java.util.Hashtable.containsValue() Method


The containsValue(Object value) method is used to test if this Hashtable maps one or more keys to this value.


Following is the declaration for java.util.Hashtable.containsValue() method.

public boolean containsValue(Object value)


value − This is the a value to be searched.

Return Value

The method call returns 'true' if this map maps one or more keys to the specified value.


NullPointerException − This is thrown if the value is null.


The following example shows the usage of java.util.Hashtable.containsValue()

package com.tutorialspoint;

import java.util.*;

public class HashTableDemo {
   public static void main(String args[]) {
      // create hash table 
      Hashtable htable = new Hashtable();

      // put values into the table
      htable.put(1, "A");
      htable.put(2, "B");
      htable.put(3, "C");
      htable.put(4, "D");

      // check if table contains value "D"
      boolean isavailable = htable.containsValue("D");

      // display search result
      System.out.println("Hash table contains value 'D': "+isavailable);

Let us compile and run the above program, this will produce the following result.

Hash table contains value 'D': true
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