JAVA PROGRAMMING

Java Programming Terminology:

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Java is the name of a programming language created in 1995. It is very popular among software companies and universities. It is also the name of the application used to execute Java applications.

JDK is an acronym for Java Development Kit. It is used to compile and execute Java programs. The book requires version 5 or above.

JRE is an acronym for Java Runtime Environment. It is used to execute Java programs. The book requires version 5 or above.

IDE is an acronym for Integrated Development Environment. It is a tool helping a programmer creating software programs. A Java IDE helps a programmer create Java programs.  Programmers are often very passionate about their Java IDE because they spend many hours of their work life with it. There are many advanced tricks and features which makes life easier once you are familiar with them. Free Java IDEs include Eclipse, NetBeans and BlueJ.

JVM is an acronym for Java Virtual Machine. It is an application that knows how to execute Java class files. The Java class files can be used on any kind of computer however the computer needs the correct Java Virtual Machine to be able to execute it. This is why it is called 'virtual'. This application simulates a virtual machine that knows how to run Java class files . Windows, Linux and Mac computers have different Java Virtual Machines. The JRE includes a JVM named java or javaw.

Compiler is an application that converts text files created by a programmer into binary files the computer understands. A Java compiler converts a Java text file into a class file. The JDK includes a Java compiler application named javac that produces class files. The Java Virtual Machine knows how to execute class files.
Editor is an application used to edit text files. For Windows users, Notepad is the simplest editor and can be used to edit simple Java programs. Developers prefer using specific Java editors that color Java instructions such as 'for' 'if' 'else' making it easier to work with Java files. Java editors can even provide suggestions to complete what you are currently typing - this feature is called 'code assist'. Java IDE's provide powerful Java editors that also show the location of syntax errors.

Command line is an application used to type in commands to a computer. It is often used by developers to execute applications. If you don't use a Java IDE you can compile Java programs and execute them directly through the command line. You do so by calling the applications javac and java from the JDK and JRE and passing the name of the Java programs to compile or execute.