Fetch Key from a Key-Value Tuple in Java

To fetch the key from a KeyValue tuple in Java, use the getKey() method. Let us first see what we need to work with JavaTuples. To work with KeyValue class in JavaTuples, you need to import the following package:

import org.javatuples.KeyValue;

Note: Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for all the steps to run JavaTuples:

Steps: How to run JavaTuples program in Eclipse

The following is an example to fetch the key from a KeyValue tuple in Java:

Example

import org.javatuples.KeyValue;
public class Demo {
   public static void main(String[] args) {
      KeyValue<Integer, String> kValue = KeyValue.with(2, "Rank");
      System.out.println("Key-Value in the KeyValue Tuple = "+kValue);
      System.out.println("Key = "+kValue.getKey());
   }
}

Output

Key-Value in the KeyValue Tuple = [2, Rank]
Key = 2