It is very important to understand Java programming but for that Java Virtual Machine, runtime data areas are needed to understand as a prerequisite. OutOfMemoryError is one of the most dreaded errors in Java and is associated with Java Virtual Machine (JVM) memory areas.

1. Explain Java JVM Run Time
Data Areas

2. 1) Program Counter (PC) Register :
The program counter (PC) helps in recording the
current instruction execution at any moment. In a
sequence of instructions in a program, it is called as
a pointer to the current instruction. It is the same in
Java JVM terms. As Java assists multithreading,
the architecture is multithreaded and thus when a
thread is created a program counter is created. The
current statement executed in the thread is
executed by the PC counter.
Ream More : Multithreading in Java
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3. 2. Heap Memory :
For storing objects of arrays and classes, heap data
area is used. Across multiple threads, heap memory
is common and shared. Garbage collector comes
to the rescue over here. At VM startup heap data
area is created. This helps in claiming the memory
back by the garbage collector. It is regarded as the
best feature of Java.
Read More : Garbage Collectors In Java and It’s
Types
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4. 3. Method Area :
There is a logical part of heap area called method
area but JVM implementers decide about it. There
are per class structures and fields in the method
class. It consists of method data, method and
constructor code, run-time constant pool. At JVM
startup, a method is created and shared among
other threads. If the memory space is not enough
during the run-time then JVM will throw
OutofMemoryError.
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5. 4. Run-time Constant Pool :
Outside of the method area, a run-time constant
pool is created and it is done by JVM when an
interface or class is created. The constant pool
table has the Run-time constant pool which is the
best suited for a single class or interface. If the JVM
cannot find the memory for run-time constant pool
allocation it will throw OutOfMemoryError.
Read More : Understanding JVM Internal

6. THANK YOU