Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This Java tutorial teaches you how to declare classes, describe attributes via fields ...

Java 25 introduces Compact Object Headers (JEP 519), delivering up to 30% CPU savings and reduced memory usage for applications with small objects. This user-friendly feature compresses object headers ...

Object-oriented systems are usually partitioned into layers of related responsibilities and only dependencies in one direction are allowed, from higher layers (more specific, less reusable) to lower ...

All this is simplified in Java. You treat everything as an object, so there is a single consistent syntax that you use everywhere. Although you treat everything as an object, the identifier you ...

This approach, called "object monitor tables", was implemented in JDK 22 and is activated by a new switch UseObjectMonitorTable that is on by default. Compact object headers rely upon this mechanism.