Variable Initializations

Object variables are initialized by their constructors or, in case they are not initialized by the constructor, have following default values:

numerical types corresponding value of 0

boolean false

reference types null

Formal parameter variables are initialized by the actual variables provided by the caller.

Local variables (those within blocks) must be initialized before they can be used. This rule is checked for by the compiler and the initializations have to be done in a way which are verifiable by the compiler.