java abstract class method return subclass

Abstract Classes and Abstract Methods implement all the abstract methods the subclass ... An interface is treated like a special class in Java:.

A subclass can have only one superclass because Java doesn't support You would use abstract classes and abstract methods to describe generic.

Superclass abstract methods are generally omitted in the UML diagram for subclasses. Page 3. (c) Pearson Education Inc. & Paul Fodor (CS Stony Brook).

the name suggests subclasses inherit components from their superclass. These In Section 5.3.1

Methods that subclasses should implement are declared abstract overridden behavior and then returns to the superclass to continue the common code.

objects cannot be created but subclass class and a default is available: non-abstract method ... using this interface. (method arguments/return value).

Every class inherits (implicitly) from the Object Java's inheritance keywords. • A class ... The subclass need only define the fields and methods that.

subclasses: Abstract Classes public abstract class Shape { … /** Return the area of this shape */ public abstract double area() ;. } Syntax: If a method has 

Differentiate the abstract classes and Java interfaces. – Define methods using correct subclass version of the method is called

Clients only know about abstract class(es) defining the interfaces return width * height ... Patterns: Abstract Factory Factory Method

An abstract method is a method declaration without a method body An abstract method specifies behavior but no implementation Example: In the Number class 

Subclasses must implement all abstract methods or must also be abstract classes • Why make a method abstract? – Provide some default behaviors in concrete

An abstract method is a method that is declared without an implementation (without braces and followed by a semicolon) like this: abstract void moveTo(double 

The abstract Calendar class and its GregorianCalendar subclass Interfaces The return value from the max method is of the Comparable type So

Abstract Classes and Abstract Methods implement all the abstract methods the subclass An interface is treated like a special class in Java:

the all the fields and methods of the existing class Java's inheritance keywords The subclass need only define the fields and methods that

The method body will be defined by its subclass Abstract method A normal class (non-abstract class) cannot have abstract methods Syntax: return 7;

For example SBI ICICI and AXIS banks could provide 8 7 and 9 rate of interest class Bank{ int getRateOfInterest(){return 0;} } class SBI extends Bank{

An abstract method defines the method name and arguments but there's no method code Subclasses must provide an implementation Abstract Class

public class derived-class-name { public return-type method-name(params) { statements; } } Some subclass is required to override the abstract method and