![BASIC SYNTAX OF JAVA
• ABOUT JAVA PROGRAMS, IT IS VERY IMPORTANT TO KEEP IN MIND THE FOLLOWING POINTS.
• CASE SENSITIVITY − JAVA IS CASE SENSITIVE, WHICH MEANS IDENTIFIER HELLO AND HELLO WOULD HAVE
DIFFERENT MEANING IN JAVA.
• CLASS NAMES − FOR ALL CLASS NAMES THE FIRST LETTER SHOULD BE IN UPPER CASE. IF SEVERAL WORDS ARE
USED TO FORM A NAME OF THE CLASS, EACH INNER WORD'S FIRST LETTER SHOULD BE IN UPPER CASE.
• EXAMPLE: CLASS MYFIRSTJAVACLASS
• METHOD NAMES − ALL METHOD NAMES SHOULD START WITH A LOWER CASE LETTER. IF SEVERAL WORDS ARE
USED TO FORM THE NAME OF THE METHOD, THEN EACH INNER WORD'S FIRST LETTER SHOULD BE IN UPPER CASE.
• EXAMPLE: PUBLIC VOID MYMETHODNAME()
• PROGRAM FILE NAME − NAME OF THE PROGRAM FILE SHOULD EXACTLY MATCH THE CLASS NAME.
• WHEN SAVING THE FILE, YOU SHOULD SAVE IT USING THE CLASS NAME (REMEMBER JAVA IS CASE SENSITIVE) AND
APPEND '.JAVA' TO THE END OF THE NAME (IF THE FILE NAME AND THE CLASS NAME DO NOT MATCH, YOUR
PROGRAM WILL NOT COMPILE).
• EXAMPLE: ASSUME 'MYFIRSTJAVAPROGRAM' IS THE CLASS NAME. THEN THE FILE SHOULD BE SAVED
AS 'MYFIRSTJAVAPROGRAM.JAVA'
• PUBLIC STATIC VOID MAIN(STRING ARGS[]) − JAVA PROGRAM PROCESSING STARTS FROM THE MAIN() METHOD
WHICH IS A MANDATORY PART OF EVERY JAVA PROGRAM.Muzammil Ali muzammilalifuuastian@gmail.com](https://image.slidesharecdn.com/java-basic-tutorial-170924123218/85/Java-basic-tutorial-for-beginners-10-320.jpg)
![MY FIRST PROGRAM IN JAVA
• PUBLIC CLASS MYFIRSTJAVAPROGRAM {
• PUBLIC STATIC VOID MAIN(STRING []ARGS) {
• SYSTEM.OUT.PRINTLN("HELLO WORLD");
• }
• }
Muzammil Ali muzammilalifuuastian@gmail.com](https://image.slidesharecdn.com/java-basic-tutorial-170924123218/85/Java-basic-tutorial-for-beginners-11-320.jpg)
Java basic-tutorial for beginners
- 1. JAVA BASIC TUTORIAL FOR BEGINNERS BY MUZAMMIL ALI [email protected] Muzammil Ali [email protected]
- 2. WHAT IS JAVA • JAVA IS A PROGRAMMING LANGUAGE AND A PLATFORM. • JAVA IS A HIGH LEVEL, ROBUST, SECURED AND OBJECT-ORIENTED PROGRAMMING LANGUAGE. • PLATFORM: ANY HARDWARE OR SOFTWARE ENVIRONMENT IN WHICH A PROGRAM RUNS, IS KNOWN AS A PLATFORM. SINCE JAVA HAS ITS OWN RUNTIME ENVIRONMENT (JRE) AND API, IT IS CALLED PLATFORM. Muzammil Ali [email protected]
