java.util.function package

java.util.function package

Java 8 introduced new package and introduced many functional interface. It can be divided into four categories.

  • Predicate
  • Consumer
  • Function
  • Supplier

Predicate

It represents a boolean-valued function of one argument. It is a functional interface with method test(T) where T is typed.

You can see the usage here.

Consumer

It represents an operation accept(s) argument(s) and return void with side-effects. Java 8 introduced many versions of Consumers.

You can see the usage of Consumer here.

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