JAVA 8 INTERVIEW QUESTION FIND DUPLICATE INTEGERS LIST IN JAVA USING STREAM FUNCTIONS | InterviewDOT
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Date: 01/05/2021

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JAVA 8 INTERVIEW QUESTION FIND DUPLICATE INTEGERS LIST IN JAVA USING STREAM FUNCTIONS | InterviewDOT

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What are the functional interfaces in Java?
The term Java functional interface was introduced in Java 8. A functional interface in Java is an interface that contains only a single abstract (unimplemented) method. A functional interface can contain default and static methods which do have an implementation, in addition to the single unimplemented method.

What is the advantage of functional interface in Java 8?
The reason it's called a "functional interface" is because it effectively acts as a function. Since you can pass interfaces as parameters, it means that functions are now "first-class citizens" like in functional programming languages. This has many benefits, and you'll see them quite a lot when using the Stream API.

What are predicate in Java?
Predicates in Java are implemented with interfaces. Predicate T is a generic functional interface representing a single argument function that returns a boolean value. It contains a test T t method that evaluates the predicate on the given argument. ... In Java we do not have standalone functions.