13- The Predicate Interface

Jul 01, 2026 03:38 · 2:02 · English · Whisper Turbo · 2 Speaker

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Another type of functional interface we have in Java is the predicate interface,

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which is extremely useful.

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It has tons of applications in the real world.

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We use this interface to filter data.

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I will show you how to do that in the next section.

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So over here,

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you can see that this interface has a single abstract method

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called test.

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We give it an object of type T and get a boolean.

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So with this method,

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we can check to see if this object satisfies some criteria.

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For example,

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we can give it a customer object and check to see if that customer has a balance.

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This is how we use this interface for filtering data.

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Now,

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just like the other interfaces,

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we have a few specializations of this interface.

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For example,

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we have by predicate which takes two arguments and returns a

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boolean.

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Take a look.

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So, here's a test method,

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it has two arguments of type T and U,

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and it returns a boolean.

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We also have primitive specializations of this interface.

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For example,

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we have int predicate,

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which takes a primitive integer and returns a boolean.

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We also have long predicate and double predicate.

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Now let me show you how to work with the predicate interface in Java.

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Let's say we have a string like sky,

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and we want to check to see if this string has more than five characters.

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So we declare a predicate of string call

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it is longer than five and send it

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to a lambda expression like this str goes to str

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.length is greater than five.

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Once again,

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we don't have a return keyword.

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We don't have curly braces either.

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All we have is a boolean expression because we should return a

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boolean value.

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Now to use this predicate we call is

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longer than five dot test.

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We give it our input like sky and then get the result.

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Next,

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I'm going to show you how to combine predicates to build more complex predicates.

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