The contains() method of the Java LabelValue Tuple

Use the contains() method of the LabelValue class in Java to search for a value. The return value of the method is TRUE if the value exists in the tuple, else the FALSE value is returned.

Let us first see what we need to work with JavaTuples. To work with LabelValue class in JavaTuples, you need to import the following package−

import org.javatuples.LabelValue;

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 −

StepsHow to run JavaTuples program in Eclipse

The following is an example to implement the contains() method of the LabelValue class in Java −


import org.javatuples.LabelValue;
public class Demo {
   public static void main(String[] args) {
      LabelValue<Integer, String> lv = new LabelValue<Integer, String>(5, "Rank");
      System.out.println("LabelValue Tuple = "+lv);
      System.out.println("Get the key = "+lv.getLabel());
      System.out.println("Get the value = "+lv.getValue());
      System.out.println("Does the value exist = "+lv.contains(500));


The following is the output:
LabelValue Tuple = [5, Rank]
Get the key = 5
Get the value = Rank
Does the value exist = false