Category: Java

In this post, several methods are discussed to merge multiple sets in Java into a single set using plain Java, Java 8, Guava, and Apache Commons.

A Multimap is a map that allows mapping of a single key to multiple values. This post will discuss how to implement a Multimap in Java.

This article will discuss Guava Lists class, which provides several static utility methods pertaining to List instances in Java.

This post will discuss the flatMap() method in Java, which is used to flatten streams in Java.

This post will discuss how to reverse elements of a stream in Java. In other words, create a new stream that iterates the elements of the specified stream in reverse order.

This post will check if a check if a String matches one of the given prefixes in Java.

This post will discuss the difference between an Iterator and ListIterator interface in Java, which is used for traversing over elements of a Collection.

This post will discuss how to read all text from a file into a string in Java.

This post will discuss how to get the value of a System property or an environment variable in Java.

This post will discuss how to copy an object in Java using the clone() method in Object class and one provided by Apache Commons Lang. We will also discuss shallow copy and deep copy in detail. Cloning an object creates a copy of an existing object to modify or move the copied object without impacting […]

This article will discuss different ways to create a mutable, unmodifiable, immutable, and fixed-length empty map in Java.

This post will discuss how to convert the object array to an Integer array in Java.