Web Reference: Apr 27, 2023 · Just as static initializer blocks can be used to initialize static fields in a named class, Java provides the ability to initialize fields during object creation using instance initializer blocks, and that is the subject of this article. Jan 23, 2026 · In Java, an Instance Initialization Block (IIB) is used to initialize instance-level data and executes every time an object is created, before the constructor. It helps run common initialization logic shared across multiple constructors and ensures consistent object setup. Mar 4, 2026 · In this tutorial, we’ll learn the concept of static block and instance initializer block. We’ll also check the differences and the execution order of the class constructors and initializer blocks.
YouTube Excerpt: Understanding when to use IIB.
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