Getting Started With JavaSeptember 22, 2010

Java Bytecode Bytecode: is a highly optimized set of

instructions designed to be executed by the Java run-time system (JVM)

(The JVM is an interpreter for bytecode)

MAC Interpreter Compaq Interpreter HP Interpreter

Java BytecodeCompiler

Platform Independence A programming language is considered

platform independent or portable if the source code created on one computer platform can execute on another without any difficulty.

Compiled and Interpreted Java uses a compiler to translate the

source code by the programmer into bytecode

Java then continues and uses an interpreter to translate the bytecode into executable machine code.

Applications and Applets A Java program designed to operate

inside a webpage is called an applet A Java program designed to operate in a

stand-alone environment is called an application

Our first Data Types String – stores sequences of

characters. Int – an integer (only whole numbers) Double- allows for fractional

components of numbers (most common) Float- also allows for fractional

components of numbers

Logical Operators & -- AND |-- OR ^ --XOR (exclusive or) || -- short-circuit OR && -- short-circuit AND ! -- NOT