Write a program to display most frequent element in an array using Streams and Lambda expression. Difference between ArrayList and HashSet. What is the use of default method in interface? Difference between String Buffer and String Builder. What is Concurrent HashMap? What are the different ways to declare a string?

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Answers to technical interview questions on Java programming language.

To display most frequent element in an array using Streams and Lambda expression, use Collectors.groupingBy() and Collectors.counting() methods.
ArrayList is an ordered collection of elements while HashSet is an unordered collection of unique elements.
Default methods in interface are used to provide a default implementation of a method that can be overridden by implementing classes.
StringBuffer is synchronized while StringBuilder is not. StringBuffer is thread-safe while StringBuilder is not.
ConcurrentHashMap is a thread-safe implementation of HashMap that allows multiple threads to access and modify the map concurrently.
Different ways to declare a string are: using string literals, using new keyword, using character array, using StringBuffer or StringBuilder.

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