Java introduction by lara technologies
- 2. What is java? • A general-purpose object-oriented language. • Write Once Run Anywhere (WORA). • Designed for easy Web/Internet applications. • Widespread acceptance.
- 3. 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)
- 4. 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
- 5. Cont.. • 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.
- 6. 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.
- 7. 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.
- 8. 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.
- 9. Characteristics of Java • Java is architecture-neutral • Java is portable • Java’s performance • Java is multithreaded • Java is dynamic • Java is secure • Java is simple • Java is object-oriented • Java is distributed • Java is interpreted • Java is robust
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