- 3. • TYPES OF JAVA APPLICATIONS • THERE ARE MAINLY 4 TYPES OF APPLICATIONS THAT CAN BE CREATED USING JAVA PROGRAMMING: • 1) STANDALONE APPLICATION • IT IS ALSO KNOWN AS DESKTOP APPLICATION OR WINDOW-BASED APPLICATION. AN APPLICATION THAT WE NEED TO INSTALL ON EVERY MACHINE SUCH AS MEDIA PLAYER, ANTIVIRUS ETC. AWT AND SWING ARE USED IN JAVA FOR CREATING STANDALONE APPLICATIONS. • 2) WEB APPLICATION • AN APPLICATION THAT RUNS ON THE SERVER SIDE AND CREATES DYNAMIC PAGE, IS CALLED WEB APPLICATION. CURRENTLY, SERVLET, JSP, STRUTS, JSF ETC. TECHNOLOGIES ARE USED FOR CREATING WEB APPLICATIONS IN JAVA. • 3) ENTERPRISE APPLICATION • AN APPLICATION THAT IS DISTRIBUTED IN NATURE, SUCH AS BANKING APPLICATIONS ETC. IT HAS THE ADVANTAGE OF HIGH LEVEL SECURITY, LOAD BALANCING AND CLUSTERING. IN JAVA, EJB IS USED FOR CREATING ENTERPRISE APPLICATIONS. • 4) MOBILE APPLICATION • AN APPLICATION THAT IS CREATED FOR MOBILE DEVICES. CURRENTLY ANDROID AND JAVA ME ARE USED FOR CREATING MOBILE APPLICATIONS. Muzammil Ali [email protected]
- 4. • JAVA PLATFORMS / EDITIONS • THERE ARE 4 PLATFORMS OR EDITIONS OF JAVA: • 1) JAVA SE (JAVA STANDARD EDITION) • IT IS A JAVA PROGRAMMING PLATFORM. IT INCLUDES JAVA PROGRAMMING APIS SUCH AS JAVA.LANG, JAVA.IO, JAVA.NET, JAVA.UTIL, JAVA.SQL, JAVA.MATH ETC. IT INCLUDES CORE TOPICS LIKE OOPS, STRING, REGEX, EXCEPTION, INNER CLASSES, MULTITHREADING, I/O STREAM, NETWORKING, AWT, SWING, REFLECTION, COLLECTION ETC. • 2) JAVA EE (JAVA ENTERPRISE EDITION) • IT IS AN ENTERPRISE PLATFORM WHICH IS MAINLY USED TO DEVELOP WEB AND ENTERPRISE APPLICATIONS. IT IS BUILT ON THE TOP OF JAVA SE PLATFORM. IT INCLUDES TOPICS LIKE SERVLET, JSP, WEB SERVICES, EJB, JPA ETC. • 3) JAVA ME (JAVA MICRO EDITION) • IT IS A MICRO PLATFORM WHICH IS MAINLY USED TO DEVELOP MOBILE APPLICATIONS. • 4) JAVAFX • IT IS USED TO DEVELOP RICH INTERNET APPLICATIONS. IT USES LIGHT-WEIGHT USER INTERFACE API. Muzammil Ali [email protected]
- 5. • WHERE IT IS USED? • ACCORDING TO SUN, 3 BILLION DEVICES RUN JAVA. THERE ARE MANY DEVICES W • HERE JAVA IS CURRENTLY USED. SOME OF THEM ARE AS FOLLOWS: 1.DESKTOP APPLICATIONS SUCH AS ACROBAT READER, MEDIA PLAYER, ANTIVIRUS ETC. 2.WEB APPLICATIONS SUCH AS IRCTC.CO.IN, JAVATPOINT.COM ETC. 3.ENTERPRISE APPLICATIONS SUCH AS BANKING APPLICATIONS. 4.MOBILE 5.EMBEDDED SYSTEM 6.SMART CARD 7.ROBOTICS 8.GAMES ETC. Muzammil Ali [email protected]
- 6. HISTORY OF JAVA History of Java 1.Brief history of Java 2.Java Version History Java history is interesting to know. The history of java starts from Green Team. Java team members (also known as Green Team), initiated a revolutionary task to develop a language for digital devices such as set-top boxes, televisions etc. For the green team members, it was an advance concept at that time. But, it