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Transcript
USAGE
DEFINITION
INTERFACE:
- methods without their bodies
- constant fields - implicitly public, final, and static
- classes implementing an interface should implement all their methods!
- a class can implement multiple interfaces
JAVA
Interface:
- can be extended by another interface
- can be implemented by a class
- can be passed as parameter to a method -> if an interface type is required as an argument, you can pass any object whose class implements this interface
ABSTRACT class:
- can be extended by another class
ABSTRACT class can have:
- data member,
- abstract method
- non-abstract method
- constructor
- cannot be instantiated
- a class extending an abstract class shouldn't extend all its methods
- a class can only extend only one single [abstract] class
1 - N: 1 interface can EXTEND multiple interfaces
INTERFACE
1 - N: 1 class can IMPLEMENT multiple interfaces
Abstract CLASS
MAIN
1 - 1: 1 class can EXTEND one single other class
1 - N: 1 class can BE EXTENDED by multiple classes
Static CLASS
CLASS
ABSTRACTION
STATIC:
- @class level, not associated with an instance of a class
- static values:
- passed by reference
STATIC class:
- can be used by other class or in main
- variables and methods are accessed only at CLASS level:
- eg: Integer.parseInt()
CANNOT
1 - N: 1 class can be INSTANTIATED by multiple objects
OBJECT
OBJECTS:
- CREATE - to instantiate objects through constructors:
- new - key word:
- allocates the memory described by the class, and runs the constructor
- returns a reference to the allocated memory
- apply methods defined in the class definition on the objects:
- RETRIEVE info: sufragerie.scaun.getCuloare()
- UPDATE info:
CLASSES - contains:
- variables
- primitive types
- ENUM / finals
- reference types (classes)
- Date / String / Integer or
- custom classes defined by us
- collections
- methods - contains all logic & operations
- takes parameters:
- none ()
- a primitive type, an object, an interface
- returns a result:
- void
- a primitive type, an object
- eg:
- constructors - to instantiate an object
- getter, setter
- other operations
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