CODEWITHSUNDEEP
javalambdasettergetter
Kowser
Kowser

Reputation: 8261

Lambda expression for setter

We have lambda expression for getter as below:

Function<Student, String> studentNameGetter = Student::getName;

How about lambda expression for the setter?

Upvotes: 37

Views: 28118

Answers (2)

dvlcube
dvlcube

Reputation: 1306

Just to include a concrete example where something like this could be useful:

public static <T extends Serializable> void ifNotNull(Consumer<T> setter, Supplier<T> supplier) {
    if (supplier != null && supplier.get() != null) {
        setter.accept(supplier.get());
    }
}

public static void main(String[] args) {
    Model a = new Model();
    a.setName("foo");

    Model b = new Model();
    b.setName("bar");

    ifNotNull(b::setName, a::getName);
}

The ifNotNull method receives a setter and a getter but only calls the setter if the result of the getter isn't null.

Upvotes: 0

Keppil
Keppil

Reputation: 46209

I'm not sure what you mean by creating a lambda expression for the setter.

What it looks like you are trying to do is to assign the method reference to a suitable Functional Interface. In that case, the best match is to a BiConsumer: 

BiConsumer<Student, String> studentNameSetter = Student::setName;

Upvotes: 72

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