was suited for internet programming. Later, Java technology as incorporated by Netscape. James Gosling Currently, Java is used in internet programming, mobile devices, games, e-business solutions etc. There are given the major points that describes the history of java. 1) James Gosling, Mike Sheridan, and Patrick Naughton initiated the Java language project in June 1991. The small team of sun engineers called Green Team. 2) Originally designed for small, embedded systems in electronic appliances like set-top boxes. 3) Firstly, it was called "Greentalk" by James Gosling and file extension was .gt. 4) After that, it was called Oak and was developed as a part of the Green project. OAK IS TREE • WHY "OAK" NAME • 5) WHY OAK? OAK IS A SYMBOL OF STRENGTH AND CHOOSEN AS A NATIONAL TREE OF MANY COUNTRIES LIKE U.S.A., FRANCE, GERMANY, ROMANIA ETC. • 6) IN 1995, OAK WAS RENAMED AS "JAVA" BECAUSE IT WAS ALREADY A TRADEMARK BY OAK TECHNOLOGIES.. • JAVA IS AN ISLAND OF INDONESIA WHERE FIRST COFFEE WAS PRODUCED (CALLED JAVA COFFEE). Muzammil Ali [email protected]
- 7. POPULAR JAVA EDITORS • 1. NETBEANS • 2. INTELLIJ IDEA • 3. ECLIPSE • 4. JDEVELOPER • 5. DR. JAVA • 6. BLUEJ • 7. JCREATOR • 8. JGRASP Muzammil Ali [email protected]
- 8. FEATURES OF JAVA • OBJECT ORIENTED − IN JAVA, EVERYTHING IS AN OBJECT. JAVA CAN BE EASILY EXTENDED SINCE IT IS BASED ON THE OBJECT MODEL. • PLATFORM INDEPENDENT − UNLIKE MANY OTHER PROGRAMMING LANGUAGES INCLUDING C AND C++, WHEN JAVA IS COMPILED, IT IS NOT COMPILED INTO PLATFORM SPECIFIC MACHINE, RATHER INTO PLATFORM INDEPENDENT BYTE CODE. THIS BYTE CODE IS DISTRIBUTED OVER THE WEB AND INTERPRETED BY THE VIRTUAL MACHINE (JVM) ON WHICHEVER PLATFORM IT IS BEING RUN ON. • SIMPLE − JAVA IS DESIGNED TO BE EASY TO LEARN. IF YOU UNDERSTAND THE BASIC CONCEPT OF OOP JAVA, IT WOULD BE EASY TO MASTER. • SECURE − WITH JAVA'S SECURE FEATURE IT ENABLES TO DEVELOP VIRUS-FREE, TAMPER-FREE SYSTEMS. AUTHENTICATION TECHNIQUES ARE BASED ON PUBLIC-KEY ENCRYPTION. • ARCHITECTURE-NEUTRAL − JAVA COMPILER GENERATES AN ARCHITECTURE-NEUTRAL OBJECT FILE FORMAT, WHICH MAKES THE COMPILED CODE EXECUTABLE ON MANY PROCESSORS, WITH THE PRESENCE OF JAVA RUNTIME SYSTEM. • PORTABLE − BEING ARCHITECTURE-NEUTRAL AND HAVING NO IMPLEMENTATION DEPENDENT ASPECTS OF THE SPECIFICATION MAKES JAVA PORTABLE. COMPILER IN JAVA IS WRITTEN IN ANSI C WITH A CLEAN PORTABILITY BOUNDARY, WHICH IS A POSIX SUBSET. Muzammil Ali [email protected]
