Java 8 - Predefined Functional Interface

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Predefined Functional Interface are,
1. Predicate
2. Function
3. Consumer
4. Supplier
etc.,

These all are defined the package : java.util.function.

 Functional Interface:
* A interface which contain must only one abstract method.

* And It may contain multiple default method and static methods.
eg. Comparable, Runnable etc.,


interface Predicate<T>
{
boolean test(T t);
}

test() - abstract method
negate() - default method
and() - default method
or() - default method
isEqual() - static method

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