Answer Posted / vinoth sing

abstract class contain both abstract and non abstract methods
vs
interface can have only abstract methods.

a class implementing a interface itself a abstract class.

eg for interface

interface shape2d
{
double getArea();
}

class circle implements shape2d
{
int radius;
public double getArea()
{
return math.pi*r*r;

}
circle(int radius)
{
this.radius=radius;
}
class circledemo
{

public static void main (string args[])
{
circle c= new circle(10);
system.out.println(c.getArea());
}

}

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