Java-8-Supplier

interface Supplier<T>

源码:

@FunctionalInterface
public interface Supplier<T> {

    
    T get();
}

这个接口，只是为我们提供了一个创建好的对象，这也符合接口的语义的定义，提供者，提供一个对象，直接理解成一个创建对象的工厂，就可以了

简单例子

public class M1 {


    public static void main(String[] args) {

        Supplier<String> supplier1 = String::new;

        System.out.println(supplier1.get());

        System.out.println("---------------");

        Supplier<List<Integer>> supplier2 = ()->
                Create_Data.supply_Integers();

        System.out.println(
                supplier2.get()
        );

        System.out.println("---------------");

        Supplier<List<Person>> supplier3 = ()->
                Create_Data.supply_Persons();

        System.out.println(
                supplier3.get()
        );

        
    }
}

针对特定类型

DoubleSupplier IntSupplier BooleanSupplier LongSupplier

public class M2 {


    public static void main(String[] args) {

        DoubleSupplier doubleSupplier = ()->
                454.252;

        System.out.println(doubleSupplier.getAsDouble());

        System.out.println("---------------------");

        IntSupplier intSupplier = ()->
                100;

        System.out.println(intSupplier.getAsInt());


}
}