Javarevisited

Though both Iterator and Enumeration allows you to traverse over elements of Collections in Java, there is some significant difference bet...

The ConcurrentHashMap class part of concurrent collections package added on JDK 1.5 which contains utility classes like  BlockingQueue , C...

Hello guys, if you are looking for an answer of popular Java interview question, how HashMap works in Java? or How HashMap works internally ...

The difference between fail-safe and fail-fast Iterator is becoming favorite core java interview questions day by day, the reason it  tou...

What is the difference between List and Set in Java is a very popular Java collection interview question and an important fundamental ...

ArrayList and Vector are two of the most used classes on the java collection package and the difference between Vector and ArrayList is o...

HashMap vs Hashtable in Java Though both Hashtable and HashMap are data-structure based upon hashing and implementation of Map interface,...

LinkedList and ArrayList both implement List Interface but how they work internally is where the differences lie. The main  difference be...

TreeSet , LinkedHashSet, and HashSet all are implementation of the  Set interface and by virtue of that, they follow the contract of Se...

The PriorityQueue and TreeSet collection classes have a lot of similarities e.g. both provide O(log(N)) time complexity for adding, remo...

Synchronized vs Concurrent Collections Though both Synchronized and Concurrent Collection classes provide thread-safety, the differences b...

The Java collection framework offers implementation of different data structure like an array, list, set, map, queue, tree, etc and the...

Hello guys, if you are wondering what is difference between HashMap, TreeMap, and LinkedHashMap in Java and when to use them then you are at...

It's not easy to get key from the value in Hashtable or HashMap, as compared to getting value from key because HashMap or Hashtable d...

Hello guys, if you are wondering what is differnece between an HashMap and IdentiyHashMap in Java then you are at right place. IdentityHas...

One of my readers asked me about the difference between ArrayList vs ArrayList< in Java ? > , which was actually asked to him in a ...

Java 8 provides excellent features to support the filtering of elements in Java Collections. Prior to Java 8, the only better way to filter...

Interview questions from the Collection package or framework are most common in any Core Java Interview yet a tricky one. Together Collec...

How to convert Collection to String in Java Many times we need to convert any Collection like Set or List into String like comma-sep...

Prior to Java 8, HashMap and all other hash table based Map implementation classes in Java handle collision by chaining , i.e. they use lin...