How to pass null into Pair in Java

Question

I'm new to Java. I'm creating an app in android, and I created a method that takes a varargs of Pair<String, String>. But I can't seem to pass null in. Is this possible?

Method:

makeJson(Pair<String, String>... keyValuePairs) {
...
}

Caller:

makeJson(Pair.create("reference", null));

Pair is not standard Java class. Please specify library where you get it. — Dmitry Gorkovets, Jan 30 '17 at 05:43
And yes it is possible to write `Pair.create("reference", null)`. What type of error do you have? — Michael Spitsin, Jan 30 '17 at 05:47
@MichaelSpitsin thanks. The IDE doesn't show errors anymore. I will try it out and report back. — user1422348, Jan 30 '17 at 05:47
Please follow below link [This link will help you Link](http://stackoverflow.com/questions/521171/a-java-collection-of-value-pairs-tuples) — Rahul Karande, Jan 30 '17 at 05:49
If anyone in this thread downvoted the question, would you mind sharing why? It's kind of pointless otherwise. — user1422348, Jan 30 '17 at 06:02
@user1422348 I prepared and designed an answer for you. Please check it. :) — Michael Spitsin, Jan 30 '17 at 06:07

score 2 · Accepted Answer · answered Jan 30 '17 at 06:06

2

You can use just ordinary Pair's constructor:

new Pair<String, String>("reference", null)

And according link to the source code of Pair.java:

public static <A, B> Pair<A, B> create(A a, B b) {
    return new Pair<A, B>(a, b);
}

Static method create just invokes constructor so it should work with nulls.

answered Jan 30 '17 at 06:06

Michael Spitsin

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Pair Class from util in spring data does not allow these null values: private Pair(@NonNull S first, @NonNull T second) {... – NicoESIEA Dec 28 '22 at 16:21

score -1 · Answer 2 · answered Jan 11 '21 at 20:37

-1

Better way to handle this will be to use Optional,

Pair.of(Optional.of(?), Optional.of(Object B))

answered Jan 11 '21 at 20:37

Meet Shah

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How to pass null into Pair in Java

2 Answers2