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Core Java - Interview Questions and Answers for 'Heap memory' - 9 question(s) found - Order By Rating

 Q1. Can we do a thread specific heap allocation ?Memory Management
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   Like         Discuss         Correct / Improve     memory management  heap memory   heap allocation      expert

 Q2. Do threads have a distinct heap ?Memory Management
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 Q3. How many heaps will be there with 3 threads ?Core Java
Ans. All threads share a common heap.

Each thread has a private stack, which it can quickly add and remove items from. This makes stack based memory fast, but if you use too much stack memory, as occurs in infinite recursion, you will get a stack overflow.

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   Like         Discuss         Correct / Improve     memory management  heap memory     Asked in 1 Companies

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  Q4. What is a String Pool ?Core Java
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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   Like         Discuss         Correct / Improve     java   oops   string   string class   string pool   heap memory     Asked in 31 Companies      intermediate        frequent
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  Q5. Which are the different segments of memory ?Core Java
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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   Like         Discuss         Correct / Improve     java   memory   memory management   stack memory   heap memory   code segment memory   advanced     Asked in 9 Companies      expert        frequent
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 Q6. Which kind of memory is used for storing object member variables and function local variables ?
Ans. Local variables are stored in stack whereas object variables are stored in heap.

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   Like         Discuss         Correct / Improve     java   jvm   memory management   stack memory   heap memory      expert

 Q7. Why do member variables have default values whereas local variables don't have any default value ?
Core Java
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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   Like         Discuss         Correct / Improve     java   jvm   memory management   variables   stack memory   heap memory   default values      expert

 Q8. Difference between Stack and Heap memory ?Core Java
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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 Q9. What is OutOfMemoryError in Java?Core Java
Ans. OutOfMemoryError in Java is a subclass of VirtualMachineError and is thrown by JVM when it runs out of heap memory.

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

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