Volkswagen Group Technology Solution Interview Questions and Answers

Find duplicate elements in an array of strings

• Iterate through the array and use a HashMap to store elements and their frequencies

• Identify elements with frequency greater than 1 as duplicates

• Return the list of duplicate elements

Remove duplicate words from a string

• Split the string into an array of words

• Create a new array to store unique words

• Iterate through the original array and add words to the new array if they are not already present

• Join the unique words array back into a string

Longest common subsequence is the longest sequence of characters that appear in the same order in both strings.

• Use dynamic programming to solve this problem efficiently.

• Create a 2D array to store the lengths of longest common subsequences.

• Iterate through the strings and fill the array based on the characters' matches.

• Trace back the array to find the actual longest common subsequence.

Inheritance in Java allows a class to inherit properties and behavior from another class.

• Inheritance enables code reusability and promotes the concept of hierarchical classification.

• Subclasses inherit attributes and methods from their superclass.

• Example: class Animal { } class Dog extends Animal { }

• Superclass is also known as base class, and subclass is also known as derived class.

OOPs in Java stands for Object-Oriented Programming concepts which include inheritance, encapsulation, polymorphism, and abstraction.

• OOPs in Java is a programming paradigm that uses objects to design applications.

• It includes four main concepts: inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation refers to the bundling of data and methods that operate on the data into a single ...read more