Core java

In this post, we will see difference between Iterator and ListIterator in java. They are both used for traversal but it is good to point out differences between them. Iterator vs ListIterator: Parameter Iterator ListIterator Traversal Iterator can be used to traverse List,set, Queue ListIterator can be used to traverse only List. Traversal direction Iterator can […]

In this post, we will see TreeSet in java. Java TreeSet have following properties: It can contain only unique element. It stores objects in ascending order by default, It implements NavigableSet interface which extends SortedSet. When you put objects in TreeSet, it must implement Comparable interface. Lets understand it more with the help of example. […]

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Java Enum is special data type which represents list of constants values. It is a special type of java class.  It can contain constant, methods and constructors  etc. Lets see example to understand better Let’s say we get three types of issues which require different SLA to get it fixed. Usually they are level 1,level […]

I have been posting java interview programs on various topics such as Binary tree, LinkedList , String, Number, ArrayList, HashMap etc. So I am consolidating list of java interview programs to create an index post. I will keep adding links to this post whenever I add any new program. These are frequently asked java programs […]

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Timer is an utility class which can be used to schedule tasks on specific time or repeatedly. Lets say, you are developing an banking application and there is need to process the data at 7 PM evening daily. You can easily schedule task using Timer class. For creating a task, you need to extends TimerTask […]

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As per java docs, CountDownLatch is synchronisation aid that allows one or more threads to wait until set of operations being performed in other threads completes.