First Move (11~18) - Code, Learn, Build
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First Move (11~18) - Code, Learn, Build

Structured, level-based technology learning paths from foundational exploration to industry mastery.

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  • Python Programming (Active)
  • Computer Science Core
  • Web Development
  • AI & Machine Learning

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← Java Enterprise Development|Level 1: Java Syntax & Object-Oriented Principles

6. Arrays, String Memory Internals (String Pool & Immutability) & StringBuilder

Lesson 6 of 25
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Arrays, String Memory Internals (String Pool & Immutability) & StringBuilder

Master fixed arrays, multi-dimensional matrices, String immutability, String Constant Pool mechanics, and performance optimization with StringBuilder.

The Java String Constant Pool Architecture

### String Immutability & String Pool In Java, `String` objects are **immutable**. When you write `String s1 = "Java";`, the string literal is stored inside the **String Constant Pool** in JVM Metaspace/Heap. Multiple variables referencing identical string literals point to the exact same heap memory address!
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