Introduction To Java.

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Introduction to JavaTushar Chauhan Osum Leader C.U.Shah College Of Engineering & Technology, Wadhwan City

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Agenda What isJava?

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A little bitof history

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Java performance

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Java sintax

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Java packages

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Java applications

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Demo

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Where and howto learn Java

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What is Java???

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An exotic island...?Friendly people, spicy food, beautiful beaches

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An IT Brand?

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What is Java?An object oriented programming language developed in the early '90s.

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The language itselftakes much of its syntax from C and C + + but has a simpler object model and eliminates low-level tools.

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It is platformindependent. Early implementations of Java had the slogan: "write once, run anywhere"

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It has asystem of automatic memory management.

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A programming language

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A platform

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And where isJava? Java is everywhere...

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Where is Java?It's here...

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Where is Java?And here...

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Where is Java?And here...

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A little bitof history

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A little bitof history It was conducted by a team of 13 people, led by James Gosling.

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Gosling's goals wereto implement a virtual machine and a language with a structure and syntax similar to C + +. Java was originally created as a programming tool for a project set-top box known as * 7.

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A little bitof history (II) The language was originally called "Oak". Later renamed "Green" after discovering that Oak was already a trademark.

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The term "Java"was coined in a coffee store frequented by members of the team.

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It is unclearif it is an acronym or not, some hypotheses suggest that it could be the initials of its creators: J ames Gosling, A rthur V an Hoff, and A ndy Bechtolsheim. Other advocates of " J ust A nother V ague A cronym.

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The most acceptedhypothesis is that Java is named after a type of coffee available in the coffee store.

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Java Architecture

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.java, .class, JVM???In Java, source code is written in a plain text file with a .Java extension

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Then, the codeis compiled into a .Class file. A .Class does not contain native code for a type of processor, instead it contains bytecodes.

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Finally, the applicationis interpreted by the Java virtual machine, transforming the bytecode to native code at runtime.

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Bytecode The bytecodeis the native language of any implementation of Java Virtual Machine. In this way, a Java program runs on any platform with a JVM.

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Java platform JavaCard Java SE Java EE Java ME Java FX

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Java platform D:\MyPresentation\Unijoyo Java Presentation\img\java platform.gif

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Java Language Objectoriented

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Distributed

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Simple

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Multithread

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Safe

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Platform independent

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Some concepts... Distributed:Java is distributed because it offers support for distributed network technologies such as RMI (remote method invocation), CORBA (common object request broker architecture) and URI (universal resource locator)

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Simple: No pointers,no garbage collector

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Multithreading

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Safe: restrictions onaccess to devices directly (pointers)

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Java syntax

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Java syntax indetail Variable initialization The Java language is strongly typed, which means that all variables must be declared before use. int unaVariable = 1;

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String Class Javaprovides special support for the strings via the java.lang.String class

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It is nota primitive type.

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However, by overloadingoperators you can perform operations such as: String unString = “Juan” + “ ” + “Perez” ; Java also provides a wide range of operations to manipulate instances of this class.

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Example with arithmeticoperators int i=2+3; // i equals 5 i=i+1; //i equals 6 i=6*2; //i equals 12 i=2+5*2%8; //i equals 4

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Example with posfixand unary operators int i=5; // i equals 5 System.out.println(i); //print:5 System.out.println(++i); //print:6 System.out.println(i++); //print:6 System.out.println(i); //print:7

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Control sentences: if if(expr){ .... } if(expr) sentencia; if(expr){ .... } else { .... }

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Control sentences: switch Switch (num){ case num1:...break; case num2:...break; default:...break; }

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Control sentences: while and do-while while (expr){ .... } do { .... }while(expr);

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Control sentences: for for (exprInic; stopCond; nextStep){ .... } for (int i=0; i<10; i++) { System.out.println(i); } //print numbers from 0 to 9

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Java Packages

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Java program structureThe object-oriented programming structure is that each program is a simulation of a real or virtual world.

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Each of theseworlds are composed of objects .

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Objects communicate through messages.

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Therefore, an object-orientedprogram is nothing more than a configuration of a set of objects and messages sent between them.

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The "box" thatholds the description of all objects of the same type is what is known as a class.

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In turn, theclasses with similar purposes can be grouped into packages.

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The program executionbegins at the "main" method of a class.

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Package example

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Rules for creatingclasses and packages Java classes are deployed in separate files.

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Each class mustbe found within a package.

