Core java

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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.

If you want to practice data structure and algorithm programs, you can go through 100+ java coding interview questions. Fibonacci series is numerical series in which next number is sum of previous two numbers. For example : 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 etc. There are two ways to print Fibonacci […]

In this post, we will see how to remove duplicate elements from ArrayList in java. There are many ways to do it. Some of them are: Using iterative approach Using HashSet (but does not maintain insertion order) Using LinkedHashMap Program: [crayon-6a2a1d634f748872742697/] When you run above program, you will get following output: [crayon-6a2a1d634f751788083974/] Please go through java […]