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Java Hashtable containsValue() Method with Example

Hashtable Class containsValue() method: Here, we are going to learn about the containsValue() method of Hashtable Class with its syntax and example.
Submitted by Preeti Jain, on February 17, 2020

Hashtable Class containsValue() method

• containsValue() method is available in java.util package.
• containsValue() method is used to check whether this table Hashtable associated one or more keys to the given value element (val_ele).
• containsValue() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• containsValue() method may throw an exception at the time of checking the key elements associated with the given value element (val_ele).
  NullPointerException: This exception may throw when the given parameter is null exists.

Syntax:

    public boolean containsValue(Object val_ele);

Parameter(s):

• Object val_ele – represents the value element (val_ele) is to be checked.

Return value:

The return type of the method is boolean,

• It returns true when at least one keys associated with the given value element (val_ele).
• It returns false, when none keys associated with the given value element (val_ele).

Example:

// Java program to demonstrate the example 
// of boolean containsValue(Object val_ele) 
// method of Hashtable 

import java.util.*;

public class ContainsValueOfHashtable {
    public static void main(String[] args) {
        //Instantiate a hashtable object  
        Hashtable ht = new Hashtable();

        // By using put() method is to
        // add the linked values in an Hashtable
        ht.put(10, "C");
        ht.put(20, "C++");
        ht.put(30, "JAVA");
        ht.put(40, "PHP");
        ht.put(50, "SFDC");

        // Display Hashtable
        System.out.println("Hashtable: " + ht);

        // By using containsValue() method is to
        // check whether the given value element
        // atleast holds one key element or not
        // in this Hashtable

        boolean status = ht.containsValue("JAVA");

        // Display Status
        System.out.println("ht.containsValue(JAVA): " + status);
    }
}

Output

Hashtable: {10=C, 20=C++, 30=JAVA, 40=PHP, 50=SFDC}
ht.containsValue(JAVA): true