Java 8 Stream.flatMap() method is used to flatten stream of collections to a stream of objects. In short, we can say that it allows us to combine the objects from multiple collections into a single collection.

In this article, let’s check how we can group elements in a given List to a Java Map.

In this article, we’ll introduce the method to find the common elements between two lists in Java.

There are three ways to receive list or array of objects via @RequestBody annotation.

In this article, we’ll introduce the method to find the differences between two lists in Java. There are a few different approaches, let’s go through them one by one.

In this article, let’s check how we can convert a given List to a Java Map.

Combing or merging lists is very common and frequent operation, these lists could be ArrayLists or LinkedLists. In this article, we are going to discuss for joining or concatenating or merging two or more lists into single list.