Regarding Abstract Class

[Mohana Priya]

An Absract class with concrete static methods alone need not be sub-classed in its life time .Am I right ?

[Burkhard Hassel]

Did you mean cannot be subclassed?
If so the answer is no, can be subclassed.

But this class needs not to be abstract, methods being static or not.
Yours,
Bu.

[Jeronimo Sanchez]

What I think Mohana is trying to ask is if all methods in an abstract class are static, do we need to sub-class the class? And the answer is no, we do not need to do so to call the static methods.

It's perfectly legal to invoke static methods within abstract classes. Check the foloowing example:

abstract class A {
    static void go () {
        System.out.println("Static method in abstract class");
    }
}
 
public class TestDrive01 {
    static public void main (String[] args) {
        A.go();
    }
}

Other question is why to have an abstract class with only static methods.

[Dave Reinhardt]

There are a few abstract classes with static methods in the API that are part of the SCJP exam. See page 471 in SCJP

java.util.Calendar
java.text.DateFormat
java.text.NumberFormat

Can anyone name others that we need to know for the exam?