Understanding Java Object Memory Layout and the Size of new Object()

This article explains how Java objects are stored in memory, analyzes the heap layout, object header, instance data, and padding, demonstrates the byte size of a new Object() with and without compressed OOPs, and discusses object access methods and garbage‑collection regions.

Object Sizecompressed-oopsgarbage-collection

0 likes · 12 min read

Understanding Java Object Memory Layout and the Size of new Object()

Programmer DD

Dec 16, 2020 · Fundamentals

How Much Memory Does a Java Object Really Use? A Deep Dive

Understanding the actual memory footprint of Java objects—including headers, class pointers, fields, alignment, and array overhead—reveals hidden waste, and the article offers practical rules and code examples to reduce memory usage by preferring primitive types, smaller fields, arrays over collections, and other tricks.

JavaMemoryObject Size

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How Much Memory Does a Java Object Really Use? A Deep Dive

Qunar Tech Salon

Apr 9, 2019 · Fundamentals

Understanding Java Object Memory Layout and the Oop‑Klass Model

This article explains the JVM Oop‑Klass model, details how Java objects are represented in heap memory, shows how to calculate their size using source code analysis, HSDB, Instrumentation, Unsafe, and third‑party tools, and provides practical examples and code snippets.

HSDBJVMJava

0 likes · 15 min read

Understanding Java Object Memory Layout and the Oop‑Klass Model