Java 语法 索引 ----- 抽象类(Abstract)

abstract class Shape

{

    public int x = 100, y = 100;

    public abstract int getArea();

}





class Rectangle extends Shape

{

    @Override 

    public int getArea()

    {

        return x * y;

    }

}

参考文献： Java Quick Syntax Reference by Mikael Olsson