- 9. • ROBUST − JAVA MAKES AN EFFORT TO ELIMINATE ERROR PRONE SITUATIONS BY EMPHASIZING MAINLY ON COMPILE TIME ERROR CHECKING AND RUNTIME CHECKING. • MULTITHREADED − WITH JAVA'S MULTITHREADED FEATURE IT IS POSSIBLE TO WRITE PROGRAMS THAT CAN PERFORM MANY TASKS SIMULTANEOUSLY. THIS DESIGN FEATURE ALLOWS THE DEVELOPERS TO CONSTRUCT INTERACTIVE APPLICATIONS THAT CAN RUN SMOOTHLY. • INTERPRETED − JAVA BYTE CODE IS TRANSLATED ON THE FLY TO NATIVE MACHINE INSTRUCTIONS AND IS NOT STORED ANYWHERE. THE DEVELOPMENT PROCESS IS MORE RAPID AND ANALYTICAL SINCE THE LINKING IS AN INCREMENTAL AND LIGHT- WEIGHT PROCESS. • HIGH PERFORMANCE − WITH THE USE OF JUST-IN-TIME COMPILERS, JAVA ENABLES HIGH PERFORMANCE. • DISTRIBUTED − JAVA IS DESIGNED FOR THE DISTRIBUTED ENVIRONMENT OF THE INTERNET. • DYNAMIC − JAVA IS CONSIDERED TO BE MORE DYNAMIC THAN C OR C++ SINCE IT IS DESIGNED TO ADAPT TO AN EVOLVING ENVIRONMENT. JAVA PROGRAMS CAN CARRY EXTENSIVE AMOUNT OF RUN-TIME INFORMATION THAT CAN BE USED TO VERIFY AND RESOLVE ACCESSES TO OBJECTS ON RUN-TIME. Muzammil Ali [email protected]
- 10. BASIC SYNTAX OF JAVA • ABOUT JAVA PROGRAMS, IT IS VERY IMPORTANT TO KEEP IN MIND THE FOLLOWING POINTS. • CASE SENSITIVITY − JAVA IS CASE SENSITIVE, WHICH MEANS IDENTIFIER HELLO AND HELLO WOULD HAVE DIFFERENT MEANING IN JAVA. • CLASS NAMES − FOR ALL CLASS NAMES THE FIRST LETTER SHOULD BE IN UPPER CASE. IF SEVERAL WORDS ARE USED TO FORM A NAME OF THE CLASS, EACH INNER WORD'S FIRST LETTER SHOULD BE IN UPPER CASE. • EXAMPLE: CLASS MYFIRSTJAVACLASS • METHOD NAMES − ALL METHOD NAMES SHOULD START WITH A LOWER CASE LETTER. IF SEVERAL WORDS ARE USED TO FORM THE NAME OF THE METHOD, THEN EACH INNER WORD'S FIRST LETTER SHOULD BE IN UPPER CASE. • EXAMPLE: PUBLIC VOID MYMETHODNAME() • PROGRAM FILE NAME − NAME OF THE PROGRAM FILE SHOULD EXACTLY MATCH THE CLASS NAME. • WHEN SAVING THE FILE, YOU SHOULD SAVE IT USING THE CLASS NAME (REMEMBER JAVA IS CASE SENSITIVE) AND APPEND '.JAVA' TO THE END OF THE NAME (IF THE FILE NAME AND THE CLASS NAME DO NOT MATCH, YOUR PROGRAM WILL NOT COMPILE). • EXAMPLE: ASSUME 'MYFIRSTJAVAPROGRAM' IS THE CLASS NAME. THEN THE FILE SHOULD BE SAVED AS 'MYFIRSTJAVAPROGRAM.JAVA' • PUBLIC STATIC VOID MAIN(STRING ARGS[]) − JAVA PROGRAM PROCESSING STARTS FROM THE MAIN() METHOD WHICH IS A MANDATORY PART OF EVERY JAVA PROGRAM.Muzammil Ali [email protected]
- 11. MY FIRST PROGRAM IN JAVA • PUBLIC CLASS MYFIRSTJAVAPROGRAM { • PUBLIC STATIC VOID MAIN(STRING []ARGS) { • SYSTEM.OUT.PRINTLN("HELLO WORLD"); • } • } Muzammil Ali [email protected]