• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Introduction to Java programming
 

Introduction to Java programming

on

  • 371 views

Java Introductory tutorial covering its History, First Java Application, Data types, Variables, Strings, Assignments, Math, Boolean expressions Relational operations, If statements, System.exit. By ...

Java Introductory tutorial covering its History, First Java Application, Data types, Variables, Strings, Assignments, Math, Boolean expressions Relational operations, If statements, System.exit. By TOPS Technologies. http://www.tops-int.com

Statistics

Views

Total Views
371
Views on SlideShare
371
Embed Views
0

Actions

Likes
1
Downloads
32
Comments
1

0 Embeds 0

No embeds

Accessibility

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel

11 of 1 previous next

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
  • Sir I want to make professional software developer using JAVA what I have to learn ? I already know fundamental, OOP and data structure and algo using JAVA. abdulrehman.muhammadi@gmail.com
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Introduction to Java programming Introduction to Java programming Presentation Transcript

    • Tuesday,September10,2013TOPSTechnologies-JavaTutorial 1
    • TOPSTechnologies–JavaIntroductoryTutorial 2 INTRODUCTION TO JAVA TOPS Technologies – Java Introductory Tutorial Module :1( theory) http://www.tops-int.com/
    • TOPS Technologies – Java Introductory tutorial M1 3 WELCOME • History • First Java Application • Data types • Variables • Strings • Assignments • Math, Boolean expressions • Relational operations • If statements • System.exit
    • TOPS Technologies – Java Introductory tutorial M1 4 VERY BRIEF HISTORY • Started in 1991 by SUN Microsystems • Targeted at consumer electronics. Wanted reliable programming language. • Integrated into browsers • Evolved into write once run anywhere, integrates into Netscape • General purpose libraries released
    • TOPS Technologies – Java Introductory tutorial M1 5 COURSE INFORMATION  Textbook: Java in a Nutshell Reading class 1 chapters 1,2
    • 6 BASIC DEFINITIONS • Java is an object oriented language. • Object • Method • Class • Applications • Applets • Native classes • Threads • Exceptions TOPS Technologies – Java Introductory tutorial M1
    • TOPS Technologies – Java Introductory tutorial M1 7 FIRST APPLICATION /** *Hello World, first application, only output. */ import java.io.*; public class hello{ public static void main (String [] args) { System.out.println(“Hello Worldn”); } //end main }//end class
    • 8 HOW TO GET IT RUNNING • Text in hello.java file • Why? • To compile: • javac hello.java • To run: • java hello TOPS Technologies – Java Introductory tutorial M1
    • 9 NOTICE: • Java is CASE SENSITIVE!! • Whitespace is ignored by compiler • Whitespace makes things easier to read…hence it affects your grade  • File name has to be the same as class name in file. • Need to import necessary class definitions TOPS Technologies – Java Introductory tutorial M1
    • 10 VARIABLES • Variables: • Name • Type • Value • Naming: • May contain numbers,underscore,dollar sign, or letters • Can not start with number • Can be any length • Reserved keywords • Case sensitive TOPS Technologies – Java Introductory tutorial M1
    • 11 PRIMITIVE DATA TYPES Byte 8 -27 27-1 Short 16 -215 215-1 Int 32 -231 231-1 Long 64 Float 32 Double 64 Boolean 1 0 1 Char 16 TOPS Technologies – Java Introductory tutorial M1
    • 12 ASSIGNMENT • = • Example: • int n; • n = 10; • or • int n = 10; //same TOPS Technologies – Java Introductory tutorial M1
    • 13 STRINGS • Not a primitive class, its actually something called a wrapper class • To find a built in class‟s method use API documentation. • String is a group of char‟s • A character has single quotes • char c = „h‟; • A String has double quotes • String s = “Hello World”; • Method length • int n = s.length; TOPS Technologies – Java Introductory tutorial M1
    • 14 USING STRINGS public class hello{ public static void main (String [] args) { String s = “Hello Worldn”; System.out.println(s); //output simple string } //end main }//end class hello TOPS Technologies – Java Introductory tutorial M1
    • 15 MATH • Unary • int x = -9; • Regular math (+,-,*,/) • int y = 3+x; • % modulo operator TOPS Technologies – Java Introductory tutorial M1
    • 16 INCREMENTING • Increment and Decrement • i++ equivalent to i = i + 1; • Can also do ++i, which uses i before incrementing it. • Decrementing: i--; TOPS Technologies – Java Introductory tutorial M1
    • 17 CASTING int n = 40; Wrong : byte b = n; why?? Right: byte b = (byte) n; Type casting converts to target type TOPS Technologies – Java Introductory tutorial M1
    • 18 CASTING II • Type char is stored as a number. The ASCII value of the character. • A declaration of : • char c = „B‟; stores the value 66 in location c can use its value by casting to int how?? TOPS Technologies – Java Introductory tutorial M1
    • 19 ASSIGNMENT • += • -= • *= • /= • %= TOPS Technologies – Java Introductory tutorial M1
    • 20 BOOLEAN EXPRESSIONS • boolean b b will be either true (1) or false (0) • Logical operations: !(not), && (and) || (or) • boolean a,b; a = true; b = false; System.out.println (“a && b is “ + (a && b)); TOPS Technologies – Java Introductory tutorial M1
    • 21 RELATIONAL OPERATORS  == equality  != inequality  > greater than  < less than  >= greater than or equal to  <= less than or equal to TOPS Technologies – Java Introductory tutorial M1
    • 22 THE IF - BRANCHING STATEMENT • if ( x < y) { • x = y; • } • if ( x < y ) { x = y; } else { x = 88; } TOPS Technologies – Java Introductory tutorial M1
    • 23 IF/ELSE • if (logic condition) { something } else if (logic condition) { something } else { something else } TOPS Technologies – Java Introductory tutorial M1
    • 24 NESTED IF if ( x < 0 ) { System.out.println( “ x is negative “ ); } else { if ( x > 0 ) { System.out.println ( “x is positive” ); } //end if x > 0 else { System.out.println ( “x is zero “ ); } } //end else x >=0 TOPS Technologies – Java Introductory tutorial M1
    • 25 SWITCH/CASE Switch(variable) { case(1): something; break; case(23): something; break; default: something; } TOPS Technologies – Java Introductory tutorial M1
    • 26 EXCEPTIONS • Java exception object. • java.io.Exception most general one. Some exception like in Throwable class define methods to get the message. TOPS Technologies – Java Introductory tutorial M1
    • 27 TRY….CATCH BLOCKS. Try { ……. } catch ( IOException v) { ………. } TOPS Technologies – Java Introductory tutorial M1
    • 28 SYSTEM.OUT.PRINTLN • println is a method in the Printstream class. • Defined: • public void println(String x) can be any type of string or combination string using addition to join parts. Example: println(“hello “ + “world “ + x); TOPS Technologies – Java Introductory tutorial M1
    • 29 SYSTEM.EXIT() • One method in java.lang.System • Defined: public static void exit ( int status) • Terminates currently running Java VM • Status is status code, non zero will usually mean something abnormal. • Used at end to indicate success, or in middle to signal problems. TOPS Technologies – Java Introductory tutorial M1