7- Built-in Functional Interfaces

Jun 29, 2026 19:08 · 1:42 · English · Whisper Turbo · 2 Speaker

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Java provides many predefined functional interfaces that we can use to perform

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common tasks.

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These interfaces are declared in this package.

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Java that you tell that function.

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So as you can see we have quite a few interfaces here that

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we can use to perform common tasks.

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Now the list may appear overwhelming but trust me this is actually easier

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than you think.

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You basically have four types of functional interfaces in Java.

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We have consumers,

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suppliers,

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functions,

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and predicates.

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All the interfaces you saw fall into these four categories.

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First,

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I'm going to give you a very brief explanation of each of these types,

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and then over the next few videos,

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we're going to study each of these in detail.

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So the consumer interface represents an operation that takes

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a single argument and returns no result.

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That is why it's called consumer,

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because it consumes a value.

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For example,

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this printer interface that we declared,

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this is very similar to the consumer interface in Java because

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this print method simply consumes this message.

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It takes a single argument and doesn't return a value.

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The supplier interface is the opposite of the consumer interface.

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It represents an operation that takes no input and returns a value.

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So it supplies a value.

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The function interface represents a function that can map a value to a different value.

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And the predicate interface represents an operation that takes an object and

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checks to see if that object satisfies some criteria.

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We use this in filtering data.

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For example,

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with the predicate interface,

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we can get the customers who don't have a phone number or courses that

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are older than two years.

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Next,

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we're going to look at the consumer interface.

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