Introduction to JAVA
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Java is a general-purpose, object-oriented computer programming language that offers special features that allow programs to take advantage of the power and flexibility of the Internet.
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Introduction to JAVA
- 1. Introduction to JAVA Java J2EE Training
- 2. Introduction to Java • Java History • Features of Java • Java Versions • Application Area
- 3. Features Of Java • S imp le • O b jec t -O riented • Platform in d ep en d ent • S ec u red • Rob u st • A rc h itec tu re neutral • Portab le • Dy n amic • Interp reted • High Performance • Mu ltith read ed • Distrib u ted
- 4. 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)
- 6. 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. Features Of Java • Object-Oriented – Forces the programmer to use the classes and object – Class • Member variables( data ) and member functions ( methods )
- 8. 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. Features Of Java • Architectural Neutral and Interpreted – compiler generates bytecodes – Easy to interpret on any machine – “Write once and run anywhere WORA”
- 10. Features Of Java • Powerful – Networking – Threads – Distributed Objects – Database Access – Graphics – Data structure library – Serialization – Digital Signatures
- 11. Features Of Java • Java is Popular
- 12. Features Of Java • Distributed – Supports TCP/IP – RMI – Access remote objects via URL
- 13. RMI
- 14. Features of Java • MultiThreaded – Parallel processing Eg: Winword application saving document every 10 minutes using thread
- 15. Major Java Editions • Standard Edition • Enterprise Edition • Micro Edition
- 16. Major Java Editions • Standard Edition • Applications – Desktop programing – Applets, Java FX – Big Data Apps • Examples – MindCraft – Eclipse, Netbeans – GWT
- 17. Features Of Java • Enterprise Edition – Java EE ( formerly J2EE ) • Applications – Servlets, JSP, JSF, PrimeFaces – EJB, Spring and Hibernate • Examples – Amazon.com – Ebay – Paypal
- 18. Features Of Java • Java Micro Edition – Java running on small devices • Applications – CellPhones,embedded, printers • Examples – Blackberry, android( optimized java SE )
- 19. 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. 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. JVM • The JVM is an abstract computing machine • It is responsible for Java's cross-platform portability
- 22. 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
- 23. JIT
- 24. JIT ( Just In Time Compiler)
- 25. Object Oriented Programing • Object Oriented methodology • Advantages of object oriented approach • Features of Object Oriented approach
- 26. 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. Object Oriented Programing • Consists of classes and object. • Object communicates with each other by passing messages What is an object????
- 28. 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. Object States An Object has state and behavior
- 30. 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. Classes • Collection of objects wheelsSeats Car Music GearsA.C Engine
- 32. 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. Class • Class is blue print – Logical structure – Set of instructions given to JVM , how to create instance ( object ) out of it.
- 34. 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. Classes and Objects • Object communicates with each other by sending messages. – Bat Communicates with ball.
- 36. 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. 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. Quiz Identify the possible states of a computer Hint: A) Sleep Identify the possible state of a media player
- 39. 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. Advantages Of Object Oriented Approach • Realistic Modelling
- 41. Advantages Of Object Oriented Programing • Realistic Modelling Bike String color; String model; Integer speed; Accelerate() Decelerate() Break()
- 42. Advantages Of Object Oriented Approach • Code Reusability Contacts1: Tom Name: Tom Number : 456-789- 7895 Email :tom@gmail.com createContact updateContact deleteContact
- 43. Features Of Object Oriented Programing • Flexibility to change: WordAppV1 WordAppV2
- 44. Features Of Object Oriented • Modularity
- 45. 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