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Stream.filter()

We can filter a stream using the filter() method. Let's filter the stream obtained from the languages list to filter items starting with E, as shown in the following code:

stream.filter( item -> item.startsWith("E") ); 

The filter() method takes a Predicate as a parameter. The predicate interface contains a function called boolean test(T t) that takes a single parameter and returns a boolean. In the preceding example, we passed the lambda expression item -> item.startsWith("E") to the test() function.

When the filter() method is called on a Stream, the filter passed as a parameter to the filter() function is stored internally. The items are not filtered immediately. 

The parameter passed to the filter() function determines ...