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The file nameof implementing class must match the name of the class.

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The package structureshould match the directory structure. Eg: edu.sun.Ejemplo would be mapped to the file ... / edu / sun / Ejemplo.java

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Class structure Package person; Import java.util.Vector; public class Person { private Vector partners ; public Person() { this . partners = new Vector(); } public Person(Vector friends) { this . partners = friends; } public void addPartners(Person aPerson){ this . partners .add(aPerson); } }

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Java packages examplesjava.io The packet input / output contains the file access classes: FileInputStream and FileOutputStream, and so on. java.lang Includes Java classes themselves: Object, Thread, Exception, System, Integer, Float, Math, String, etc.. java.util Miscellaneous useful classes for many things in programming.

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It includes, Date(date), Dictionary (dictionary), Random (random numbers) and Stack (stack FIFO).

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java.lang Primitive typesare encapsulated in classes: Boolean

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Byte

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Character

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Double

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Float

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Integer

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Long

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Short

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Void

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java.lang (II) Example:Integer (public interface): public final class Integer extends Number

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Variables: MAX_VALUE (max value for an “int”)

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MIN_VALUE (min valuefor an “int”) Builders: Integer(int)

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Integer(String) Methods:Conversion to other types: doubleValue(), floatValue(), intValue(), parseInt(String), toString(), valueOf(String)

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Getting a valueas an “int”: intValue()

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java.lang (III) Clasesfor char characters: clase String: set of characters non editable

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clase StringBuffer: set of editable characters public final class String extends Object implements Serializable

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java.lang (IV) Builders:String(byte[])

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String(char[])

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String(String) examples: char[] chars = {’a’,’b’,’c’}; String s = new String(chars); String s1 = “Hello”; String s2 = new String(s1);

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java.lang (V) Manipulationstring methods: length() , concat(String), indexOf(String), lastIndexOf(String) , toUpperCase(), ... Conversion from other types methods: valueOf(double), valueOf(int), ... Operator “+” in string is overloaded: 3+”abc”+3.4

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java.lang (VI) Class Math Constants: E, PI Methods: abs(double), acos(double), asin(double), atan, cos, exp, log, max(double, double), pow(double, double), round (float)

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java.lang (VII) Class System Variables (static): in: "standard” input stream. Usually is the keyboard

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out: "standard” outputstream. Usually, is the message window

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err: "standard" erroroutput stream. Usually is the message window Methods: getProperties(), gc() - force to use the memory administrator

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Other packages Package java.util Classes: Vector, Date, HashMap, StringTokenizer… Package java.text Classes: DateFormat, DecimalFormat… (formatting methods). Package java.math Classes: BigDecimal, BigInteger… (precision issues and more).

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Java Development Kit(JDK) El JDK consists of the following: The Java development tools, including the compiler, debugger and the Java interpeter.

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The Java classlibraries organized as a collection of packages.

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A significant numberof demonstration programs.

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Various support toolsand components, including source code of classes in the library. URL : java.sun.com/javase/downloads

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The NetBeansIDE is a development environment created based on open source platform from homonymous

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Develop network-enabled JavaBeans components.

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Jarda Tulach, whodesigned the IDE's basic architecture, came up with the name NetBeans to describe what they would do Network + Java Beans = NetBeans It is multiplatform

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CDDL and GPL2 License.

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www.netbeans.org

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Learning resources forJava Sun's Java Tutorials http://java.sun.com/docs/books/tutorial/ Sun Academic Iniciative http://sailearningconnection.skillport.com

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http://osum.sun.com/group/sai Java Passionhttp://www.javapassion.com/

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Questions

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Next Steps VisitOsum project repository for more Java tech demos using NetBeans

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Join Java groupsinside osum and participate in the communities

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Build your ownJava programs

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Next Steps Get FREE Web-based training on Java TM , Solaris TM & more! Visit: http://www.sunacademic.com

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Course registration codefor ABC University is XYZ Increase earnings potential with a Sun Certification! Sun Certified Associate/Programmer for the Java 2 Platform SE

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Sun Certified WebComponent Developer for Java EE

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Sun Certified MobileApplication Developer for Java ME

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Sun Certified System/NetworkAdmin for Solaris Operating System Free practice exams

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Discounted exams feesfor academic developers – only US$40 worldwide Fast Track Your Career with Sun!

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Introduction to JavaTushar Chauhan [email_address] CCET, Wadhwan City.

Introduction To Java.

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