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A: There is no direct management of the storage size of code that is held in memory by the Java Virtual Machine (JVM). The virtual machine manages the allocation and de-allocation of storage through an integral garbage collection system. The JVM keeps track of all object references and periodically disposes of de-referenced objects to free memory.
It is possible to check the overall memory use of a Java application with methods in the java.lang.Runtime class. The freeMemory() method returns the spare memory available to the runtime system, the totalMemory() method reports the total memory allocated to the virtual machine, so you can deduce the memory in use, as below.
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How do I find the size of an object in Java?