1Digital Stack Interview Questions and Answers

Multithreading allows for concurrent execution of multiple threads, improving performance and responsiveness.

• Multithreading can improve CPU utilization by allowing multiple threads to execute simultaneously.

• It can also improve application responsiveness by allowing tasks to be executed in the background while the main thread continues to run.

• Multithreading can be used for parallel processing, such as in scientific simulations or video encoding.

• It can also be used for asynchro...read more

wait() method in Java is used to make a thread wait until another thread completes its execution.

• wait() method is used in multi-threading programming.

• It is used to synchronize threads and avoid race conditions.

• It is used with notify() and notifyAll() methods.

• wait() method releases the lock on the object it is called on.

• It can be used with a timeout parameter to avoid indefinite waiting.

Process is an instance of a program while thread is a subset of a process.

• Process is a program in execution while thread is a subset of a process that can execute independently.

• Processes have their own memory space while threads share the same memory space.

• Processes are heavyweight while threads are lightweight.

• Examples of processes are web browsers, word processors, etc. while examples of threads are spell checkers, print spoolers, etc.

Arrays are a collection of similar data types. While and do-while are loops used for repetitive execution of code.

• Arrays can be one-dimensional or multi-dimensional

• While loop executes code as long as the condition is true

• Do-while loop executes code at least once before checking the condition

• Example: int[] arr = {1, 2, 3}; while(i < arr.length) {System.out.println(arr[i]); i++;}

• Example: int i = 0; do {System.out.println(i); i++;} while(i < 5);

Multithreading is the ability of a CPU to execute multiple threads concurrently.

• Multithreading improves performance by utilizing idle CPU time.

• Threads share the same memory space, allowing for efficient communication.

• Examples include web servers handling multiple requests and video games rendering graphics while processing user input.

Overriding is a feature in object-oriented programming where a subclass provides its own implementation of a method that is already defined in its superclass.

• Overriding allows a subclass to provide a specific implementation of a method that is already defined in its superclass.

• The method signature (name, parameters, and return type) must be the same in both the superclass and subclass.

• The subclass method must have the same or a more accessible access modifier than the supercl...read more