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TUT #3 (of Tutorial3 :)

TUT #3 (of Tutorial3 :). Still CSCB07. Interfaces. Templates for Objects I nterface is a group of related methods with empty bodies Classes implement interfaces, agreeing to certain predefined behavior Cannot instantiate an interface(no constructors/variables)

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TUT #3 (of Tutorial3 :)

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  1. TUT #3 (of Tutorial3 :) Still CSCB07

  2. Interfaces • Templates for Objects • Interface is a group of related methods with empty bodies • Classes implement interfaces, agreeing to certain predefined behavior • Cannot instantiate an interface(no constructors/variables) • Used for code clarity, OO and defining behavior

  3. Constructors • Create an instance of a class (i.e. an Object) • Platypus p1 = new Platypus(); • NO return type • Same name Class • Differ by input parameters (if more than one) • Purpose to initialize variables and other setup

  4. Encapsulation • Restricts direct access to the internals of your object • Prevents unwanted behavior (users do not know how the class stores its data) • Simplifies usage, OO • Technique of making the fieldsprivateand providing access to the fields via public methods

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