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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.

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.

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.

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.