java.util.Hashtable.contains() Method


The contains(Object value) method is used to test if some key maps into the specified value in this hashtable.


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

public boolean contains(Object value)


value − This is the a value to be searched.

Return Value

The method call returns true if and only if some key maps to the value argument in this hashtable.


NullPointerException − This is thrown if the value is null.


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

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 "C"
      boolean isavailable = htable.contains("C");

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

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

Hash table contains 'C': true
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