This example also shows the flexibility of Java’s type inference and method reference mechanics in the context of its functional programming capabilities. Suppose you have a list of Mascot objects.

There are several ways to find duplicates in a Java List, array or other collection class. The following list describes some of the most commonly used approaches: Use a method in the Java Streams API ...

A class implements an interface by appending Java’s implements keyword followed by a comma-separated list of interface names to the class header, and by coding each interface method in the class.

Another approach to find duplicates in a Java list is to use the frequency method of the Collections class. This example prints out the number of times each unique element in the List occurs, which is ...