So for instance, commons-collections has org.apache.commons.collections. Collection Utils, which has lots of static methods that take objects passed in, to pick one at random, there's one called exists with this signature: I know this is a rather old post but I have another slightly simpler solution.
Without lambda expressions: "A functional interface is an interface that has one and only one abstract method, although it can contain any number of default methods (new in Java 8) and static methods" what are you saying, that in Java 8 we now can have static methods in interfaces?
Thanks to Java 8 you don't need to do the steps below to pass a function to a method, that's what lambdas are for, see Oracle's Lambda Expression tutorial.
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In response to your comment below you could say: is an interface that has one and only one abstract method, although it can contain any number of default methods (new in Java 8) and static methods.
A lambda expression can quickly implement the abstract method, without all the unnecessary syntax needed if you don't use a lambda expression.
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