Memory Allocation + java-visual

Which of the following memory areas is used to store objects that are created dynamically?

• Stack memory
• Heap memory
• String pool
• Main memory

Answer explanation

The heap memory is used to store objects that are created dynamically. This means that the objects are not created at compile time, but rather when the program is running. The heap memory is a more flexible memory area than the stack memory, as it can be used to store objects of any size.

Which of the following memory areas is used to store local variables and method parameters?

• Stack Area
• Heap Area
• Method Area
• Native Method Stack

Answer explanation

The stack area is used to store local variables and method parameters. It is a separate memory area for each thread, and it grows and shrinks as the thread executes. The heap area is used to store objects, and the method area is used to store class information. The native method stack is used to store the native method frames for native methods.

Where is the string "Tom" stored in memory?

• (A) Stack
• (B) Heap
• (C) String pool
• (D) Permanent generation

Answer explanation

The string "Tom" is a string literal, which means that it is a constant string value. String literals are stored in the string pool, which is a special area in the heap. The string pool is shared by all objects in the program, so multiple objects can refer to the same string literal without creating duplicate copies of the string.

Which of the following is the largest memory area in a Java virtual machine (JVM)?

• Stack
• Heap
• Permanent Generation
• Code Segment

Answer explanation

The heap is the largest memory area in a JVM. It is used to store objects that are created by the program. The stack is used to store local variables and method parameters. The permanent generation is used to store classes and class metadata. The code segment is used to store the compiled bytecode of the program.

Which of the following memory areas is used to store native methods?

• Class (Method) Area
• Heap
• Stack
• Native Method Libraries

Answer explanation

The answer is Native Method Libraries because this is where the native code is stored. Native code is code that is written in a language other than Java, such as C or C++. The Java Virtual Machine (JVM) uses native method libraries to interact with native code

Which of the following memory areas is used to store the order of method execution and local variables?

• The stack
• The heap
• The global variables
• The static variables

Answer explanation

he answer is the stack, as shown in the image. The stack is used to store the order of method execution, as well as local variables that are created within a method. The heap is used to store objects that are created dynamically, such as arrays and objects that are returned from functions. Global variables and static variables are stored in the global memory area.

Which of the following statements correctly describes the difference between stack memory and heap memory?

• Stack memory is used to store local variables, while heap memory is used to store global variables.
• Stack memory is used to store data that is allocated at compile time, while heap memory is used to store data that is allocated at runtime.
• Stack memory is used to store the order of method execution, while heap memory is used to store the objects that are created by the program.
• Stack memory is used to store data that is stored in a LIFO (last in, first out) order, while heap memory is used to store data that is stored in a FIFO (first in, first out) order.

Answer explanation

The image shows the stack memory storing the local variables emp_name and id of the Emp object, as well as the invoke function. The heap memory stores the Emp object itself, as well as the string pool "Maddy" and the reference "21emp.name".

Where is the value 100 stored?

• Stack
• Heap
• Both stack and heap
• Neither stack nor heap

Answer explanation

The value 100 is assigned to the variable b.The variable b is a primitive type, which means it is stored on the stack.However, when the value of b is changed to 100, the old value of b is not overwritten. Instead, it is copied to the heap.This is because the heap is used to store objects, which can be complex and contain multiple values.The value 100 is therefore stored in the heap, even though the variable b is stored on the stack.

What is the purpose of the code in the image?

• To create a list of strings.
• To print a list of strings.
• To add strings to a list.
• To delete strings from a list.

Answer explanation

The answer is (A), "To create a list of strings." This is the most likely purpose of the code, as the first line of code creates a new ArrayList of Strings. The other answer choices are less likely, as they do not involve creating a list of strings.

What is the purpose of the cloud in the image?

• To store data
• To provide computing resources
• To deliver applications
• To manage user accounts

Answer explanation

The cloud in the image is a representation of a cloud computing platform. Cloud computing platforms provide computing resources, such as servers, storage, and networking, to users on demand. This allows users to scale their applications up or down as needed, without having to worry about managing the underlying infrastructure.