Google Guava provides ways to create Immutable Collections. In this post, we will learn to create immutable collections using Google Guava.

An EnumMap in Java is a specialized map implementation for use with enum type as the keys. In this post, we will learn EnumMaps in Java.

In this post, we will see six ways to convert a Java stream to a List. You can extend these if you want to convert a stream to a Set as well.

The Java 8 LongStream is a sequence of primitive long-valued elements and is a long primitive specialization of Stream.

Collectors.joining returns a Collector which concatenates the stream elements separated by a delimiter, prefix and suffix in encounter order.

Java 8 StringJoiner class can be used to build a sequence of characters that are separated by a configured delimiter, prefix and a suffix.

This post shows 4 ways to throw checked exceptions in Java streams i.e., having a lambda expression that can throw checked exception(s).

Java Streams has a distinct method which removes duplicates by object’s equal method. This post explains ways to apply distinct by a property.

The Java Stream Distinct is a stateful intermediate operation which returns a new stream which has only the distinct elements in it.

The Java 8 Streams has findFirst and findAny methods which will return the first element and an arbitrary element from a stream respectively.