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具體問題：是extends不是extands

類Circle拼錯

Circle構(gòu)造方法height拼錯abstract?class?Shape

{

public?int?width,height;

public?Shape(int?width,int?height)

{

this.width=width;

this.height=height;

}

abstract?double?getArea();

}

class?Rectangle?extends?Shape

{

public?double?getArea()

{

return?width*height;

}

public?Rectangle(int?width,int?height)

{

super(width,height);

}

}

class?Circle?extends?Shape

{

double?r;

public?double?getArea()

{

return?r*r*Math.PI;

}

public?Circle(int?width,int?height)

{

super(width,height);

r=(double)width/2.0;

}

}

public?class?JavaApplication4

{

public?static?void?main(String[]?args)

{

Rectangle?re=new?Rectangle(25,25);

Circle?ci=new?Circle(8,4);

System.out.println(re.getArea()+ci.getArea());

}

}

總結(jié)

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