0 views collected around this technical thread.
The article explains how the JVM reduces memory consumption on 64‑bit systems by using compressed ordinary object pointers (compressed oops), describes pointer size, alignment and padding, shows C struct and JVM object layout examples, and demonstrates inspection tools like HSDB and XPocket for analyzing object memory footprints.
This article explains how the Java Virtual Machine achieves write‑once‑run‑anywhere by abstracting platform differences, then details the JVM’s internal components—including the class‑loader subsystem, runtime data areas such as heap, stack, method area, and program counter—followed by code examples and analysis of object layout, pointer compression, and memory allocation strategies.
This article explains how Java objects are stored in memory, covering the object header, instance data, alignment padding, lock states, pointer compression, and field reordering, and demonstrates how to inspect these structures using the OpenJDK JOL tool with practical code examples.