Java defining or initializing attributes of a class

Question

Is there a difference between defining class attributes and initializing them? Are there cases where you want to do one over the other?

Exampl

Answer 1

In Java, initializing is defined explicitly in the language specification. For fields and array components, when items are created, they are automatically set to the following default values by the system:

numbers: 0 or 0.0

booleans: false

object references: null

This means that explicitly setting fields to 0, false, or null (as the case may be) is unnecessary and redundant.