Basic Java and Android Lecture By Daniel M.Idrees www.techgrasp.pk

1. Daniel Muhammad Idrees
www.techgrasp.pk
• Co-Founder of TechGrasp.pk
Email: enggdaniyal@hotmail.com
LinkedIn: www.linkedin.com/in/danielmidrees
Facebook: www.facebook.com/daniel.mi

2. What to Expect?
• Guidance
• Counseling
• Mentorship
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3. What not to Expect?
•Spoon Feeding!
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4. What is Java?
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5. Variables
• Data Types
o Primitive Types
o Non-primitive Types
• Local Variables
o Choosing Data Type
o Declaring (String string;)
o Initializing (string = “Hello”)
• Access Modifiers
• Class (static) Variables
• Instance (non-static) Variables
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6. Primitive Data Types
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7. Non-Primitive Data Types
• User-created
• Nullable
• Also called “Reference Types”
• Examples:
o Arrays
o String
o Lists
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8. Access Modifiers
• Access Modifiers
o Public
o Private
o Protected
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9. Operators
• Airthematic (+,-,*,/,++,--,%)
• Relational (==,>=,<=,!=,>,<)
• Logical (&&,||, !)
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10. Remember!
• ‘=‘ and ‘==‘ are not SAME!
• Never use ‘==‘ instead of
equals() when comparing
reference types
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11. Controlling Flow of Execution
• Conditions
o if – else
o switch
• Loops
o for
o while
• Special Control Statements
o break, continue
o Return
o try-catch-finally
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12. Function
• Signatures
• Naming
• Parameters
• Returning Values
• Static/Non-static Functions
• Calling Functions
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13. Arrays
• Arrays
o Collection of Similar Items in Sequence
o Contains values or references
o Fixed, Finite Length
• Length
• Index
• Initialization
• Enhanced for loop
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14. Best Coding Practices
• Indentation
• Naming Convention
• Use of Comments
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15. Be an Engineer!
Not a Mechanic!
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16. Object Oriented
Programming
• Objects and Classes
o Object: Real World Entity
o Class: Blueprint of an Object

17. Pillars of OOP
• Inheritance
o Is-A and Has-A Relationship
• Polymorphism
o Method Overriding
• Using super keyword
o Method Overloading
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18. Pillars of OOP
• Abstraction
o Biggest Challenge in OOP
o Hiding complexity
o Abstract and Concrete Classes
• Encapsulation
o Hiding Internal Details
o Relevant Attributes and Behavior
o Access/Mutate (simply, get/set)
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19. Interfaces
• Why No Multiple Inheritance in Java?
• Interfaces are Contracts
• Rules
o No Instances
o No Constructors
o Only Method Signatures
o Only static final Members
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20. Exception Handling
• Try block
• Catch Block
• Finally
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21. Read more JAVA from:
• Java Actually by Khalid A. Mughal
• The Complete Reference Java by Herbert Schildt
• http://www.tutorialspoint.com/java/
• http://javatpoint.com/java-tutorial
Take Help From:
• Stackoverflow
• Google!
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22. What we have covered:
• Variables
• Data types
• Access Modifiers
• Operators
• Controlling Flow of Execution
• Function
• Array
• Pillars of OOP (Abstraction, Inheritance, Polymorphism,
Encapsulation)
• Interfaces
• Exception Handling
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23. What I expect from you
• Learn
• Adapt
• Share
• Team Work
• Lead
• Make a Difference
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24. Thank You!
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