CSCI 212Object-Oriented Programming

in Java

Prerequisite: CSCI 111

variable assignment statementwhile loop for loop post-increment (i++) strong typing array block {} scopefunction parameter pre-increment (++i) recursion

Why Java?Write Once; Run Anywhere?

C++ Source Code

Executable Binary Code for Windows

hardware

C++ Compiler for Windows

C++ Compiler for iOS

Executable Binary Code for Apple hardware

Executable Binary Code for other hardware

C++ Compiler for other hardware

Write Once; Run Anywhere!

Java Source Code

Java “Bytecode”

Java Compiler for Windows

Java Compiler for iOS

Java “Bytecode” Java “Bytecode”

Java Compiler for other hardware

Java Virtual Machine“JVM”

Java Virtual Machine“JVM”

Java Virtual Machine“JVM”

The JDK and the JREAPI – Application Program Interface

Class libraries (MATH, GUI, Database…)

JRE – Java Runtime EnvironmentJVM plus API (can run Java programs)

JDK- Java Development KitJRE plus compiler, javadoc, …

For CSCI 212 you need the JDK

Java Source Code

Java “Bytecode”

Java Compiler for Windows

HelloWorld.java

>javac HelloWorld.java

HelloWorld.class

>java HelloWorld

JRE

Ada Source Code

Java “Bytecode”

Ada Compiler for Windows

Executable Binary Code for Windows

hardware

JRE

The Java Virtual Machine ensures a program will run the same way on any computer

My biggest integer is 999,999,999,999,999,999!

My biggest integer is 999,999,999!

When running on Native Hardware you are dependent on the machine's architecture

My biggest integer is 999,999,999,999,999,999!

My biggest integer is 999,999,999!

int salary = 999,999,999,999,999,999;

The JVM Levels the Playing Field

My biggest integer is 999,999,999,999,999,999!

My biggest integer is 999,999,999!

int salary = 999,999,999,999,999,999;

JVMThe biggest Java integer is 2,147,483,647

int salary = 1,999,999,999;