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Get Size of Java Hashtable Example

  1. /*
  2.   Get Size of Java Hashtable Example
  3.   This Java Example shows how to get the size or nubmer of key value pairs
  4.   stored in Hashtable using size method.
  5. */
  6.  
  7. import java.util.Hashtable;
  8.  
  9. public class GetSizeOfHashtableExample{
  10.  
  11.   public static void main(String[] args) {
  12.    
  13.     //create Hashtable object
  14.     Hashtable ht = new Hashtable();
  15.    
  16.     /*
  17.       To get the size of Hashtable use
  18.       int size() method of Hashtable class. It returns the number of key values
  19.       pairs stored in Hashtable object.    
  20.     */
  21.     System.out.println("Size of Hashtable : " + ht.size());
  22.    
  23.     //add key value pairs to Hashtable using put method
  24.     ht.put("1","One");
  25.     ht.put("2","Two");
  26.     ht.put("3","Three");
  27.     System.out.println("Size of Hashtable after addition : " + ht.size());
  28.    
  29.     //remove one element from Hashtable using remove method
  30.     Object obj = ht.remove("2");
  31.     System.out.println("Size of Hashtable after removal : " + ht.size());
  32.   }
  33. }
  34.  
  35. /*
  36. Output would be
  37. Size of Hashtable : 0
  38. Size of Hashtable after addition : 3
  39. Size of Hashtable after removal : 2
  40. */