The posts How much memory the java objects consume? and Estimating the memory usage of a java object are also related.

Local variables that refer to objects contain pointers from the stack frame of the Java method into the Java heap. Object fields of reference type point from one Java heap location to another.

This article presents a Java implementation of this pattern that eases the addition of plain-old-Java-object (POJO) behavior objects to class instances.

Developers who create a runnable Java class, be it for a ‘Hello World’ demonstration or to kick off a fully featured enterprise application, will enjoy the following technical benefits when using ...