What does this code do?

[abin joy]

code
-------------
public class Top {
{
System.out.println("hi");
}

}
----------------------
code

Why compiler is not showing any error in this code?Why dont this piece of code require a function to compile properly?

[Henry Wong]

The code is in an "instance initializer" which is executed during the construction process -- after the super() of the contructor has completed, but before the rest of the constructor has executed.

Henry

[abin joy]

I didnt get what you trying to say

[Henry Wong]

Here is the link to the relevant chapter in the Sun Java tutorial.

http://java.sun.com/docs/books/tutorial/java/javaOO/initial.html

Maybe you can start there...

Henry

[abin joy]

but why
code
--------------
class Alpha {
int over=1;
}
--------------
is allowed where as

code
--------------
class Alpha {
System.out.println("hi");
}
----------------

is not allowed

[ravikdcs dixit]

this code compiles fine
but not results in any output
since there is no public static void main() method
the statement in the main() method are only executed by the interpreter or JVM

[abin joy]

code
--------------
class Alpha {
System.out.println("hi");
}
----------------

this will not compile

[Campbell Ritchie]

Originally posted by abin joy:
but why
code
--------------
class Alpha {
int over=1;
}
--------------
is allowed where as

code
--------------
class Alpha {
System.out.println("hi");
}
----------------is not allowed

int over = 1; is a declaration and initialisation, not an ordinary statement.
System.out.println("hi"); is an ordinary statement. No ordinary statements allowed outside methods and initialisers.

[Henry Wong]

Also, did you read the tutorial page that I linked to? This follow-up question is explained too.

Henry