abstract class and interface real time example

Java For Abstract Classes public abstract class LibraryItem { } 8 CISC 124, Winter 2016, Topic 5: Abstract Classes Interfaces Real-Life Example ( simplified)

The child of an abstract class must override the abstract methods of the parent, or A Java interface is a collection of abstract methods and constants • An abstract in Doable is given a definition Returns true if the candidate answer matches the answer The caller does not need the implementation at the compile time

Interface Abstract class in Java A class that is declared as abstract is known as abstract class It needs to In this example, Shape is the abstract class, its implementation is provided by the Rectangle Shape s=new Circle1();//In real scenario, object is provided through method e g getShape Output compile time error 

Inheritance, Abstract Classes and Interfaces 1 An object represents an entity in the real world that can be Returns a string representing the date and time Example x a specified character x Java matches Java any single character

package and an extended example illustrating polymorphism chapter: abstract classes, interfaces, instanceof operator, final methods, and final classes is a class, then x instanceof Y is true when x is not null and x is an object of class Y The Time class in Listing 4 5 has two int instance variables itsHour and itsMin to

Abstraction One of the most fundamental concept of OOPs is Abstraction But to the external world there is only one interface is available and rest of the complexity is Java Swing and Awt classes represent best examples for inheritance

Feature Interface Abstract Class Multiple inheritance A class may implement Example ▫ Paying an employee: ❑ Full-time employees – have a monthly pay (employee instanceof StaffMember); What will be the value of result? a) true b)

26 jui 2003 · OOP Inheritance, Abstract classes, Interfaces Manu Kumar Last time – Java Collections • Iterators • ArrayList example – OOP • Inheritance Today or next time “User Events” – clicking, typing etc happen in realtime