Java 8 Lambda Functional Interfaces

Topics • Java 8 provided Functional Interface definitions > Simply typed functional interfaces > Generically typed functional interfaces • Usage example of Predicate • Usage example of Function • Composition

Java 8 Provided Functional Interfaces

Functional Interfaces defined in Java 8

Java 8 comes with a set of commonly used functional interfaces in java.util.function package - so you don't have to define your own anymore
There are two kinds of Java 8 provided functional interfaces
- Simply typed
- Generically typed
As a developer, you still need to know the method signature (method name and arguments) of these functional interfaces
- Although Lambda expressions don't refer to the method name of the functional interface, your code still needs to call that method

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