Restriction on parent class

[faisal hameed]

//can we apply restriction on parent class that he cannot creat object of shape type

 

class Shape
{

}
class Circle extends Shape
{}
class Square extends Shape
{}
class Rectangle extends Shape
{}

public class TestShape
{
	public static void main(String args[])
	{
		Shape shape = new Shape();  //Can we restrict it.
		Shape circle = new Circle();
		Shape square = new Circle();
		Shape rectangle = new Circle();
	}
}   

[Rakesh Enoch]

Make Shape an Interface. Let other classes implement it. This way you cannot intantiate Shape Class.

[Rob Spoor]

And if you can't make it an interface, make it abstract. An abstract class does not need to have any abstract methods, so all you need to do is add the abstract modifier to the class.