A class that implements an interface need to implement all the abstract methods ▻ For example, we can define Orange and Chicken classes that implement
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How to write a class that implements an interface using the keyword otherwise it must be an “abstract” class (more later) Interface Example: Iterator
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Interface example public interface Comparable{ public int compareTo(T o); } public class Name implements Comparable{ public int
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public abstract class MyClass { // data members interface must implement/ define all methods declared in the interface instanceof Example public class Lion
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Abstract class: incomplete class, useless by itself, meant for use as a Interface: a special limited kind of abstract class Real-Life Example (simplified)
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An abstract class that implements an interface might map the interface methods onto abstract methods For example: In this example, the class DerivedClass is
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An abstract class in a class hierarchy represents a generic concept • Common elements in An interface establishes a set of methods that a class will implement • Similar to Example: a method to compute the average of an array of Objects
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Class Invariant: All objects have a name string and hire date For example, perhaps the HourlyEmployee class All of the methods in an interface are abstract
OOP InheritanceAbstractsInterfaces
Interface. • A special type of class - a “pure” abstract class: • No data (only static or final). • Defines a set of abstract methods (prototypes).
29-Jan-2003 ... an abstract class (no new). • Like an interface ... Example: Animals as an Abstract Class ... Comparing Abstract Classes and Interfaces.
09-Dec-2020 interface uses the keyword implements. – Examples abstract class Fruit implements Edible {. // Data fields constructors
06-Aug-2013 A Java class that cannot be instantiated but instead serves as a superclass to hold common code and declare abstract behavior.
In this example Shape is the abstract class
For example you can specify that the objects are comparable
CS61B Lecture #9: Interfaces and Abstract Classes Instance method can be abstract: No body given; must be supplied ... Concrete Subclass Examples.
https://www.cs.colostate.edu/~cs200/Spring16/slides/08-advOO.pdf
superclass is concrete. For example the Object class is concrete
In this example the interface A has only one method. Its implementation is provided by. B and C classes. In a real scenario
Abstract classes vs. Interfaces