Skip to Content

Check if a particular value exists in Java Hashtable example

  • strict warning: Non-static method view::load() should not be called statically in /home/javaexa1/public_html/sites/all/modules/views-6.x-2.16/views/views.module on line 906.
  • strict warning: Declaration of views_handler_argument::init() should be compatible with views_handler::init(&$view, $options) in /home/javaexa1/public_html/sites/all/modules/views-6.x-2.16/views/handlers/views_handler_argument.inc on line 0.
  • strict warning: Declaration of views_handler_filter::options_validate() should be compatible with views_handler::options_validate($form, &$form_state) in /home/javaexa1/public_html/sites/all/modules/views-6.x-2.16/views/handlers/views_handler_filter.inc on line 0.
  • strict warning: Declaration of views_handler_filter::options_submit() should be compatible with views_handler::options_submit($form, &$form_state) in /home/javaexa1/public_html/sites/all/modules/views-6.x-2.16/views/handlers/views_handler_filter.inc on line 0.
  • strict warning: Declaration of views_handler_filter_boolean_operator::value_validate() should be compatible with views_handler_filter::value_validate($form, &$form_state) in /home/javaexa1/public_html/sites/all/modules/views-6.x-2.16/views/handlers/views_handler_filter_boolean_operator.inc on line 0.
  • strict warning: Declaration of views_plugin_style_default::options() should be compatible with views_object::options() in /home/javaexa1/public_html/sites/all/modules/views-6.x-2.16/views/plugins/views_plugin_style_default.inc on line 0.
  • strict warning: Declaration of views_plugin_row::options_validate() should be compatible with views_plugin::options_validate(&$form, &$form_state) in /home/javaexa1/public_html/sites/all/modules/views-6.x-2.16/views/plugins/views_plugin_row.inc on line 0.
  • strict warning: Declaration of views_plugin_row::options_submit() should be compatible with views_plugin::options_submit(&$form, &$form_state) in /home/javaexa1/public_html/sites/all/modules/views-6.x-2.16/views/plugins/views_plugin_row.inc on line 0.

  1. /*
  2.   Check if a particular value exists in Java Hashtable example
  3.   This Java Example shows how to check if Hashtable object contains a particular
  4.   value using contains method of Hashtable class.
  5. */
  6.  
  7. import java.util.Hashtable;
  8.  
  9. public class CheckValueOfHashtableExample {
  10.  
  11.   public static void main(String[] args) {
  12.    
  13.     //create Hashtable object
  14.     Hashtable ht = new Hashtable();
  15.    
  16.     //add key value pairs to Hashtable
  17.     ht.put("1","One");
  18.     ht.put("2","Two");
  19.     ht.put("3","Three");
  20.    
  21.     /*
  22.       To check whether a particular value exists in Hashtable use
  23.       boolean contains(Object key) method of Hashtable class.
  24.       It returns true if the value is mapped to one or more keys in the
  25.       Hashtable otherwise false.
  26.     */
  27.    
  28.     boolean blnExists = ht.contains("Two");
  29.     System.out.println("Two exists in Hashtable ? : " + blnExists);
  30.   }
  31. }
  32.  
  33. /*
  34. Output would be
  35. Two exists in Hashtable ? : true
  36. */