Introduction to Java


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Object Oriented Programming in JAVA By Professional Guru

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Introduction Welcome to the course Object Oriented Programming in JAVA. This course will cover a core set of computer science concepts needed to create a modern software application using Java. 9/15/2011 Object Oriented Programming using JAVA 2

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Course Objectives On completion of this course we will be able to: Identify the importance of Java . Identify the additional features of Java compared to C++ . Identify the difference between Compiler and Interpreter . Identify the difference between applet and application . Apply Object Oriented Principles of Encapsulations, Data abstraction, Inheritance, Polymorphism. Program using java API (Application Programming Interface). Program using Exception Handling, Files and Threads . Program Using applets and swings . 9/15/2011 Object Oriented Programming using JAVA 3

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Course Syllabus 9/15/2011 Object Oriented Programming using JAVA 4

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JAVA Basics

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Why Java is Important Two reasons : Trouble with C/C++ language is that they are not portable and are not platform independent languages. Emergence of World Wide Web, which demanded portable programs Portability and security necessitated the invention of Java

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History James Gosling - Sun Microsystems Co founder – Vinod Khosla Oak - Java, May 20, 1995, Sun World JDK Evolutions – JDK 1.0 (January 23, 1996) – JDK 1.1 (February 19, 1997) – J2SE 1.2 (December 8, 1998) – J2SE 1.3 (May 8, 2000) – J2SE 1.4 (February 6, 2002) – J2SE 5.0 (September 30, 2004) Java SE 6 (December 11, 2006) Java SE 7 (July 28, 2011)

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Cont.. Java Editions. J2SE(Java 2 Standard Edition) - to develop client-side standalone applications or applets. J2ME(Java 2 Micro Edition ) - to develop applications for mobile devices such as cell phones. J2EE(Java 2 Enterprise Edition ) - to develop server-side applications such as Java servlets and Java ServerPages.

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What is java? A general-purpose object-oriented language. Write Once Run Anywhere (WORA). Designed for easy Web/Internet applications. Widespread acceptance.

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How is Java different from C… C Language: Major difference is that C is a structure oriented language and Java is an object oriented language and has mechanism to define classes and objects. Java does not support an explicit pointer type Java does not have preprocessor, so we cant use #define, #include and #ifdef statements. Java does not include structures, unions and enum data types. Java does not include keywords like goto, sizeof and typedef. Java adds labeled break and continue statements. Java adds many features required for object oriented programming.

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How is Java different from C++… C++ language Features removed in java: Java doesn’t support pointers to avoid unauthorized access of memory locations. Java does not include structures, unions and enum data types. Java does not support operator over loading. Preprocessor plays less important role in C++ and so eliminated entirely in java. Java does not perform automatic type conversions that result in loss of precision.

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Cont… Java does not support global variables. Every method and variable is declared within a class and forms part of that class. Java does not allow default arguments. Java does not support inheritance of multiple super classes by a sub class (i.e., multiple inheritance). This is accomplished by using ‘interface’ concept. It is not possible to declare unsigned integers in java. In java objects are passed by reference only. In C++ objects may be passed by value or reference.

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Cont … New features added in Java: Multithreading, that allows two or more pieces of the same program to execute concurrently. C++ has a set of library functions that use a common header file. But java replaces it with its own set of API classes. It adds packages and interfaces. Java supports automatic garbage collection. break and continue statements have been enhanced in java to accept labels as targets. The use of unicode characters ensures portability.

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Cont … Features that differ: Though C++ and java supports Boolean data type, C++ takes any nonzero value as true and zero as false. True and false in java are predefined literals that are values for a boolean expression. Java has replaced the destructor function with a finalize() function. C++ supports exception handling that is similar to java's. However, in C++ there is no requirement that a thrown exception be caught.

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Characteristics of Java Java is simple Java is object-oriented Java is distributed Java is interpreted Java is robust Java is architecture-neutral Java is portable Java’s performance Java is multithreaded Java is dynamic Java is secure

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Java Environment Java includes many development tools, classes and methods Development tools are part of Java Development Kit (JDK) and The classes and methods are part of Java Standard Library (JSL), also known as Application Programming Interface (API). JDK constitutes of tools like java compiler, java interpreter and many. API includes hundreds of classes and methods grouped into several packages according to their functionality.

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Java is architecture-neutral 9/15/2011 Object Oriented Programming using JAVA JAVA Program Execution 17

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WORA(Write Once Run Anywhere) 9/15/2011 Object Oriented Programming using JAVA 18

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Editplus for Java Programming Edit Plus Software: EditPlus is a 32-bit text editor for the Microsoft Windows operating system. The editor contains tools for programmers, including syntax highlighting (and support for custom syntax files), file type conversions, line ending conversion (between Linux, Windows and Mac styles), regular expressions for search-and-replace, spell check etc). 9/15/2011 Object Oriented Programming using JAVA 19

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Hello world Program in java 9/15/2011 Object Oriented Programming using JAVA 20

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Execution of Hello world Program 9/15/2011 Object Oriented Programming using JAVA 21

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Summary: ava is a general purpose, high-level programming language developed by Sun Microsystems. The Java programming language was developed by a small team of engineers, known as the Green Team,

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