Memory Management

Question 1

What 2 methods are used in ArrayList class?

Answer 1

add() and remove()

Question 2

A class defined to represent each list item is known as a…

Answer 2

list node

Question 3

True or false.
Can a node be inserted between 2 other nodes?

Answer 3

True

Question 4

What are the 4 memory regions that a program uses?

Answer 4

Code, Static Memory, The Stack, and The heap

Question 5

What is the region code?

Answer 5

The region where the program instructions are stored

Question 6

What is the region Static memory?

Answer 6

The region where static fields are allocated

Question 7

Does static variables change? Do their addresses change too?

Answer 7

Static variables do not change and their address do not change either.

Question 8

What is the Stack Region?

Answer 8

The region where a methods local variables are allocated during a method call.

Question 9

What can a stack region also be called?

Answer 9

It can also be called a automatic memor.

Question 10

What does a method call do?

Answer 10

It adds local variables to the stack and return removes them from the stack.

Question 11

What is the region The heap.

Answer 11

The region where the “new” operator allocates memory for objects.

Question 12

The heap can also be referred to as…

Answer 12

Free Store

Question 13

What is garbage collection?

Answer 13

Wherein a programs automatic behavior that finds certain areas unreachables i.e(unused)

Question 14

What is a reference count?

Answer 14

Java virtual machine keeps a count of all reference variables that are currently referring to an object

Question 15

What makes an object unreachable?

Answer 15

If there is no reference count than the object is unreachable.

Question 16

Execution stack means

Answer 16

the memory space used to store the information needed by a method, while the method is being executed

Question 17

What is a dynamic heap in Activation records?

Answer 17

When a new object is created

Question 18

What happens when a method returns?

Answer 18

On the execution stack: the activation method is popped off when the memory returns so the memory is deallocated

Question 19

What does an activation method contain?

Answer 19

1. Address to return to after the method ends
2. Methods parameters
3. Methods local variables
4. Return value (if any)

Question 20

What does a static heap contain?

Answer 20

Code and static objects