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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 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.

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 "

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.

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.

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.

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.

Most of the activities we perform on day-to-day basis have lots of little steps. For e.g., an activity like send greeting card will contain small steps like go to the greeting card shop, choose it, pay for it, write the names and address, go to the post office, buy stamps, affix the stamps and drop the card in the post drop box. In this some steps like going to the post office, buying stamps and dropping the card in the post box are time-consuming and repetitive. Where as calculating the price of all the cards we bought, paying the money to the shop-keeper and counting the change returned is error prone. These kind of steps which does not need lot of human intervention and are not person dependent can be automated using Computer Programs. Please note that no matter how many steps we automate, there will be things like choosing the right card which needs the human intervention and the personal touch. The computer programs help in automating the tasks which are time consuming, error prone, repetitive, not person dependent etc., They also help in stream lining the processes, provide better experience to the end users, keeping track of historical data, analyze the data etc., Some programs are very expensive and could take 5 or more years with multiple teams working on it, while some might be relatively easy and can be built in matter of weeks by an individual developer.

Front End Development or Client-Side Development is the practice of coding in technologies like HTML, CSS, and Javascript in a website. The practice involves converting Data into a Graphical Interface for a user to view and interact. Growth in Front-end development is excellent and there are plenteous opportunities available, especially because companies now want their customers to have a good experience while using their Web applications. Want to get hired as a Front End Developer in 2019? Acquire skills in Front End Development, Build live Projects and Get Guaranteed Interviews with edWisor.

Android Tutorial. Android is a software package containing linux based operating system for mobile devices such as tablet computers, smartphones etc, middleware and key mobile applicaitons.

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.

Learning a computer language is very easy compared to writing good programs and using the language effectively. For a beginner, it might take 4-5 months to learn a new language where as perfecting the programming skills including the design, debugging and maintenance might take more than 3 to 4 years. Listed below are few of skills which everyone needs for becoming a good programmer.