All the Java ADF beginners need to know - part1
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This document provides an overview of Java for beginners, covering its characteristics, history, and various editions, as well as the basics of development environments and writing a first program. Key features of Java include platform independence, strong security, automatic memory management, and support for networking. It also outlines the evolution of Java versions and their significant milestones.
All the Java ADF beginners need to know - part1
- 1. All the Java ADF Beginners need to know! – Part 1 Markus Eisele Oracle ACE Director Msg systems ag, Germany 1 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 2. http://blog.eisele.net http://twitter.com/myfear markus@eisele.net
- 3. Overview 1. Introduction 2. History 3. Java„s Characteristics 4. Java Editions 5. Development Environments 6. Your First Program 7. The Language Basics 3 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 4. Introduction The term Java actual refers to more than just a particular language like C or Pascal. Java encompasses several parts, including : • A high level language The Java language is a high level one that at a glance looks very similar to C and C++ but offers many unique features of its own. • Java bytecode A compiler, such as Sun's javac, transforms the Java language source code to bytecode that runs in the JVM. • Java Virtual Machine (JVM) A program, such as Sun's java, that runs on a given platform and takes the bytecode programs as input and interprets them just as if it were a physical processor executing machine code. 4 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 5. Introduction There were five primary goals in the creation of the Java language. It should: • be "simple, object oriented, and familiar". • be "robust and secure". • have "an architecture-neutral and portable environment". • execute with "high performance". • be "interpreted, threaded, and dynamic". 5 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 6. History Year Milestone JDK 1.1 (released on Feb 19,1997) Major additions included an extensive retooling of the AWT event model, inner classes added to the language, JavaBeans and JDBC. J2SE 1.2 (Dec 8, 1998) Reflection, a Collections framework, Java IDL (an Codename Playground. IDL implementation for CORBA interoperability), Swing graphical API, a Java Plug-in, JIT compiler. Bundling of the HotSpot JVM (the HotSpot JVM was J2SE 1.3 (May 8, 2000) first released in April, 1999 for the J2SE 1.2 JVM), Codename Kestrel. JavaSound, JNDI and JPDA. J2SE 1.4 (Feb 6, 2002) Developed under the Java Community Process as Codename Merlin. JSR 59. Regular expressions modeled after Perl, exception chaining, an integrated XML parser and XSLT processor (JAXP), and Java Web Start. J2SE 5.0 or 1.5 (Sep 30, 2004) Developed as JSR 176, New language features Codename Tiger. including the for-each loop, generics, autoboxing and var-args. Java SE 6 (Dec 11, 2006) Database manager, Use of scripting languages with Codename Mustang the JVM, Visual Basic language support. Support for pluggable annotations (JSR 269), GUI improvements, including native UI enhancements, improvements to the JPDA & JVM Tool Interface Java SE 7 — Codename Dolphin. The Dolphin Project started in August 2006, with first release estimated in September 2010. 6 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 7. Java‘s Characteristics • Platform Independence The Write-Once-Run-Anywhere ideal • Object Oriented Object oriented throughout - no coding outside of class definitions, including main(). • Compiler/Interpreter Combo Code is compiled to bytecodes that are interpreted by a Java virtual machines (JVM) . • Robust Exception handling built-in, strong type checking (that is, all data must be declared an explicit type), local variables must be initialized. • Several dangerous features of C & C++ eliminated: No memory pointers , No preprocessor , Array index limit checking • Automatic Memory Management Automatic garbage collection - memory management handled by JVM. • Security No memory pointers, Programs runs inside the virtual machine sandbox, Array index limit checking • Dynamic Binding ´The linking of data and methods to where they are located, is done at run-time. New classes can be loaded while a program is running. Linking is done on the fly. Even if libraries are recompiled, there is no need to recompile code that uses classes in those libraries. • Good Performance Interpretation of bytecodes slowed performance in early versions, but advanced virtual machines with adaptive and just-in-time compilation and other techniques now typically provide performance up to 50% to 100% the speed of C++ programs. • Threading Lightweight processes, called threads, can easily be spun off to perform multiprocessing. Can take advantage of multiprocessors where available Great for multimedia displays. • Built-in Networking Java was designed with networking in mind and comes with many classes to develop sophisticated Internet communications. 7 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 8. Java Editions Optional Packages Optional Packages Optional Optional Java Packages Packages Platform Java Enterprise MIDP Personal Profile Platform Edition Standard CLDC CDC (Java EE) Edition (Java SE) Java Platform Micro Edition (Java ME) 8 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 9. Java Editions Source: http://en.wikipedia.org/wiki/Java_(software_platform) 9 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 10. Development Environments 10 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 11. Your First Program 11 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 12. The Language Basics 12 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 13. Lesson in a tweet “The best thing about a boolean is even if you are wrong, you are only off by a bit.” (Anonymous) http://www.devtopics.com/101-great-computer-programming-quotes/ 13 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 14. Thanks! http://www.sagecomputing.com.au/ 14 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 15. Free eBooks http://java.sun.com/docs/books/jls/ http://www.mindviewinc.com/Books/downloads.html http://download.oracle.com/javase/tutorial/ http://math.hws.edu/javanotes/ 15 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11
- 16. Thank you for your attention Markus Eisele Principle IT Architect http://blog.eisele.net http://twitter.com/myfear www.msg-systems.com www.msg-systems.com 16 Markus Eisele, Oracle ACE Director FMW & SOA msg systems ag, 26/06/11