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How HashMap works in Java or sometime how get method work in HashMap is common interview questions now days. Almost everybody who worked in Java knows what hashMap is, where to use hashMap or difference between hashtable and HashMap then why this interview question becomes so special? Because of the breadth and depth this question offers. It has become very popular java interview question in almost any senior or mid-senior level java interviews. Questions start with simple statement "Have you used HashMap before" or "What is HashMap? Why do we use it "

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Java Topic / Java tutorial Java was conceived by James Gosling, Patrick Naughton, Chris Warth, Ed Frank and Mike Sheridan at Sun Microsystems, Inc in 1991. Initially it was called Oak, later it was changed to Java in 1995.

Java Topic / Java tutorial Java in order to support 73:security and 73:portability, does not compile the source code to executable code. It is translated into bytecode, which is highly optimized set of instructions designed to be executed by the Java run-time system, which is called Java Virtual Machine (JVM). JVM is an interpreter of bytecode.

Java Topic / Java tutorial As discussed in 161 programming helps automating lot of time consuming activities and reduces the human errors. Every computer program needs to be written in one of the multiple computer languages which are available. One such programming language is Java.

A good explanation of frequently asked java interview question Iterator vs Enumeration.Between two Enumeration is older and its there from jdk 1.0 while iterator was introduced later.The functionality of Enumeration interface is duplicated by the Iterator interface.

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Java Topic / Java tutorial Classes are supported by every object oriented programming language and they can be used to group related data. For _EG_ if we take student details, although we can store the information about the student using primitive data types like int, double and char, it will be useful to have a separate type for student.

Best article I have come acrsoo about wait()notify() and notifyAll() methods in java in internet. these method forms the inter-thread communication and correct understanding of these methods are must. wait() and notify)() method has to be called from synchronized method or block but why ?? This same questions was asked in a Java interview to me and I didn't know the correct answer ahh.

Java Topic / Java tutorial An important element of object oriented programming is abstraction. Abstraction is basically managing the complex activities with out knowing the details. For _EG_ when we call some one using the mobile, there are lot of operations which happen in the background, before the call reaches the other person. We need not know any of that information, but still be able to make a call.

Java Topic / Java tutorial An important element of object oriented programming is abstraction. Abstraction is basically managing the complex activities with out knowing the details. For _EG_ when we call some one using the mobile, there are lot of operations which happen in the background, before the call reaches the other person. We need not know any of that information, but still be able to make a call.

Java Topic / Java tutorial As discussed in 118, an abstract classes do not map to real life objects and they can not exist on their own, with out taking the form any of its concrete sub-classes. _EG_ Shape can not exist on it own, it has to be either Rectangle or Square or Circle.

Java Topic / Java tutorial We have seen the class hierarchies - Entertainments example in 101 and IceCreamPrices example in 111. The class hierarchies look similar except that there is minor difference between them. IceCream is a concrete super-class where as Entertainment is an abstract super-class. The difference is explained below.

Java is not only a programming language but a platform also. Let's learn where it is used and what application we can create through java.

Collections classes are heart of java API though I feel using them judiuously is an art.its my personal experience where I have improved performance by using ArrayList where legacy codes are unnecesarily used Vector etc.JDK 1.5 introduce some good concurrent collections which is highly efficient for high volume , low latency system.

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