Introduction to Java
- 1. Java/J2EE Programming Training Introduction to Java
- 2. Page 2Classification: Restricted Agenda • Java History • Features of Java • Java Versions • Application Area
- 3. Page 3Classification: Restricted Features Of Java • Simple • Object-Oriented • Platform independent • Secured • Robust • Architecture neutral • Portable • Dynamic • Interpreted • High Performance • Multithreaded • Distributed
- 4. Page 4Classification: Restricted History of Java • James Gosling, Mike Sheridan, and Patrick Naughton initiated the Java language project in June 1991. The small team of sun engineers called Green Team. • Originally designed for small, embedded systems in electronic appliances like set-top boxes. • Firstly, it was called "Greentalk" by James Gosling and file extension was .gt. • After that, it was called Oak and was developed as a part of the Green project. • Originally developed by James Gosling at Sun Microsystems (which is now a subsidiary of Oracle Corporation)
- 5. Page 5Classification: Restricted James Gosling
- 6. Page 6Classification: Restricted Features Of Java • Simple • Similar to C and C++ • Omits operator overloading, multiple inheritance • Goto statement is eliminated • Header files are eliminated • Explicit use of pointers • Garbage collection • A rich set of predefined classes
- 7. Page 7Classification: Restricted Features Of Java • Object-Oriented • Forces the programmer to use the classes and object • Class • Member variables( data ) and member functions ( methods )
- 8. Page 8Classification: Restricted Features Of Java • Robust • designed for writing highly reliable or robust software: • automatic garbage collection, which prevents memory leaks • Type safety of data • Extensive compile tome and runtime checking • Object Oriented Exception Handling of run time errors • Divide by zero exception.
- 9. Page 9Classification: Restricted Features Of Java • Architectural Neutral and Interpreted • compiler generates bytecodes • Easy to interpret on any machine • “Write once and run anywhere WORA”
- 10. Page 10Classification: Restricted Features Of Java • Powerful • Networking • Threads • Distributed Objects • Database Access • Graphics • Data structure library • Serialization • Digital Signatures
- 11. Page 11Classification: Restricted Features Of Java • Java is Popular
- 12. Page 12Classification: Restricted Features Of Java • Distributed • Supports TCP/IP • RMI • Access remote objects via URL
- 14. Page 14Classification: Restricted Features of Java • MultiThreaded • Parallel processing Eg: Winword application saving document every 10 minutes using thread
- 15. Page 15Classification: Restricted Major Java Editions • Standard Edition • Enterprise Edition • Micro Edition
- 16. Page 16Classification: Restricted Major Java Editions • Standard Edition • Applications • Desktop programing • Applets, Java FX • Big Data Apps • Examples • MindCraft • Eclipse, Netbeans • GWT
- 17. Page 17Classification: Restricted Features Of Java • Enterprise Edition • Java EE ( formerly J2EE ) • Applications • Servlets, JSP, JSF, PrimeFaces • EJB, Spring and Hibernate • Examples • Amazon.com • Ebay • Paypal
- 18. Page 18Classification: Restricted Features Of Java • Java Micro Edition • Java running on small devices • Applications • CellPhones,embedded, printers • Examples • Blackberry, android( optimized java SE )
- 19. Page 20Classification: Restricted Java SE Versions Year Version Platform CodeName Features 1996 1 1.0 1997 1.1 1 1998 1.2 2 Playground Swings, Frameworks 2000 1.3 2 Kestrel Assertion, chained exceptions 2002 1.4 2 Merlin 2004 1.5 5 Tiger Generics, Varargs, Printf, Enhanced for loop 2006 1.6 6 Mustang Updates to collection and swing 2011 1.7 7 Dolphin Diamond operator, Strings in swich Try-with resources 2014 1.8 8 - Lambda for functional programing, Streams for bulk updates
- 20. Page 21Classification: Restricted JDK8 • Java development kit • Bundle of software components that are needed to develop java application • JDK consists • Java Compiler ( javac ) • Java Interpreter (java) • Java debugger • Java applet viewer • Javap
- 21. Page 22Classification: Restricted JVM • The JVM is an abstract computing machine • It is responsible for Java's cross-platform portability
- 22. Page 23Classification: Restricted JRE • The JRE is the software environment in which programs compiled for a typical JVM implementation can execute • Implementation of the JVM • Code necessary to run Java programs • dynamically link native methods • manage memory • handle exceptions
- 24. Page 25Classification: Restricted JIT ( Just In Time Compiler)
- 25. Page 26Classification: Restricted Object Oriented Programing • Object Oriented methodology • Advantages of object oriented approach • Features of Object Oriented approach
- 26. Page 27Classification: Restricted Object Oriented Programing • Software development methodology • Maps to real world objects • Graphics Car Real Cal • Revolves around objects and classes • Object can communicate with each other • Software is divided into modules • Arranges the object in hierarchy.
