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Interview Questions and Answers for 'Heap memory' - 6 question(s) found - Order By Newest

 Q1. Which are the different segments of memory ?Core Java
Anonymous
Ans. 1. Stack Segment - Contains primitives, Class / Interface names and references.

2. Heap Segment - Contains all created objects in runtime, objects only plus their object attributes (instance variables), Static variables are also stored in heap.

3. Code Segment - The segment where the actual compiled Java bytecodes resides when loaded

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  Q2. What is a String Pool ?Core Java
Anonymous
Ans. String pool (String intern pool) is a special storage area in Java heap. When a string is created and if the string already exists in the pool, the reference of the existing string will be returned, instead of creating a new object and returning its reference.

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 Q3. Why do member variables have default values whereas local variables don't have any default value ?
Core Java
Anonymous
Ans. member variable are loaded into heap, so they are initialized with default values when an instance of a class is created. In case of local variables, they are stored in stack until they are being used.

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 Q4. Which kind of memory is used for storing object member variables and function local variables ?
Anonymous
Ans. Local variables are stored in stack whereas object variables are stored in heap.

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 Q5. Difference between Stack and Heap memory ?Core Java
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Ans. Stack memory areas is used to hold method and local variables while objects are always allocated memory in the heap. The heap memory is shared between multiple threads whereas Stack memory isn't.

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 Q6. What is OutOfMemoryError in Java?
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Ans. OutOfMemoryError in Java is a subclass of VirtualMachineError and it’s thrown by JVM when it ran out of heap memory.

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   Like      Discuss      Correct / Improve     outofmemoryerror   error   exceptions   jvm   java   heap memory   heap




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