Java programming
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A simple, object oriented, distributed, interpreted, robust, secure, architecture neutral, portable, high performance, multithreaded, dynamic language.
![TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, Dwarka Institutional Area, New Delhi-75
Create a Java Source File
• Pepare the file HelloWorld.java using an editor
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World!");
} }
• Since Java is object-oriented, programs are organized into
modules called classes, which may have data in variables and
subroutines called methods.
• Note that String is built-in and
• println is a member function for the System.out class](https://image.slidesharecdn.com/bharrrrrrtijavaprogppt-150601102647-lva1-app6891/85/Java-programming-12-320.jpg)
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Java programming
- 1. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Affiliated to Institution of G.G.S.IP.U, Delhi BCA Java Programming 20206 Ms. Bharti Dewani Assistant Professor
- 2. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 What is Java? A simple, object oriented, distributed, interpreted, robust, secure, architecture neutral, portable, high performance, multithreaded, dynamic language. From: Java: An Overview James Gosling, Sun Microsystems, February 1995.
- 3. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Why Java? • Java is a general-purpose, high-level programming language. • It’s almost entirely object-oriented • It has a vast library of predefined objects and operations called The Java Application Programming Interface OR JAVA API • It’s more platform independent – this makes it great for Web programming • It’s more secure • It’s a software-only platform running on top of other, hardware-based platforms.
- 4. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Features of Java • Simple • Architecture-neutral • Object-Oriented • Distributed • Compiled • Interpreted • Write once, run anywhere • Statically Typed • Multi-Threaded
- 5. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Features of Java (Contd.) • Portable • High-Performance • Robust • Secure • Extensible • Well-Understood • Garbage Collected That’s why they say … “ Java has changed programmer’s life . ”
- 6. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Java Applications and Java … lets • Stand-alone Applications – Just like any programming language • Applet – Run under a Java-Enabled Browser • Midlet – Run in a Java-Enabled Mobile Phone • Servlet – Run on a Java-Enabled Web Server
- 7. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Java Developer's Kit • Java's programming environment – Core Java API – compiler – interpreter – debugger – dis-assembler – profiler
- 8. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Java Developer's Kit (Contd.) Java source(.java)--java compiler-->java bytecode(.class) Java bytecode(.class)--java dis-assembler-->java source Java bytecode--java interpreter-->machine code (O/P)
- 9. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Java API • Collection of ready-made i.e pre-defined software components that provide many useful capabilities. • Grouped into libraries , packages of related components i.e collection of inter-related or similar classes and interfaces
- 10. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Core API – Essentials: Object, String, Input and Output... – Applets – Networking – Internationalization – Security – Software Components – Object Serialization – Java Database Connectivity (JDBC)
- 11. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Building Standalone JAVA Programs (on UNIX) The “Hello World” application
- 12. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Create a Java Source File • Pepare the file HelloWorld.java using an editor public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } } • Since Java is object-oriented, programs are organized into modules called classes, which may have data in variables and subroutines called methods. • Note that String is built-in and • println is a member function for the System.out class
- 13. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Compile and Run • Compile – javac HelloWorld.java • A file named HelloWorld.class is created if the compilation succeeds. • Run – java HelloWorld Output:- Hello World!
- 14. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Comparing Java with C , C++
- 15. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Java and C++ Comments are almost like C++ • /* This kind of comment can span multiple lines */ • // This kind is to the end of the line • /** * This kind of comment is a special * ‘javadoc’ style comment */
- 16. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Java and C Primitive data types are like C • Main data types are int, double, boolean, char • Also have byte, short, long, float • boolean has values true and false • Declarations look like C, for example, – double x, y; – int count = 0;
- 17. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Java and C Control statements are like C • if (x < y) smaller = x; • if (x < y){ smaller=x;sum += x;} else { smaller = y; sum += y; } • while (x < y) { y = y - x; } • do { y = y - x; } while (x < y) • for (int i = 0; i < max; i++) sum += i; • BUT: conditions must be boolean !
- 18. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Java Vs. C • C is procedural whereas Java is object oriented. • In C, almost everything is in functions • In Java, almost everything is in classes • There must be only one public class per file • The file name must be the same as the name of that public class, but with a .java extension • In Java, there is nothing called Pointers
- 19. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Java Vs. C++ • In Java,no preprocessor directives required • In Java, header files are not included but Predefined classes and interfaces can be imported to achieve Reusability. • Destructor() method is replaced by finalize() method • Only two contructors viz. default and parameterised are allowed in java • Multiple inheritence is achieved via a new concept called interface
- 20. TRINITY INSTITUTE OF PROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Thank you..