Why use static blocks over initializing instance variables directly?

Question

Why would I use a static block:

static {
   B = 10;
}

over:

Integer B = 10;

What is the advantages/disadv

Answer 1

The static block allows you to write more complex initialization logic for the attribute, whereas the one-line initialization limits you to a single expression.

Be aware that initialization blocks exist for both instance and static attributes, for example this one initializes an instance attribute at instantiation time:

private int a;
{ a = 10; }

Whereas this one initializes a static attribute at class loading time:

private static int b;
static { b = 10; }

The initialization procedure is explained in detail in here, as part of the JVM specification.