Example. By Sonu Kumar Ray Page 1 Q:Difference between HashMap and HashTable? 3466. 21) Difference between Vector and ArrayList? 41. What are the differences between HashMap and Hashtable? 36) What is the difference between HashMap & LinkedHashMap? 46. 42. Iterator in hashmap and hashtable is fail fast but enumerator in hashtable isfail safe. 47. We use put() method to insert the Key and Value pair in the HashMap. A: The HashMap class is roughly equivalent to Hashtable, except that it is unsynchronized and permits nulls. 3647. What is Entry interface? 40. Explain about LinkedHashMap? The third significant difference between HashMap vs Hashtable is that Iterator in the HashMap is a fail-fast iterator while the enumerator for the Hashtable is not. But, the methods of ArrayList is not synchronized. 43. 40. 43. ... durga sir ameerpet Harikrishna Sir Ameerpet JAVA IN HINDI Java Introduction Object oriented Programming In Hindi Popular Posts Identifiers Of Java In HINDI Language - NIMAJAVA. The default size of HashMap is 16 (0 to 15). Hashmap is traversed using an iterator, hashtable can be traversed by enumerator or iterator. How do I read / convert an InputStream into a String in Java? 4241. 42. 38) What is the difference between TreeSet andTtreeMap? 654. What are the differences between HashMap and LinkedHashMap? What are the differences between HashMap and Hashtable? What is Entry interface? Explain about LinkedHashMap? 225) Difference between Comparator and Comparable in java? Comparable and Comparator both are interfaces and can be used to sort collection elements. 34) What is the purpose of Map interface? Lets note down the differences: All the methods of Vector is synchronized. 35) What do you mean by entry. What are the differences between a HashMap and a Hashtable in Java? In the following example, we want to insert three (Key, Value) pair in the HashMap. 223) Difference between HashMap and Hashtable? What are the differences between HashMap and LinkedHashMap? Difference between HashMap and Hashtable is one of the most popular java interview questions. 47. We have already discussed other popular java interview questions like ArrayList vs Vector and Comparator vs Comparable.This question is generally asked in java intereview to check whether candidate understand correct usage of collection classes and has knowledge of alternative solutions. 45. 44. . What are differences between Comparable and Comparator? HashMap permits null values and only one null key, while Hashtable doesn't allow key or value as null. Insert Key, Value pair in HashMap. How do I generate random integers within a specific range in Java? What are differences between Comparable and Comparator? 39) What is the difference between HashTable and Properties file key=value pairs? However, there are many differences between Comparable and Comparator interfaces that are given below. 46. What is difference between HashSet and TreeSet? What is difference between HashSet and TreeSet? (HashMap allows null values as key and value whereas Hashtable doesnt allow). Several new Collection classes are added in Java 5 and Java 6 specially concurrent alternatives of standard synchronized ArrayList, HashTable and synchronized HashMap … 41. Explain about HashMap? 44. How do I efficiently iterate over each entry in a Java Map? 37) What is the difference between comparable vs Comparator interface? Difference between Comparable and Comparator. 45. 224) Difference between arraylist and linkedlist? Explain about HashMap?