1. Introduction In this article I will discuss how to assert an Optional. I have written a series of articles on Optional, which includes introduction, […]

1. Overview Generally speaking, container is an object such as box which can be used to hold something. In programming container means the same thing. […]

Collections aka containers are used to group objects into single entity. Once the objects are stored in a collection you can then perform operations on […]

1. Introduction In this article, we will be go through the new methods added in Boolean class under package java.lang. Boolean class wraps up the […]

1. Introduction In this article we will see how to convert an array i.e. primitive and object array to List. The following methods acts as […]

1. Introduction In this article we will see how to reverse the elements in a primitive array as well as in object array. We will […]

1. Introduction In this post we will see how to convert List<E> to array in 4 different ways. The following methods acts as a bridge […]

Fail-Fast iterators throw ConcurrentModificationException if the Collection is modified structurally. Fail-Fast iterators fail quickly and cleanly rather than risking the arbitrary non-deterministic behavior at undetermined […]

ConcurrentModificationException is thrown by methods when they discover concurrent modification of object which such modifications are not permitted. So if the collection is modified structurally […]

1. Introduction In this article, we will see how to traverse the List in a few different ways. This includes traversing using Iterator and without […]

Optional<T> class encapsulates the optional value. Optional value means that either the value might or might not be present. It represents immutable container of non-null […]

1. Introduction Optional class was introduced in Java 8 to so as to provide a mechanism to represent whether a result is present or not. […]

1. Introduction In this article we will see about best practices for returning collections. It is common thing to return null from a method whose […]

Below is the difference between Hashtable and HashMap: In terms of Null keys and Null values Hashtable does not allows null keys or values. If […]

1. Introduction In this article, I will show you how to traverse the Map in 7 different ways. Map is an interface that stores key-value […]

Embed from Getty Images Fibonacci Series: Fibonacci series is a series of numbers which are built up based on previous numbers. Example: f(1) – The […]

1. Introduction In this article, we will go through the new methods added in String class in Java 8 under package java.lang. A little about […]