1.Basic Java example program to check particular value exists in hashmap


  1. package com.javacheckvaluehashmap;
  2.  
  3. import java.util.Hashmap;
  4. import java.util.Iterator;
  5. import java.util.Map;
  6. import java.util.Map.Entry;
  7.  
  8. public class HashmapExample{
  9.  
  10. public static void main(String[] args) {
  11.   
  12. //create an Hashmap object
  13. HashMap<String, String> hashmap = new HashMap();
  14.        
  15. //Add key values pairs to hashmap
  16.         
  17. hashmap.put("1","One");
  18. hashmap.put("2","Two");
  19. hashmap.put("3","Three");
  20. hashmap.put("4","Four");
  21. hashmap.put("5","Five");
  22. hashmap.put("6","Six");       
  23.         
  24.  
  25.  /*
  26.  To check whether a particular value exists in HashMap use
  27.  boolean containsValue(Object value) method of HashMap class.
  28. containsValue(Object value) returns true if the HashMap contains mapping for specified
  29. value otherwise false.*/
  30.        
  31. boolean isExists = hashmap.containsValue("Six");
  32. System.out.println("The value Six exists in HashMap ? : " + isExists);
  33.     
  34.  
  35. if(!hashmap.isEmpty()){
  36.  
  37. Iterator it=hashmap.entrySet().iterator();
  38.              
  39. while(it.hasNext()){

  40. Map.Entry obj=(Entry) it.next();
  41. System.out.print(obj.getKey()+" ");
  42. System.out.println(obj.getValue());
  43.              
  44. }           
  45. }   
  46.  
  47. }
  48.  
  49. }
     



Output:

  1. The value Six exists in HashMap ? : true
  2. 1 One
  3. 2 Two
  4. 3 Three
  5. 4 Four
  6. 5 Five
  7. 6 Six

check particular value exits in hashmap

Instance Of Java

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