Check particular value exist in hashtable

Hashtable java Collections interview Questions

1.Basic java example program to check particular value exist in hashtable

• boolean contains(Object value)   This method used to check  particular value exist in hashtable

1. package com.CheckElelemtHashtable;
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.  To check whether a particular value exists in Hashtable we need to use
24.  boolean containsKey(Object value) method of Hashtable class.
25. if the Hashtable contains mapping for specified value It returns true
26. otherwise returns false.
27. */
28.        
29.  boolean isExists = hashtable.contains("Java Quiz");
30.  System.out.println("Java Quiz exists in Hashtable ? : " + isExists);
31. 
    
32. System.out.println("Hashtable values : ");
33.  
34. Enumeration e=hashtable.elements();
35.           
36.  
37.            
38. // display search result
39.  while (e.hasMoreElements()) {
40.         System.out.println(e.nextElement());
41. }    
42. 
    
43. }
44.  
45. }
     

Output:

1. Java Quiz exists in Hashtable ? : true
2. Hashtable values : 
3. Real time examples
4. Java Quiz
5. Concept and interview Questions
6. Concept and exampe program
7. Java Interview Programs
8. Java Interview Questions

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Check particular value exist in hashtable

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