CODEWITHSUNDEEP
java
Mercenary
Mercenary

Reputation: 2166

Scope of variable declared inside a for loop

for(int i=0; i<10;i++){
 int j=0;
}

Is j a block variable or a local variable? I see that j's scope is only till the for loop ends

Upvotes: 6

Views: 11736

Answers (5)

Suresh Atta
Suresh Atta

Reputation: 121998

Local variables are declared in methods, constructors, or blocks.

From that it's clear that, All block variables are local variable's.

As per definition of Block

A block is a group of zero or more statements between balanced braces and can be used anywhere a single statement is allowed.

So 

{   //block started

}    //block ended

What ever the variables declared inside the block ,the scope restricted to that block.

for(int i=0; i<10;i++){
 int j=0;
}

So J scope is restricted to inside that block. That is for loop.

for(int i=0; i<10;i++){
 int j=0;
 //do some thing with j ---> compiler says "yes boss"
}
//do some thing with j ---> compiler says "Sorry boss, what is j ??"

Upvotes: 10

aga
aga

Reputation: 29416

The word "local" means that something is available somewhere, but not outside the bounds of this "somewhere". In Java variables declared inside a block have a block scope, which means that they're available only inside this block - they're local to it.

Upvotes: 1

Karolis Tarasaitis
Karolis Tarasaitis

Reputation: 43

j variable is accessible inside {this block} only. That not only means that it can't be changed anywhere else, but also it is recreated every time loop loops.

Upvotes: 1

codingenious
codingenious

Reputation: 8653

j has scope in the loop only, outside the loop, j can not be accessed. For more on scopes, refer the link, it will be helpful.

Upvotes: 0

dckuehn
dckuehn

Reputation: 2475

It is a local variable to that for block. Outside of that for loop, j will cease to exist.

Upvotes: 2

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