» » » Java program to remove key value from hashmap

1.Basic java example program to remove value from hashmap.

  • using  Object remove(Object key) method we can remove key value pair of hashmap.


  1. package com.javaremovevaluehashmap;
  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.       String key=null;
  24.       String value="java programming basics Interview questions";   
  25. hashmap.put(key,value);
  26.  
  27. /*
  28. To remove a key value pair from HashMap use
  29. Object remove(Object key) method of HashMap class.
  30. It returns either the value mapped with the key or null if no value
  31. was mapped.    
  32.  */      
  33.  
  34.  Object object = hashmap.remove("4");
  35.         System.out.println(object + " Removed from HashMap");
  36.     
  37.  
  38. if(!hashmap.isEmpty()){
  39.  
  40. Iterator it=hashmap.entrySet().iterator();
  41.              
  42. while(it.hasNext()){

  43. Map.Entry obj=(Entry) it.next();
  44. System.out.print(obj.getKey()+" ");
  45. System.out.println(obj.getValue());
  46.              
  47. }           
  48. }   
  49.  
  50. }
  51.  
  52. }
     



Output:

  1. Four Removed from HashMap
  2. null java programming basics Interview questions
  3. 1 One
  4. 2 Two
  5. 3 Three
  6. 5 Five
  7. 6 Six

Instance Of Java

We will help you in learning.Please leave your comments and suggestions in comment section. if you any doubts please use search box provided right side. Search there for answers thank you.
«
Next
Newer Post
»
Previous
Older Post

No comments

Leave a Reply

Select Menu