The document provides an introduction to Java, describing it as an object-oriented programming language that is platform-independent and has a history dating back to the early '90s. It covers Java syntax, packages, and the structure of Java programs, emphasizing the importance of classes and objects. Additionally, it outlines available learning resources and certifications, encouraging engagement with the Java community.

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

2. Agenda What is Java?

3. A little bit of history

4. Java performance

5. Java sintax

6. Java packages

7. Java applications

8. Demo

9. Where and how to learn Java

10. What is Java???

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

12. An IT Brand?

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

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

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

16. It has a system of automatic memory management.

17. A programming language

18. A platform

19. And where is Java? Java is everywhere...

20. Where is Java? It's here...

21. Where is Java? And here...

22. Where is Java? And here...

23. A little bit of history

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

25. Gosling's goals were to 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.

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

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

28. It is unclear if 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.

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

30. Java Architecture

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

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

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

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

35. Java platform Java Card Java SE Java EE Java ME Java FX

36. Java platform D:\My Presentation\Unijoyo Java Presentation\img\java platform.gif

37. Java Language Object oriented

38. Distributed

39. Simple

40. Multithread

41. Safe

42. Platform independent

43. 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)

44. Simple: No pointers, no garbage collector

45. Multithreading

46. Safe: restrictions on access to devices directly (pointers)

47. Java syntax

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

49. String Class Java provides special support for the strings via the java.lang.String class

50. It is not a primitive type.

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

52. Example with arithmetic operators 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

53. Example with posfix and 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

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

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

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

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

58. Java Packages

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

60. Each of these worlds are composed of objects .

61. Objects communicate through messages.

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

63. The &quot;box&quot; that holds the description of all objects of the same type is what is known as a class.

64. In turn, the classes with similar purposes can be grouped into packages.

65. The program execution begins at the &quot;main&quot; method of a class.

66. Package example

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

68. Each class must be found within a package.

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

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

71. 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); } }

72. Java packages examples java.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.

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

74. java.lang Primitive types are encapsulated in classes: Boolean

75. Byte

76. Character

77. Double

78. Float

79. Integer

80. Long

81. Short

82. Void

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

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

85. MIN_VALUE (min value for an “int”) Builders: Integer(int)

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

87. Getting a value as an “int”: intValue()

88. java.lang (III) Clases for char characters: clase String: set of characters non editable

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

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

91. String(char[])

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

93. java.lang (V) Manipulation string 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

94. 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)

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

96. out: &quot;standard” output stream. Usually, is the message window

97. err: &quot;standard&quot; error output stream. Usually is the message window Methods: getProperties(), gc() - force to use the memory administrator

98. 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).

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

100. The Java class libraries organized as a collection of packages.

101. A significant number of demonstration programs.

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

103. The NetBeans IDE is a development environment created based on open source platform from homonymous

104. Develop network-enabled Java Beans components.

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

106. CDDL and GPL 2 License.

107. www.netbeans.org

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

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

110. Questions

111. Next Steps Visit Osum project repository for more Java tech demos using NetBeans

112. Join Java groups inside osum and participate in the communities

113. Build your own Java programs

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

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

116. Sun Certified Web Component Developer for Java EE

117. Sun Certified Mobile Application Developer for Java ME

118. Sun Certified System/Network Admin for Solaris Operating System Free practice exams

119. Discounted exams fees for academic developers – only US$40 worldwide Fast Track Your Career with Sun!

120. Introduction to Java Tushar Chauhan [email_address] CCET, Wadhwan City.