Check if a particular value exists in Java TreeMap example

This Java Example shows how to check if TreeMap object contains a particular value using containsValue method of TreeMap class.

import java.util.TreeMap;

public class CheckParticularValueExistTreeMapExample {

 public static void main(String[] args) {

  // create object of TreeMap

  TreeMap phoneBook = new TreeMap();

  // add key value pairs to TreeMap

  phoneBook.put("John", "245745");
  phoneBook.put("Joy", "245786");
  phoneBook.put("Roy", "233783");

  /**
   * To check whether a particular value exists in
   * TreeMap use boolean containsValue(Object key) 
   * method of TreeMap class. It returns true if
   * the value is mapped to one or more keys in the
   * TreeMap otherwise false.
   **/

  boolean blnExists = phoneBook.containsValue("245745");

  System.out.println("Phone number '245745' exists in TreeMap ? : "
    + blnExists);

 }
}

The output is:


Phone number '245745' exists in TreeMap ? : true