Advanced OOP MCS-3 OOP BSCS-3 Lecture # 1

Compulsory Reading Material Java; How to Program (9th Edition) by Paul Deitel & Harvey Deitel

Characteristics Of Java Java Is Simple Java Is Object-Oriented Java Is Distributed Java Is Interpreted Java Is Robust Java Is Secure Java Is Architecture-Neutral Java is Portable / Platform Independent Java's Performance Java Is Multithreaded Java Is Dynamic

JDK Versions JDK 1.02 (1995) JDK 1.1 (1996) JDK 1.2 (1998) A Java Development Kit (JDK) is a program development environment for writing Java applets and applications. JDK 1.02 (1995) JDK 1.1 (1996) JDK 1.2 (1998) JDK 1.3 (2000) JDK 1.4 (2002) JDK 1.5 (2004) a. k. a. JDK 5 or Java 5 JDK 1.6 (2006) a. k. a. JDK 6 or Java 6 JDK 1.7 (possibly 2010) a. k. a. JDK 7 or Java 7

JDK Editions Java Standard Edition (J2SE) J2SE can be used to develop client-side standalone applications or applets. Java Enterprise Edition (J2EE) J2EE can be used to develop server-side applications such as Java servlets and Java ServerPages. Java Micro Edition (J2ME). J2ME can be used to develop applications for mobile devices such as cell phones.

Which Java? Java 6+ JDK (Java Development Kit), Standard Edition includes: JDK (Java development kit) – for developing Java software (creating Java programs. JRE (Java Runtime environment) – only good for running pre-created Java programs. Java Plug-in – a special version of the JRE designed to run through web browsers. A plug-in is a software component that adds a specific feature to an existing software application. Most latest JDK and its documentation can be downloaded from: http://www.oracle.com/technetwork/java/javase/downloads/index.html

Popular Java IDEs NetBeans; Open Source by Sun Eclipse; Open Source by IBM Borland Jbuilder BlueJ Jcreator IntelliJ IDEA Dr. Java

Java Vs. Java Script Java is an OOP programming language while Java Script is an OOP scripting language. Java creates applications that run in a virtual machine or browser while JavaScript code is run on a browser only. A Java virtual machine (JVM) is a virtual machine that can execute Java bytecode. It is the code execution component of the Java platform. In a sense, JVM is both an interpreter and a compiler, but not purely. Java code needs to be compiled while JavaScript code are all in text. They require different plug-ins.

A High Level View Of Translating/Executing Java Programs Traditional Compiled Program Java Program The Java development environment has two parts: a Java compiler and a Java interpreter. The Java compiler takes your Java program and instead of generating machine codes from your source files, it generates bytecodes. To run a Java program, you run a program called a bytecode interpreter, which in turn executes your Java program

A High Level View Of Translating/Executing Java Programs Stage 1: Compilation Java program Filename.java Java compiler (javac) Java bytecode (generic binary) Filename.class Bytecodes are a set of instructions that looks a lot like some machine codes, but that is not specific to any one processor.

A High Level View Of Translating/Executing Java Programs Stage 2: Interpreting and executing the byte code Machine language instruction (UNIX) Machine language instruction (Windows) Machine language instruction (Apple) Java bytecode (generic binary) Filename.class Java interpreter (java)

Assignment # 1 Find out the Difference b/w Java & other programming languages. What is the connection between ORACLE and Java?

Good Luck ! ☻