BlackRock–styleSoftware EngineerSoftware EngineerQuestion #35
What is the difference between an interface and an abstract class in Java? How does method overloading differ from method overriding? Can you explain the concept of encapsulation? What is the purpose of the 'final' keyword in Java?
Build Your Approach
State the assumptions, try a simple case, then work toward a general solution. Check the result and explain how it changes if an assumption changes.
Try the free diagnostic with worked solutions →Get Free Interview Prep Resources
More BlackRock–Style Software Engineer Questions
Write an algorithm that sorts a hashmap.Given a string, determine if it is a palindrome, ignoring any characters that are not alphabetic.1) Reverse a number: Given an integer input, output its digits in reverse order. For example, input: 9966, output: 6699.
2) Word count in a string: Given a string, return the count of each unique word. For example, input: 'The lovely lady is looking lovely as all lady look lovely' output: The: 1, lovely: 3, lady: 2, is: 1, looking: 1, as: 1, all: 1, look: 1.
3) Swap two numbers without using a temporary variable: Given two numbers, swap their values without using a third variable. For example, input: a = 10, b = 20. Output: a = 20, b = 10.Solve the intersection of two linked lists from scratch, including implementing the linked list data structure. Start with a brute-force approach and optimize it. Also, explain the difference between arrays and linked lists.Given a singly linked list, find and return the value of the middle node.
Practice the Reasoning Behind the Answer
Bring your target roles and interview timeline to a free quant consult. Discuss your preparation priorities and how Quant Blueprint’s lessons, practice and mock interviews can help.
Book a Free Quant ConsultYour goals · your preparation · your next steps