How Does Java Handle Class and Object Initialization?

Java Order of Initialization and Instantiation

Initialization and Instantiation Overview

Initialization involves assigning values to static and final fields during class loading, while instantiation pertains to initializing object instances during object creation.

Class Initialization

• Interfaces are initialized separately when first accessed, potentially through recursive initialization.
• Static fields and initializers are processed chronologically during class initialization.

Object Initialization

• Instance variables and initializers are assigned values in textual sequence during object creation.
• Constructors are invoked recursively, with the superclass constructor executed before the current class's constructor.

Interface Handling

• Interfaces are initialized independently of the classes they extend and are not processed before superclasses during class initialization.

Role of super() Constructor

• The nondefault super() constructor determines which superclass constructor to invoke.
• It affects the order of constructor execution but not the overall initialization process.

Misconceptions and Missing Details

• Compile-time constants are not initialized during class or object initialization.
• Non-constant fields are initialized before compile-time constants.

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