The heap is created on virtual machine start-up. The heap is the runtime data area from which memory for all class instances and arrays is allocated. The Java virtual machine has a heap that is shared among all Java virtual machine threads. Here’s the definition of a Java heap, again with a few pieces removed for clarity: In layman’s terms, a simplification is to say that local variables and methods are on the Java stack. Because the Java virtual machine stack is never manipulated directly except to push and pop frames, frames may be heap allocated. A Java virtual machine stack stores frames.Ī Java virtual machine stack is analogous to the stack of a conventional language such as C: it holds local variables and partial results, and plays a part in method invocation and return. Here’s the definition of a Java stack, with a few pieces removed for clarity:Įach Java virtual machine thread has a private Java virtual machine stack, created at the same time as the thread. There’s no better source than the source, so directly from Sun’s Java website, here are definitions for the Java stack and Java heap. I just read a couple of emails about the concepts of a Java stack and heap, and thinking that their descriptions weren’t exactly right, I decided to do a little research.
Summary: This article provides definitions and descriptions of the Java stack and heap.
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