Class Methods Inheritance

Question

I was told that static methods in java didn't have Inheritance but when I try the following test

package test1; public class Main { /** * @param args the command line arguments */ public static void main(String[] args) { TB.ttt(); TB.ttt2(); } }

package test1; public class TA { static public Boolean ttt() { System.out.println("TestInheritenceA"); return true; } static public String test ="ClassA"; }

package test1; public class TB extends TA{ static public void ttt2(){ System.out.println(test); } }

it printed :

TestInheritenceA ClassA

so do java static methods (and fields) have inheritance (if you try to call a class method does it go along the inheritance chain looking for class methods). Was this ever not the case? And are there any inheritance OO languages that are messed up like that for class methods?

So apparently static methods are inherited but can't be overidden, so does c# share that problem? Do any other Languages?

Oak · Accepted Answer · 2010-06-15 11:55:12Z

5

In Java, fields and static methods are inherited, but cannot be overridden - I believe that is what whoever told you that "they are not inherited" meant.

Non-private, non-static methods are inherited and can be overridden.

answered Jun 15, 2010 at 11:55

Oak

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2 Comments

Shimi Bandiel Over a year ago

Add also "non-final" to the answer :)

Roman A. Taycher Over a year ago

I totally forgot this question and made the same mistake discussing java on irc a few days ago.

ZeissS · Accepted Answer · 2010-06-15 11:55:07Z

This was always the case, but you cannot override class methods:

class A { public static void a() { system.out.println("A"); } } class B { public static void a() { system.out.println("B"); } } A a = new A(); a.a(); // "A" B b = new B(); b.a() // "B" a = b; a.a(); // "A"

If B would not extend A, the assignment would not work and the whole question would be meaningless ... :D

Sid · Accepted Answer · 2010-06-15 12:09:31Z

0

That's the meaning of static. It means per class. Static fields and methods are shared among instances. If you change a static value, it's reflected across instances.

answered Jun 15, 2010 at 12:09

Sid

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2 Comments

Singleton Over a year ago

Methods always shared between instances, no matter weather they are marked as static or not. kindly change the statement.

Sid Over a year ago

I have mentioned static value. Methods are behavior.

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