file

public class Hero{
    public void draw(){
        //i want to draw the hero using fillRect or other stuff
    }
}

这是如何完成的（如果可能的话）？