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Java program to remove key value from hashmap

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instanceof java

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Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Java program to remove key value from hashmap Posted: Mar 14, 2016 4:22 PM
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Original Post: Java program to remove key value from hashmap
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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()){

  44. Map.Entry obj=(Entry) it.next();
  45. System.out.print(obj.getKey()+" ");
  46. System.out.println(obj.getValue());
  47.              
  48. }           
  49. }   
  50.  
  51. }
  52.  
  53. }
     



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

Read: Java program to remove key value from hashmap


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