Defining a Class in Java

Printer USS Code 128 in Java Defining a Class
123 Defining a Class
ANSI/AIM Code 128 Generation In Java
Using Barcode encoder for Java Control to generate, create Code 128 Code Set B image in Java applications.
1231 Superclasses and Inheritance
Print Bar Code In Java
Using Barcode creator for Java Control to generate, create barcode image in Java applications.
One of the most important features of an object orientated language is the ability to implement inheritanceThink of inheritance as the power to define a new class by extending an existing classThe existing class is called the superclass, and the new class is called the subclassWe can implement a hierarchy of classes by continuing to extend the subclass by defining its own subclass! The benefit is that we can reuse code that we ve already written In the next example, we ll see how to create a new type of Customer class called RetailCustomer by using our existing Customer data type Retail Customers have some additional properties to identify the state that taxes them and the discount percentage that we ll offer them as a special type of customer
Barcode Scanner In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
var props = { discountPercent: 0}; var init = function( name, taxingState ) { // "name" parameter is used by superclass constructor thistype = "RETAIL"; thisstatus = "ACTIVE"; thistaxingState = taxingState; }; dojodeclare("RetailCustomer", Customer, init, props); c1 = new RetailCustomer("ABC Photos", "IL");
Code 128C Creator In C#.NET
Using Barcode creator for Visual Studio .NET Control to generate, create Code128 image in .NET framework applications.
When a new RetailCustomer object is created, the constructor for superclass runs first, and then the init function for the subclass runs So init can override values provided by superclassThe superclass function is named so because it acts as an inheritance mechanism that can be overridden in the subclassThis provides reuse of the code from the superclassThe init function contains arguments for all the arguments required by the superclass constructor in addition to any it needs for its own work Why not put the property discountPercent in the constructor and assign it to 0 there That way would work, but by convention we reserve the constructor for properties that are dependent on what parameters are passed to the constructor when the object is created So to be more correct, we should really move the assignment of type and status from the init function to the props object
Code 128B Generation In VS .NET
Using Barcode printer for ASP.NET Control to generate, create Code 128 Code Set C image in ASP.NET applications.
1232 API for dojodeclare
Draw Code 128B In .NET
Using Barcode creator for Visual Studio .NET Control to generate, create Code 128 image in Visual Studio .NET applications.
The following table describes the arguments used when calling the dojodeclare methodThe method signature is: dojodeclare(className, superclass, init, props)
Code128 Creator In Visual Basic .NET
Using Barcode printer for .NET framework Control to generate, create Code128 image in Visual Studio .NET applications.
12
Print Data Matrix ECC200 In Java
Using Barcode maker for Java Control to generate, create Data Matrix image in Java applications.
Objects and Classes
Barcode Drawer In Java
Using Barcode generation for Java Control to generate, create bar code image in Java applications.
Table 121 Parameter Name
UCC-128 Creator In Java
Using Barcode maker for Java Control to generate, create GS1 128 image in Java applications.
Description of dojodeclare Function Parameter Data Type
Code39 Creator In Java
Using Barcode encoder for Java Control to generate, create Code39 image in Java applications.
String
UPC Code Creation In Java
Using Barcode creation for Java Control to generate, create GTIN - 12 image in Java applications.
Description and Usage of Parameter
Paint Leitcode In Java
Using Barcode generator for Java Control to generate, create Leitcode image in Java applications.
Class Name The name of the constructor (loosely, a class ) All classes are concrete Abstract classes are not supported
Code 128B Encoder In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create ANSI/AIM Code 128 image in ASP.NET applications.
className
Paint Data Matrix ECC200 In .NET Framework
Using Barcode encoder for ASP.NET Control to generate, create Data Matrix 2d barcode image in ASP.NET applications.
superclass
UPCA Maker In Visual Studio .NET
Using Barcode creator for Visual Studio .NET Control to generate, create UPC Code image in .NET applications.
Function or Array of Functions
Paint Bar Code In Visual C#
Using Barcode creation for .NET Control to generate, create barcode image in .NET applications.
Superclass If it is an array, the first element is used as the prototypical ancestor, and any following functions become mixin ancestors Specify null when there is no superclass Using null is the equivalent of the no-args default constructor in Java
Code 3/9 Generation In .NET Framework
Using Barcode maker for VS .NET Control to generate, create Code 3 of 9 image in .NET applications.
init
Painting EAN / UCC - 14 In .NET
Using Barcode creator for .NET Control to generate, create EAN / UCC - 14 image in .NET framework applications.
Function
GS1 - 12 Maker In .NET
Using Barcode generator for ASP.NET Control to generate, create UPC-A Supplement 5 image in ASP.NET applications.
Constructor Function An initializer function called when an object is instantiated from this constructor Properties can be added in this function by using the this keyword Since all members are added directly to the new object, use this function primarily for properties and add functions using props Methods could also be added to the prototype using thisprototypefunctionName reference, but that is not preferred This parameter is not required If the init parameter passed is not of type Function, it is treated as the prop parameter instead (the declare function rearranges the properties), and then prop is not required Why use init Use init to run some code when the object is created This is most like the constructor method in Java This function can also take parameters that would be passed into it when the constructor is called ie, new Customer( Tom , 100) would pass two parameters into init function When using init with superclasses, be sure and repeat the parameters for the superclass init function as the first parameters to the subclass init function
123 Defining a Class
Table 121 Parameter Name
props
Continued Parameter Data Type
Object or Array of Objects
Description and Usage of Parameter
Properties object An object (or array of objects) whose properties are copied to the created prototype The created object doesn t directly have these properties The properties are added to the instance of the object created Any functions are also added to the instance To add functions to the prototype, add the functions to the array superclass passed as the second parameter These are like the member declarations in Java Properties and methods are declared but not executed when the object is created A form of interfaces can be supported by adding properties for other object types here