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Q41. Why do we need Garbage collection ?

Ans. Garbage collection mechanism frees up the memory that is no longer needed. In languages like C / C++ the deallocation needs to be done explicitly by the programmer and hence any leniency may result in memory leak. Garbage collection in java ensures that all unused memory is reclaimed and hence there are no memory leaks.Moreover it relieves the programmer from the hassle of carefully releasing all memory.

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Q42. What is JVM ?

Ans. JVM (Java Virtual Machine) is an abstract machine. It is a specification that provides runtime environment in which java bytecode can be executed.JVMs are available for many hardware and software platforms (i.e. JVM is platform dependent).Runtime Instance Whenever you write java command on the command prompt to run the java class, an instance of JVM is createdThe JVM performs following operation:Loads codeVerifies codeExecutes codeProvides runtime environment

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Q43. How is garbage collection in Java 8 different from Java 7 ?

^{This question is still unanswered. Can you please provide an answer.}

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Q44. What is the purpose of String Pool ? Don't you think it's a performance overhead to have unnecessary check for string in string pool ?

Ans. String Pool makes Java more memory efficient by providing a reusable place for string literals. It might be a little performance inconvenience but results in good amount memory saving.

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_{Like Discuss Correct / Improve string pool memory management Intermediate}

Q45. In which memory segment - heap or stack, the following stored by JVM

1. static members
2. objects
3. object references
4. local or method variables

Ans. static members are stored in method area of heap

objects are stored on heap

object references are stored on stack

local or method variables are stored on stack

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Q46. What are different methods to get the permanent gen space of running application?

^{This question was recently asked at 'Apcolite'.This question is still unanswered. Can you please provide an answer.}

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Q47. Which memory segment is cleaned by Garbage Collection - stack or heap ?

Ans. Heap as objects are stored ink heap.

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_{Like Discuss Correct / Improve memory management stack heap garbage collection}

Q48. Which memory segment holds the byte code ?

Ans. Code Segment

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_{Like Discuss Correct / Improve Memory Management Code Memory Segment Code Segment Memory Code Segment}

Q49. How many heaps will be there with 3 threads ?

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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Q50. Explain memory leaks and how to prevent them.

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Q51. Should we do anything to avoid memory leaks in Java ?

Ans. Java has a intrinsic way of checking leaks and reclaiming memory called garbage collection. Moreover Java doesn't support pointer arithmetics , so there is very low comparative chance of memory leaks, compared to C,C++

Though there may be tools that may audit code to make sure that we are not leaving much for the garbage collection to work but I have never heard anyone doing anything for memory leaks in Java.

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Q52. Do threads have a distinct heap ?

Memory Management

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Q53. Can we do a thread specific heap allocation ?

Memory Management

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Q54. Function variables are kept in ..

a. Stack

b. Heap

c. Both Stack and Heap

d. None of them

Ans.a. Stack

Q55. Which memory segment holds String Pool ?

a. Stack

b. Heap

c. Code Segment

d. Class Segment

Ans.b. Heap

Q56. In this code

public class BuggyBread1{
   private static String staticVariable = "static Variable";

   private String instanceVariable = "instance Variable";

   public static void main (String args[]) {
String localVariable = "local Variable";
}
}

Where will the value 'static Variable' be stored ?

a. Stack Memory Segment

b. Heap Memory Segment

c. Runtime Constant Pool within Heap Segment

d. Code Segment

Ans.c. Runtime Constant Pool within Heap Segment

Q57. In this code

public class BuggyBread1{
   private static String staticVariable = "static Variable";

   private String instanceVariable = "instance Variable";

   public static void main (String args[]) {
String localVariable = "local Variable";
}
}

Where will the value 'static Variable' be stored ?

a. Stack Memory Segment

b. Heap Memory Segment

c. Runtime Constant Pool within Heap Segment

d. Code Segment

Ans.c. Runtime Constant Pool within Heap Segment

Q58. In this code

public class BuggyBread1{
   private static String staticVariable = "static Variable";

   private String instanceVariable = "instance Variable";

   public static void main (String args[]) {
String localVariable = new String("local Variable");
}
}

Where will the value 'local Variable' be stored ?

a. Stack Memory Segment

b. Heap Memory Segment

c. Runtime Constant Pool within Heap Segment

d. Code Segment

Ans.a. Stack Memory Segment

Q59. In this code

public class BuggyBread1{
   private static String staticVariable = new String("static Variable");

   private String instanceVariable = "instance Variable";

   public static void main (String args[]) {
String localVariable = "local Variable";
}
}

Where will the value 'static Variable' be stored ?

a. Stack Memory Segment

b. Heap Memory Segment

c. Runtime Constant Pool within Heap Segment

d. Code Segment

Ans.b. Heap Memory Segment

Q60. Which of following memory segment is cleaned by Garbage Collection Mechanism ?

a. Stack

b. Heap

c. Code

d. Cache

Ans.b. Heap

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