And here JLS 8.2.3.2:Restrictions on the use of Fields during Initialization
Quote:
The declaration of a member needs to appear before it is used only if the member is an instance (respectively static) field of a class or interface C and all of the following conditions hold:
1. The usage occurs in an instance (respectively static) variable initializer of C or in an instance (respectively static) initializer of C.
2. The usage is not on the left hand side of an assignment.
3. C is the innermost class or interface enclosing the usage.
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