By Nancy 2015 | By Nancy | CONFIDENTIAL Objective          Java - What, Where and Why? History and Features of Java Internals of Java Program Difference between JDK, JRE and JVM Internal Details of JVM Variable and Data Type Naming Convention Access Modifiers Static keyword - variables 2015 | By Nancy | CONFIDENTIAL History         Java is a High Level Programming Language. Developed by Sun Microsystems in 1991. Original name of java is OAK. OAK was designed for handheld devices and set top boxes. Sun changed the name to JAVA. In 2009 , Oracle acquire Sun Microsystems. Now the owner of java is ORACLE. Java is object oriented programming language. 2015 | By Nancy | CONFIDENTIAL Features of Java The Java Features given below are simple and easy to understand…        Simple Object-Oriented Platform independent Secured Portable High Performance Multithreaded 2015 | By Nancy | CONFIDENTIAL More information   There are more than 9 million java developers worldwide. 3 billion mobile phones run JAVA. 2015 | By Nancy | CONFIDENTIAL Basic terminology  SOURCE CODE : files with ‘.java’ extension.  BYTE CODE : files with ‘.class’ extension.  COMPILER: which convert source code into byte code.  INTERPRETER: who executes the compiled java code directly .line by line. slow.  JIT COMPILER : Just-In-Time compiler covert the byte code into machine code.JIT do ...
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