KoreTeq Interview Questions and Answers

1) Print duplicates and the number of characters occurred more than once in a string

Q1. What is Singly Linked List?
Ans. 
Singly Linked List is a linear data structure where each element points to the next element in the list.
• Each element in the list contains a data value and a reference to the next element in the list.

• Traversal is only possible in one direction, from the head to the tail.

• Insertion and deletion operations are efficient at the beginning of the list, but not at the end.

• Example: 1 -> 2 -> 3 -> 4 -> null
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Q2. What are Java 8 features?
Ans. 
Java 8 features include lambda expressions, functional interfaces, streams, default methods, and more.
• Lambda expressions allow functional programming in Java

• Functional interfaces enable the use of lambda expressions

• Streams provide a concise way to process collections

• Default methods allow interfaces to have implementation

• Date and Time API provides a better way to handle date and time

• Optional class helps to avoid null po...read more
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Q3. Difference between hashMap and hashTree
Ans. 
HashMap is an unordered collection while HashTree is a sorted collection.
• HashMap allows null values and keys while HashTree does not.

• HashMap is faster than HashTree for most operations.

• HashTree is thread-safe while HashMap is not.

• HashTree is used in situations where sorting is required.

• Example: HashMap - HashMap map = new HashMap<>(); HashTree - TreeMap map = new TreeMap<>();
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