Why can't variables be declared in an if statement?

Question

The following Java code does not compile.

int a = 0;

if(a == 1) {
    int b = 0;
}

if(a == 1) {
    b = 1;
}

Why? There can be no code pa

Answer 1

{ } is used to define scope of variables.And here you declared :

if(a == 1) 
{
    int b = 0;
}

So here scope of b will be only in { }.So you are using variable b outside { }, it is giving compilation error.

You can also refer this:

http://docs.oracle.com/javase/tutorial/java/javaOO/variables.html