Learn to convert a ResultSet in to a HashMap in Java.

Explore the nuances of comparing Number objects, and find detailed insights and code examples for each strategy.

Learn how to convert a HashSet into an array using the toArray() method of the HashSet class.

In-memory HTTP server, SSL hot reloading, Kotlin multi-platform, new reactor features, and API versioning!

Explore various approaches to converting a Hex String into an int in Java.

Learn the difference between final static and static final.

Learn about mutable Strings and ways of mutating a String.

Learn various methods for retrieving the first and last key-value pairs from a LinkedHashMap

Explore ways of transforming a stream into a Map or Multimap in Java using various approaches and libraries.

Learn about the Vector class and explore some of its most common operations and methods.

Learn how to round the date using the java.util.Date, as well as LocalDateTime and ZonedDateTime.

Learn various ways to locate the n-th occurrence of a substring within a string using iterative, recursive, and regex-based solutions.

In this tutorial, we learn how to iterate over the characters of a String in Java.

Learn how to obtain the first date of the current month in Java using JDK classes and third-party libraries like Joda Time.

Learn how to check if a Java string contains only Unicode letters.

Learn how to compare two StringBuilder objects in Java releases before and after Java 11.

Explore best practices for using the @param tag to document generic type parameters.

Discover the common mistakes made while modifying the elements in a Java Stream and the correct way to do it.

Learn how to convert a file into a byte array in Java.

In this article we present a collection of top 40 Java 8 interview questions along with in-depth answers