Abstract class??

[Joe San]

The below one is from here

abstract class TestClass 
{
   transient int j;
   synchronized int k;
 
   final void TestClass(){}
   static void f() 
   {
      k = j++;
   } 
}

Select 2 correct options

1. The class TestClass cannot be declared abstract
2. The variable j cannot be declared transient
3. The variable k cannot be declared synchronized
4. The constructor TestClass( ) cannot be declared final
5. The method f( ) cannot be declared static


Answer given as 3 and 5, 3 is ok but how come 5??

[Manju Devarla]

Becuase Interface methods and abstract class methods cant be static

[Ahmed Khan Mohammed]

Thats because the variable j is non static and cannot be accessed from a static context.

Followup to the comment :
An abstract class can contain static methods.

[ashni Prakash]

In the above code given by jothi how come the constructor has return type.As per my knowledge constructors doesnt have any return type not even void.Can anyone clear my doubt please?

[Barry Gaunt]

It is not a constructor: it is a method that happens to have the same name as the class.

[ashni Prakash]

But in the 4th option they have said its a constructor.The below link has given differences between constructors and methods which says methods cant have same name as class.

http://www.javaworld.com/javaworld/jw-10-2000/jw-1013-constructors.html

[Barry Gaunt]

Try this:

public class AClass {
void AClass() {
System.out.println("oh oh");
}
public static void main(String[] args) {
new AClass().AClass();
}
 
}

[Garrett Rowe]

The below link has given differences between constructors and methods which says methods cant have same name as class.

Actuallly the article doesn't say that at all.

Constructors have the same name as their class; by convention, methods use names other than the class name.

Emphasis mine.

[ashni Prakash]

hi ranchers,


I executed the code successfully.As per my understanding by java convention it is not advisable to use classname as method name but it wont throw errors if we use it.
[ December 19, 2006: Message edited by: nike sama ]

[Joe San]

Thanks ranchers. I didn't notice the use of non-static variable from a static context when I was answering this question. Thanks all for the participation.

[Ramya Chowdary]

not worth to be asked for real scjp
[ December 19, 2006: Message edited by: ramya sri ]

[Ramya Chowdary]

not worth to be asked for real scjp,options are not clear

[pengfei cao]

Try this
code:

abstract class TestClass
{
transient static int j;
synchronized static int k;
final void TestClass(){}
static void f()
{
k = j++;
}
}


The result is

modifier synchronized not allowed here
synchronized static int k;
^
1 error

That is all!