can we declare static variables inside static block in java

Question

Why can't we declare static variables inside a static block because static attributes ,when are allotted memory during class loading time and also ,with the class loading only the static block gets executed then why is there a restriction that we can't do this.

Also,during class loading when the main method gets loaded then why cant we even declare our static variables inside the main method also.

Java needs to know what variables a class has at compile-time, not run-time. — August
– August, Commented Nov 17, 2014 at 23:35

Germann Arlington · Accepted Answer · 2014-11-17 23:49:13Z

3

Any variable declared within ANY block will be block-local - they can not be static for that simple reason.

answered Nov 17, 2014 at 23:49

Germann Arlington

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Comments

Ringo · Accepted Answer · 2014-11-17 23:43:52Z

1

You can declare a variable static inside a static block because static variables and methods are class instead of instance variable and methods.

This means that you wont be able to see a static field inside a method because it will be inside an inner scope and won't be a class variable at all...

For example:

static int a;
static int b;
public static int sum(){
    return a+b;
}

This is completely legal because when calling this method, then it will perform operations with variables that have already been loaded. if you do it the other way around, who will this variable belong to?

Another reason is that all variables declared inside a static block will be static too by default.

edited Nov 17, 2014 at 23:43

answered Nov 17, 2014 at 23:36

Ringo

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3 Comments

Germann Arlington Over a year ago

Correction - any variable declared within a block will be block-local

radhika Over a year ago

yes sir ,I understood but why is the following code giving error public class qu3 { static { static int a=90; } }

Ringo Over a year ago

Because you cant have a CLASS variable inside a local scope

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