DoublePredicate Interface in Java 8 with examples

This entry is part 26 of 43 in the series Java 8 Functional Interfaces

DoublePredicate Interface is a part of the java.util.function package which is introduced in Java 8. It is an in-built Functional Interface. This function expect one double-valued argument as an input and produces a boolean value as an output. As it is a functional interface, it can be used assignment target for lambda expression or method reference. In this post, we are going to see several implementations of DoublePredicate Interface by using different examples.

DoublePredicate_Interface_Java8_Techndeck

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Look at DoublePredicate Javadoc description below:

DoublePredicateInterface_Signature_Java8_Techndeck

 

 

 

 

DoublePredicate Interface contains 4 methods:

  1. test

  2. and

  3. or

  4. negate

Let’s discuss these methods:

test 

This method evaluates predicate on the given argument and produces a boolean result.

and 

This method returns a composed predicate that represents a short-circuiting logical AND of this predicate and another. When evaluating the composed predicate, if this predicate is false, then the other predicate is not evaluated.

or 

This method returns a composed predicate that represents a short-circuiting logical OR of this predicate and another. When evaluating the composed predicate, if this predicate is true}, then the other predicate is not evaluated.

negate 

This method returns a predicate that represents the logical negation of this predicate.

 

Lets understand above mentioned methods thorough various examples:

Example 1. ‘test’ method

 

Example 2. ‘and’, ‘or’ and ‘negate’ methods

Java 8 DoublePredicate Interface is an absolute useful addition as part of ‘Functional Interfaces’ and can serve variety of purposes. It is quite powerful as it can be used as a higher order functions through lambda functions and above examples could help you to get better idea on how to implement it.

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