Java

Question 1

What is context switching in multi-threaded apps?

Answer 1

The time it takes to start processing another thread.

Question 2

What is the sort algorithm for Arrays.sort()

Answer 2

QuickSort - dual pivot

Question 3

What does SOLID stand for

Answer 3

1. Single-responsiblity Principal
2. Open-closed Principal
3. Liskov Substitution Principal
4. Interface Segregation Principal
5. Dependency Inversion Principal

Question 4

Which one is threadsafe StringBuilder or StringBuffer?

Answer 4

StringBuffer

Question 5

What are two ways to create a task that can run in parallel?

Answer 5

1. Extends Thread
2. Implements Runnable

Question 6

What is the Open-closed principal?

Answer 6

Open to change, closed to modification.

Question 7

What is the Liskov Substitution Principal?

Answer 7

Polymorphism just works.

Question 8

What is the Interface Segregation Principal?

Answer 8

Client should never be forced to implement an interface they do not use.

Question 9

What is the Dependency Inversion Principal

Answer 9

Entities must depend on abstractions.

Question 10

What is your perspective on the SOLID principals.

Answer 10

The Dependency Inversion Principal is pliable - tension with the YAGNI principal.

Question 12

In java what do you call to start a thread?

Answer 12

start()