The heap is the area in memory in which objects are created.
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// Get current size of heap in bytes
??? long heapSize = Runtime.getRuntime().totalMemory();
???
??? // Get maximum size of heap in bytes. The heap cannot grow beyond this size.
??? // Any attempt will result in an OutOfMemoryException.
??? long heapMaxSize = Runtime.getRuntime().maxMemory();
???
??? // Get amount of free memory within the heap in bytes. This size will increase
??? // after garbage collection and decrease as new objects are created.
??? long heapFreeSize = Runtime.getRuntime().freeMemory();
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