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Java features
- 1. Basics and Features of Java 1
- 2. Objectives On completion of this period, you would be able to know • The features of Java Applets and Applications 2
- 3. Recap • What is an applet? • Differentiate Java with C++ • Why Java is important to internet? 3
- 4. Features of Java applications Sun Micro Systems officially describes Java with the following features • Compiled and Interpreted • Platform Independent and Portable • Object Oriented • Robust and Secure • Distributed 4
- 5. Contd.. Features of Java applications • Simple, Small and Familiar • Multithreaded and Interactive • High Performance • Dynamic and Extensible 5
- 6. Compiled and Interpreted • Usually a computer language is either compiled or interpreted • Java combines both these approaches, thus making Java a two stage system • First Java compiler translates source code into byte code instructions • Byte codes are not machine instructions 6
- 7. Contd.. Compiled and Interpreted • In the second stage Java interpreter generates machine code • That can be directly executed by the machine Fig. 2.1 Compiled and Interpreted 7
- 8. Platform Independent and Portable • The most significant feature of Java is its portability • Java programs can be easily moved from one computer system to another ,anywhere and at anytime 8
- 9. Platform Independent and Portable Contd.. • Changes and upgrades in • Operating systems • Processors • System resources will not force any changes in Java programs 9
- 10. Platform Independent and Portable Contd.. Fig. 2.2 Once compiled, Java class file can be run on any platform 10
- 11. Object Oriented • Java is a true object oriented language • Almost everything in Java is an object • All programs code and data reside within objects and classes • Java comes with an extensive set of classes arranged in packages 11
- 12. Robust and Secure • Java is a robust language • It provides many safeguards to ensure reliable code • It has strict compile time and runtime for data types 12
- 13. Contd.. Robust and Secure • It is designed as a garbage collected language • Java also provides concept of exception handling which identifies errors and eliminates 13
- 14. Contd.. Robust and Secure • Security becomes an important issue for a language that is used for programming on internet • Threat of viruses and abuse of resources • Java systems not only verify all memory access, but also ensure that no viruses are communicated with an applet 14
- 15. Contd.. Robust and Secure • The absence of pointers in Java ensures that programs cannot gain access to memory location without proper initialization 15
- 16. Distributed • Java is designed as a distributed language for creating applications on networks • It has the ability to share both data and programs 16
- 17. Contd.. Distributed • Java applications can open and access remote object as easily as they can do in a local system • Enables multiple programmers at multiple locations work together on a single project 17
- 18. Simple, Small and Familiar • Java is small and simple language. Many features of C and C++ are not part of Java eg. : Java does not provide • Pointers • Preprocessors header file • goto statements • Operator overloading • Multiple inheritance 18
- 19. Contd.. Simple, Small and Familiar • Familiarity is another feature of Java • It is modeled on C and C++ languages • Java is a simplified version of C++ 19
- 20. Multithreaded and Interactive • Multithreaded means handling multiple tasks simultaneously • Java supports multithreaded programs • Need not wait for the application to finish one task before beginning another • Greatly improves the interactive performance of graphical applications 20
- 21. High Performance • Java performance is impressive for an interpreted language • Due to the use of intermediate byte code • Java architecture is also designed to reduce overheads during runtime • The incorporation of multithreading enhances the overall execution speed of Java programs 21
- 22. Dynamic and Extensible • Java is a dynamic language • Java is capable of dynamically linking new • Class libraries • Methods • Objects • Java programs supports functions written in other languages such as C and C++ • These functions are known as “native methods” 22
- 23. Contd.. Dynamic and Extensible • This facility enables the programmers to use the efficient available in these languages • Native methods are dynamically linked at runtime 23
- 24. Summary • Features of Java Applications • Features of Java Applets 24
- 25. Quiz 1.Usually a computer language is either ______ a) Compiled b) Compiled and Interpreted c) Compiled or Interpreted d) Interpreted 25
- 26. Frequently Asked Questions • Explain the features of Java Applications and Java Applets 26
- 27. swings Struts jdbc hibernate home java previous question papers OCT/NOV-2012 QUESTION PAPER April / May 2012 c-09 October/ November-2011 c-09 April/ May 2011 c-09 April/ May 2011 c-05 27