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Jumping Into Java Then!
 

Jumping Into Java Then!

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A presentation that I gave in one of the late night sessions in my college, aimed at bringing an awesome bunch of my juniors up to speed with Java.

A presentation that I gave in one of the late night sessions in my college, aimed at bringing an awesome bunch of my juniors up to speed with Java.

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    Jumping Into Java Then! Jumping Into Java Then! Presentation Transcript

    • Java: It’s OOP on Steroids*!
      Presented by: Milan a.k.amondodello
      ( Aah! Back into known territory! )
      *STATUTORY WARNING: This presentation is not an attempt to popularize steroids. Steroids and more specifically drugs are injurious to health. One must never buy drugs. One should rather become a rockstar. Then you get them for free :P :D !
    • Topics (intended) to be covered
      OOP: A rrrrapid review
      C / C++ and now … err … Java?
      Java: The new kid on the block!
      Regular Feature: Some Gyaaan!
      What NEXT?
    • OOP: A quick look back
    • Hmm … so we meet again …
      OOP is a relatively ‘new’ programming paradigm
      Competes with Structured Programming
      Avoids REDUNDANCY, provides FLEXIBILITY
      Involves lot of jargons
      Modularity
      Abstraction / Data Encapsulation / Info Hiding
      Inheritance
      Polymorphism
    • C, C++ and now Java? Stop throwing jargons at me please!
    • Why C? Why C++?
      Procedural Programming: C
      C + Classes + … = C++
      Main problem: Lack of portability
      That’s primarily what Java builds upon …
    • Java is born …
    • Once upon a time…
      Started by Sun Inc. under codename OAK
      The Retransformation
      HotJava
      Built on the WORA paradigm
    • WORA: No it’s not a battle-cry!
      Stands for Write Once Read Anywhere
      Brainchild of James Gosling
      Stresses primarily on portability and strict adherence to specifications
      Enters JVM!
    • JVM: The Java Virtual Machine
      It’s Java’s own Interpreter
      Custom built for different platforms
      Just worry about your class file, Java takes care of the rest!
    • Architectural Layers
    • nuts-’n-bolts of a Java Program
    • The integral parts
      Header Files (Use import)
      Class Definition(s)
      main() within the class
    • A Java class format
      Class <class name>
      {
      //datamembers
      <access modifiers> <data type> <variable name>
      //function definitions
      <access modifiers> <return type> <function name> (comma-separated parameter list)
      {
      body – of – the - function
      }
      }
    • Java ripped apart!
    • This comprises Java –
      Variables/Constants/Arrays
      Arithmetic Expressions/Operators
      Control Flow Techniques
      Pointers/References (???)
      Methods
      Classes/Objects


      <This is only a glimpse … > !!!
    • Varrrrriables
      An element that varies
      Vary = change
      Contrast with CONSTANTS (Rock steady - do NOT change during program run)
      8 types:
      byte, short, int, long,
      float, double,
      boolean,
      char
    • Arithmetic Expressions
      Rules involving variables, constants, operators etc.
      Always evaluate to a VALUE
      Can be used in a helluva innovative ways
      Master them and half the battle is one
    • Control Flow
      Sequence
      Embedded in the structure
      Selection
      If ... Else
      Switch
      Iteration
      For
      Do... While
      While
    • Functions a.k.a Methods
      A small program in itself
      Self contained
      Input-process-output
      Function prototype
      Function definition
      Arguments/Parameters
    • Pointers ( ::fear::, still ?)
      Objects as references
      Call by Reference/Value
      Primitive datatypes – passed by value
      Objects – passed by reference
      Wrapper classes
    • Idiosyncrasies of Java(1 of 3)
      Case-sensitive
      Class Definitions do NOT end with a “;”
      No global variable concept
      No standalone main()
      No non-boolean value in conditional statements
    • Idiosyncrasies of Java(2 of 3)
      No structs, enumerations, unions
      No scope unary scope resolution operator
      “.” operator
      super keyword
      Data-types sizes are FIXED, independent of machine architecture
    • Idiosyncrasies of Java(3 of 3)
      Multiple inheritance NOT supported
      Exception handling typicality
      Treatment of ob1 = ob2 statements
      No destructors
      extends keyword
    • And now ... Yup, some Gyaan!
    • Do this to become a Java codewhiz!
      Be Disciplined
      Be Regular
      Try and compete in online coding competitions
      Practice (Remember it makes a man perfect ... and works for women as well!)
      Reference: http://java.sun.com/docs/books/tutorial/getStarted/index.html
    • Your turn now … any questions?
    • Thanks (m/)!