Object Oriented Programming using Java..
- 1. OBJECT ORIENTED PROGRAMMING USING JAVA V SEMESTER – BSC(PMCS) DEPARTMENT OF COMPUTER SCIENCE GOVERNMENT FIRST GRADE COLLEGE, MALUR Dr. HAMELA K
- 2. SYLLABUS Unit - I Introduction to JAVA: JAVA Evolution: Java History, Java Features, How Java Differs from C and C++, Java and Internet, Java and World Wide Web, Web Browsers, Hardware and Software Requirements, Java Support Systems, Java Environment. Overview of JAVA Language: Introduction, Simple Java program, More of Java Statements, Implementing a Java Program, Java Virtual Machine, Command Line Arguments, Programming Style. Constants, Variables, and Data Types: Introduction, Constants, Variables, Data Types, Declaration of Variables, Giving Values to Variables, Scope of Variables, Symbolic Constants, Type Casting, Getting Values of Variables, Standard Default Values, Operators and Expressions: Introduction, Arithmetic Operators, Relational Operators Logical Operators, Assignment Operators, Increment and Decrement Operators, Conditional Operators, Bitwise Operators, Special Operators, Arithmetic Expressions, Evaluation of Expressions, Procedence of Arithmetic Operators, Type Conversion and Associativity, Mathematical Functions. Decision Making and Branching: Introduction, Decision Making with if Statement, Simple if Statement, The if…..else Statement, Nesting of if..else Statements, The else if Ladder, The Switch Statement, The ? : Operator. Decision Making and Looping: Introduction. The while Statement, The do Statement, The for Statement, Jumps in Loops Labeled Loops
- 7. Key Features of Java Platform independent Object-orientated programming language Strongly-typed programming language Interpreted and compiled language Automatic memory management
- 8. Difference between c and Java ⚫ 1. JAVA is Object-Oriented while C is procedural. Different Paradigms, that is. ⚫ C is more procedure-oriented while JAVA is data-oriented. ⚫ 2. Java is an Interpreted language while C is a compiled language. ⚫ We all know what a compiler does. It takes your code & translates it into something the machine can understand-that is to say-0’s & 1’s-the machine-level code. That’s exactly what happens with our C code-it gets ‘compiled’. While with JAVA, the code is first transformed to what is called the bytecode. This bytecode is then executed by the JVM(Java Virtual Machine). For the same reason, JAVA code is more portable. ⚫ 3. C is a low-level language while JAVA is a high-level language. ⚫ C is a low-level language(difficult interpretation for the user, closer significance to the machine- level code) while JAVA is a high-level lagunage(abstracted from the machine-level details, closer significance to the program itself). ⚫ 4. C uses the top-down {sharp & smooth} approach while JAVA uses the bottom-up {on the rocks} approach. ⚫ In C, formulating the program begins by defining the whole and then splitting them into smaller elements. JAVA(and C++ and other OOP languages) follows the bottom-up approach where the smaller elements combine together to form the whole. ⚫ 5. Pointer go backstage in JAVA while C requires explicit handling of pointers. ⚫ When it comes to JAVA, we don’t need the *’s & &’s to deal with pointers & their addressing. More formally, there is no pointer syntax required in JAVA. It does what it needs to do. While in JAVA, we do create references for objects.
- 9. C++ and JAVA C++ JAVA C++ supports pointers Java does not pointers C++ run and compile using compiler which converts source code into machine level languages so c++ is plate from dependents At compilation time Java Source code converts into byte code .The interpreter execute this byte code at run time and gives output .Java is interpreted for the most part and hence platform independent c++ is depends upon operating system machine etc Java is platform independent language c++ their is only compiler Java uses compiler and interpreter both C++ supports operator overloading java does not. Thread support is not available in Java Thread support is built-in Java Internet support does not exist Internet support is built-in Java but not in C++. Java does not support header file, include library files just like C++ . Java use import to include different Classes and methods. Goto statement exist in C++ There is no goto statement in Java. operator overloading exist in c++. Java has method overloading, but no operator overloading just like c++. C++ support unsigned integer. Java does not support unsigned integer.
- 10. Java and Internet: ⚫ Java is strongly associated with the Internet. Internet users can use Java to create applet programs and run them locally using a "Java- enabled browser" such as HotJava. ⚫ They can also use a Java-enabled browser to download an applet located on a computer anywhere in the Internet and run it on his local computer. ⚫ In fact, Java applets have made the Internet a true extension of the storage system of the local computer. ⚫ Internet users can also setup their websites containing java applets that could be used by other remote users of Internet. This feature made Java most popular programming language for Internet.
- 11. Java and WWW • Java’s Contribution to the Internet (World Wide Web): ⚫ Great feature of the java is that java is platform independent. ⚫ It can word on any network,any operating system thus making programs more flexible. ⚫ In addition to simplifying web programming in general, Java innovated a new type of networked program called the applet that changed the way the online world thought about content. ⚫ Portability and Security of java makes World wide web to spread across globe.
- 12. www ⚫ World Wide Web (WWW) is an open-ended information retrieval system designed to be used in the Internet's distributed environment. This system contains Web pages that provide both information and controls. Web system is open-ended and we can navigate to a new document in any direction. This is made possible with the help of a language called Hypertext Markup Language (HTML). Web pages contain HTML tags that enable us to find, retrieve, manipulate and display documents worldwide.
- 13. Java ⚫ Java was meant to be used in distributed environments such as Internet. Since, both the Web and Java share the same philosophy, Java could be easily incorporated into the Web system. Before Java, the World Wide Web was limited to the display of still images and texts. However, the incorporation of Java into Web pages has made it capable of supporting animation, graphics, games, and a wide range of special effects.
- 14. • A. Java Applets : ⚫ An applet is a special kind of Java program that is designed to be transmitted over the Internet and automatically executed by a Java- compatible web browser. ⚫ Applet can be downloaded on demand. ⚫ Applet programs can be run on ant java compatible browser. ⚫ Applets are intended to be small programs. ⚫ They are typically used to display data provided by the server, handle user input, or provide simple functions, such as a loan calculator, that execute locally, rather than on the server. ⚫ In essence, the applet allows some functionality to be moved from the server to the client.
- 15. • B. Security : ⚫ Applets can be downloaded to user PC . ⚫ They are executed independently without accessing other parts of user’s PC. ⚫ The ability of Java provides security and thus Java prove itself more secure. • C. Portability : ⚫ Java Programming is Portable. ⚫ Java Program is Operating System Independent. ⚫ Java Program is converted into byte code and byte code is executed by JVM. ⚫ Java Applets are thus portable and can be downloaded from any place in globe and can be executed on java compatible browser thus making java programs portable.
- 16. • Five primary goals in the creation of the Java language : ⚫ It should be “simple, object-oriented and familiar”. ⚫ It should be “robust and secure”. ⚫ It should be “architecture-neutral and portable”. ⚫ It should execute with “high performance”. ⚫ It should be “interpreted, threaded, and dynamic”.