Java 8 features- class 12 - Function interface - andThen, compose ,identity methods
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Function interface:-
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1. It is a functional interface that was introduced in JDK1.8 version.
2. it is available in java.util.function package.
3. It has an abstract method which is apply() method.
4. interface Function T,R
{
R apply(T t);
}
5. It is used extensively in functional programming and stream operations.
6. Please be informed that there are 2 default methods in the Function interface which are andThen() and compose() methods. They are used to write a complex function.
7. There is also a static method inside the Function interface which is called as identity() Method.
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