Detailed explanation of the usage of Supplier interface in Java

Explanation

This interface means provider. There is only one abstract get, no default method and static method. Import a pan-T, get method, Returns a pan-T.

Supplier is also used to create objects, but it is different from the traditional syntax for creating objects: new.

Supplier is different from Function. It does not accept parameters and directly produces the specified results for us, a bit like Producer pattern.

Examples

class Person {
    String firstName;
    String lastName;
 
    Person() {}
 
    Person(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }
}

What collection classes are there in Java

Collections in Java are mainly divided into four categories:

1, List List: ordered, repeatable;

2, Queue queue: ordered, repeatable;

3, Set collection: non-repeatable;

4, Map mapping: unordered, unique keys, non-unique values.

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