Map Java 8 Example

Map () can be used where we have to map the elements of a particular collection to a certain function, and then we need to return the stream which contains the updated results. Multiplying all the elements of the list by 3 and returning the updated list. Created a list of strings created stream from list call map () method with a lambda expression to iterate stream of elements apply filter to each element to check event number

Create a map from list with key as an attribute. Otherwise, it's just a simple foreach() as described previously. Let's take entryset() as the example to see how stream api works:

For example, invoking the putall (map) method on an unmodifiable map may, but is not required to, throw the exception if the map whose mappings are to be superimposed is empty.

Stream is an interface and t is the type of stream elements. Click to tweet example 1. Here, we will go through several examples to understand this feature. Map () returns a stream consisting of the results of applying the given function to the elements of this stream.