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In this post, we will see about java.util.function.Function functional interface. java.util.function.Function is part of java.util.function package. There are some inbuilt functional interfaces in java.util.function which you can use if functional interface matches with your requirement. java.util.function.Function is a functional interface which takes input single argument T and returns result R. It has an abstract method as below. Let’s understand with the help of an example. Java 8 function example When you run above program, you will get below output: Square root of 49: 7.0 Square root of 68: 8.246211251235321 andThen function It is default function and returns a composed function

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