15. UnaryOperator vs Function - Functional Interface Java Inteview

#java #interviewquestions #webencyclop

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In this series we will be covering all Java interview questions and answers. This is going to be comprehensive list of Java interview questions which can help experienced Java developers to prepare for an interview as well as upskilling the Java knowledge.

I would always recommend everyone to watch Durga Sir (durgasoft) videos because of extensive in depth explaination on all topics if you have more time.
But here we will try to cover important aspects of Java Programming which are always asked in interviews withing less time.

A UnaryOperator is essentially a special type of function that operates on one input value and produces a result of the same type. It encapsulates a transformation or operation that can be applied to an object of type T.

This functional interface is defined with the @FunctionalInterface annotation, indicating that it is intended for use with lambda expressions or method references. It extends the Function interface, signifying that it is a subtype of the more general Function interface. However, unlike Function, UnaryOperator enforces that both the input and output types of the function must be of the same type T.

The UnaryOperator interface provides a single abstract method called "apply," which takes an argument of type T and returns a value of the same type T. This method represents the transformation or operation that the UnaryOperator performs on the input value. It takes one argument of type T and returns a result of the same type T.

One of the primary advantages of using UnaryOperator is that it promotes code reuse and functional composition. Since UnaryOperator is a functional interface, it can be implemented using lambda expressions or method references. This allows for concise and expressive definitions of transformations or operations.

For example, we can define a UnaryOperator Integer named "square" that squares an input integer. Using a lambda expression, we implement the "apply" method, which takes an integer "x" and returns the square of "x." We can then apply this UnaryOperator to a value, such as 5, resulting in a square of 25.

UnaryOperator can also be combined with other functional interfaces and APIs provided by Java, such as Streams and Optional. For instance, the Stream interface offers the "map" method, which can accept a UnaryOperator to transform each element of the stream. This enables complex transformations and operations on data.

The UnaryOperator interface is a crucial component of functional programming in Java. It provides a standardized way to define and use unary operations or transformations. By leveraging UnaryOperator and other functional interfaces effectively, Java developers can embrace the power of functional programming paradigms, resulting in more modular, maintainable, and scalable code.

[smarttrupti]

Your videos are helpful. Can u plz make next videos of this series please?

[aniruddharaje]

Could you please make a video on Filter, AOP and Interceptor?

[thangamayilmayil]

Sir please share all the topics of oops concept in java, String, array, exception, multiple threading, collections