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1.Basic java collection framework example program to get set view from hashtable

  • Set keySet()   This method used to get set view of the keys of hashtable
  •  Important note is that if any key is removed from set the original hashtable key also removed
  1. package com.setviewHashtable;
  2.  
  3. import java.util.Hashtable;

  4. import java.util.Enumeration;
  5. import java.util.Iterator;
  6. import java.util.Set;
  7.  
  8. public class HashtableExample{
  9.  
  10. public static void main(String[] args) {
  11.   
  12.  //create Hashtable object
  13.        Hashtable<String,String> hashtable = new Hashtable<String,String>();
  14.        
  15. //add key value pairs to Hashtable
  16. hashtable.put("1","Java Interview Questions");
  17. hashtable.put("2","Java Interview Programs");
  18. hashtable.put("3","Concept and example program");
  19. hashtable.put("4","Concept and interview Questions");
  20. hashtable.put("5","Java Quiz");
  21. hashtable.put("6","Real time examples");
  22.  
  23.  
  24.  Set st = hashtable.keySet();       
  25.  System.out.println("Set created from Hashtable Keys contains :");
  26. //iterate through the Set of keys
  27.  
  28.  Iterator itr = st.iterator();
  29.  while(itr.hasNext())
  30.  System.out.println(itr.next());
  31.            
  32.  st.remove("1");
  33.            
  34. System.out.println("Elements in hash table");
  35. Enumeration e=hashtable.keys();
  36.         
  37.  
  38.  while (e.hasMoreElements()) {
  39.         System.out.println(e.nextElement());
  40. }    

  41. }
  42.  
  43. }
     



Output:

  1. Set created from Hashtable Keys contains :
  2. 6
  3. 5
  4. 4
  5. 3
  6. 2
  7. 1
  8. Elements in hash table
  9. 6
  10. 5
  11. 4
  12. 3
  13. 2

Instance Of Java

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