- 27. Page 28Classification: Restricted Object Oriented Programing • Consists of classes and object. • Object communicates with each other by passing messages What is an object????
- 28. Page 29Classification: Restricted Object Oriented Programing • Object is an instance of class • Object is an real time entity • State • Behavior • Identity NotePad Code{ filename Text: readOnly Open() Close() Minimize() Maxmize Save() } Object = Instance Of Notepad
- 29. Page 30Classification: Restricted Object States An Object has state and behavior
- 30. Page 31Classification: Restricted Objects • Objects have state and behavior • State: What an object knows about itself • Behavior :What an object can do. Object Name State = charecterstics Behaviour: Dog State: Name Breed Height Weight Behaviour: eat() run() walk()
- 31. Page 32Classification: Restricted Classes • Collection of objects wheelsSeats Car Music GearsA.C Engine
- 32. Page 33Classification: Restricted Class • Class consists of • Member variables and member methods. • State/ characteristics is represented via member variables • Member methods defines the responsibility of the class • Data within object represents its state. • Messaging Application • State-> Member Variables • To: • Text: • Behaviour – Member functions • sendSms • Forward • delete
- 33. Page 34Classification: Restricted Class • Class is blue print • Logical structure • Set of instructions given to JVM , how to create instance ( object ) out of it.
- 34. Page 35Classification: Restricted Messages To Text sendSms Forward cancel Messages1: Tom To : 123-456-7896 Text : Hi Tom, sendSms Forward cancel Messages2: Jack To : 478-963-7896 Text : Hi Jack sendSms Save Delete Class Object Tom Object Jack
- 35. Page 36Classification: Restricted Classes and Objects • Object communicates with each other by sending messages. • Bat Communicates with ball.
- 36. Page 37Classification: Restricted Quiz • John is designing a contact management system . Application should store the details of a person such as ( name, number, email ) . User should be able to add a contact ,update a contact and delete a contact. Name of the class: Data to be recored. Functionality of contact management system.
- 37. Page 38Classification: Restricted Contacts Name: Number email createContact updateContact deleteContact Contacts1: Tom Name: Tom Number : 456-789-7895 Email :tom@gmail.com createContact updateContact deleteContact Contacts2: Jack Name: Jack Number 789-896-8965 Email: jack@gmail.com createContact updateContact deleteContact
- 38. Page 39Classification: Restricted Quiz Identify the possible states of a computer Hint: A) Sleep Identify the possible state of a media player
- 39. Page 40Classification: Restricted Question John, is developing a Calculator application. The application should accept two numbers from the user and perform addition, subtraction, multiplication and division on the numbers entered by the user. Help John to design the problem.
- 40. Page 41Classification: Restricted Advantages Of Object Oriented Approach • Realistic Modelling
- 41. Page 42Classification: Restricted Advantages Of Object Oriented Programing • Realistic Modelling Bike String color; String model; Integer speed; Accelerate() Decelerate() Break()
- 42. Page 43Classification: Restricted Advantages Of Object Oriented Approach •Code Reusability Contacts1: Tom Name: Tom Number : 456-789- 7895 Email :tom@gmail.com createContact updateContact deleteContact
- 43. Page 44Classification: Restricted Features Of Object Oriented Programing • Flexibility to change: WordAppV1 WordAppV2
- 44. Page 45Classification: Restricted Features Of Object Oriented •Modularity
- 45. Page 46Classification: Restricted Features • Information Hiding • The basic idea is that if code chunk A doesn't really need to know something about how code chunk B (which it calls) does its job, don't make it know it. Then, when that part of B changes, you don't have to go back and change A