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This article shows you how to deeply understand java1.8 and know supplier. The content is concise and easy to understand. It will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Supplier is also used to create objects, but unlike the traditional syntax for creating objects: new, see the following code:

Public class TestSupplier {private int age

TestSupplier () {System.out.println (age)

} public static void main (String [] args) {

/ / create a Supplier container, declared as TestSupplier, and the object constructor will not be called, that is, the object Supplier sup= TestSupplier::new will not be created.

System.out.println ("-")

/ / when the get () method is called, the constructor of the object is called, and the real object sup.get () is obtained.

/ / each time get calls the constructor, that is, the object obtained is different sup.get ()

}}

Output result:

-00

Official code and comments:

/ * Represents a supplier of results. *

*

There is no requirement that a new or distinct result be returned each * time the supplier is invoked. *

*

This is a functional interface *

Whose functional method is {@ link # get ()}.

* * @ param the type of results supplied by this supplier

* * @ since 1.8 * / @ FunctionalInterfacepublic interface Supplier {

/ * Gets a result. *

* @ return a result * / T get ()

}

According to the code and official comments, my personal understanding is:

1.supplier is an interface with a get () method

two。 Syntax:

Supplier sup= TestSupplier::new

3. Each time the get () method is called, the constructor is called to create a new object.

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