Iterate through keys of hashtable java

Hashtable java Collections interview Questions

1.Basic java example program to iterate keys of hashtable

• Enumeration keys()   This method used to get keys of hashmap
  

1. package com.iteartekeysHashtable;
2.  
3. import java.util.Hashtable;
4. 
   
5. import java.util.Enumeration;
6.  
7. public class HashtableExample{
8.  
9. public static void main(String[] args) {
10.   
11.  //create Hashtable object
12.        Hashtable<String,String> hashtable = new Hashtable<String,String>();
13.        
14. //add key value pairs to Hashtable
15. hashtable.put("1","Java Interview Questions");
16. hashtable.put("2","Java Interview Programs");
17. hashtable.put("3","Concept and exampe program");
18. hashtable.put("4","Concept and interview Questions");
19. hashtable.put("5","Java Quiz");
20. hashtable.put("6","Real time examples");
21.  
22.  
23.  
24. Enumeration e=hashtable.keys();
25.           
26.  
27.            
28. // display search result
29.  while (e.hasMoreElements()) {
30.         System.out.println(e.nextElement());
31. }    
32. 
    
33. }
34.  
35. }
     

Output:

1. 6
2. 5
3. 4
4. 3
5. 2
6. 1

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Iterate through keys of hashtable java

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