静态方法调用子类实例的静态方法

class TestStaticInvoke
{
	static void doStuff( Shape s ){
		s.draw();
	}
	public static void main( String [] args ){
		Circle c = new Circle();
		Triangle t = new Triangle();
		Line l = new Line();
		doStuff(c);
		doStuff(t);
		doStuff(l);
		
		Shape s = new Circle();
		doStuff(s);
		s.draw();
		
		Circle c2 = new Circle();
		c2.draw();
	}
}
class Shape
{
	static void draw(){ System.out.println("Shape Drawing"); }
}
class Circle extends Shape
{
	static void draw(){ System.out.println("Draw Circle"); }
}

class Triangle extends Shape
{
	static void draw(){ System.out.println("Draw Three Lines"); }
}

class Line extends Shape
{
	static void draw(){ System.out.println("Draw Line"); }
}

运行结果：

Shape Drawing
Shape Drawing
Shape Drawing
Shape Drawing
Shape Drawing
Draw Circle
请按任意键继续.

class TestVirtualInvoke
{
	static void doStuff( Shape s ){
		s.draw();
	}

	public static void main( String [] args ){
		Circle c = new Circle();
		Triangle t = new Triangle();
		Line l = new Line();
		doStuff(c);
		doStuff(t);
		doStuff(l);
	}
}
class Shape
{
	void draw(){ System.out.println("Shape Drawing"); }
}
class Circle extends Shape
{
	void draw(){ System.out.println("Draw Circle"); }
}

class Triangle extends Shape
{
	void draw(){ System.out.println("Draw Three Lines"); }
}

class Line extends Shape
{
	void draw(){ System.out.println("Draw Line"); }
}

运行结果

Draw Circle
Draw Three Lines
Draw Line
请按任意键继续. . .

 

结论，

static方法不存在调用虚方法，在编译时就被设定为invokestatic，他的引用只和声明对象有关，与实例无关。