vb.net print barcode zebra OBJECT-ORIENTED PROGRAMMING in Java

Create Data Matrix 2d barcode in Java OBJECT-ORIENTED PROGRAMMING

OBJECT-ORIENTED PROGRAMMING
Data Matrix 2d Barcode Reader In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
Data Matrix ECC200 Drawer In Java
Using Barcode creator for Java Control to generate, create Data Matrix image in Java applications.
[CHAP. 1
ECC200 Recognizer In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
Barcode Drawer In Java
Using Barcode drawer for Java Control to generate, create bar code image in Java applications.
The program tests the Ratio class:
Bar Code Decoder In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
ECC200 Encoder In C#.NET
Using Barcode drawer for .NET framework Control to generate, create Data Matrix ECC200 image in Visual Studio .NET applications.
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Data Matrix 2d Barcode Creation In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create ECC200 image in ASP.NET applications.
Data Matrix ECC200 Creation In VS .NET
Using Barcode creator for Visual Studio .NET Control to generate, create Data Matrix ECC200 image in .NET applications.
public class TestRatio { public static void main(String[] args) { System.out.println("Ratio.ZERO = " + Ratio.ZERO); System.out.println("Ratio.ZERO.value() = " + Ratio.ZERO.value()); Ratio x = new Ratio(22, 7); System.out.println("x = " + x); System.out.println("x.value() = " + x.value()); System.out.println("x.equals(Ratio.ZERO): " + x.equals(Ratio.ZERO)); Ratio xx = new Ratio(44, 14); System.out.println("xx = " + xx); System.out.println("xx.value() = " + xx.value()); System.out.println("x.equals(xx): " + x.equals(xx)); } }
Make Data Matrix 2d Barcode In VB.NET
Using Barcode creation for .NET Control to generate, create Data Matrix image in .NET applications.
Code 3/9 Creation In Java
Using Barcode generator for Java Control to generate, create Code 3/9 image in Java applications.
The output is:
Create Code 128B In Java
Using Barcode creation for Java Control to generate, create ANSI/AIM Code 128 image in Java applications.
EAN / UCC - 13 Maker In Java
Using Barcode generator for Java Control to generate, create EAN 13 image in Java applications.
Ratio.ZERO = 0/1 Ratio.ZERO.value() = 0.0 x = 22/7 x.value() = 3.142857142857143 x.equals(Ratio.ZERO): false xx = 44/14 xx.value() = 3.142857142857143 x.equals(xx): true
ISBN Encoder In Java
Using Barcode maker for Java Control to generate, create ISBN - 13 image in Java applications.
Bar Code Maker In VS .NET
Using Barcode creator for Reporting Service Control to generate, create barcode image in Reporting Service applications.
The Ratio class in Example 1.5 is immutable: its fields cannot be changed. MODIFIERS Modifiers are used in the declaration of class members and local variables. These are summarized in the following tables.
UPC Code Maker In C#
Using Barcode creation for .NET Control to generate, create UPC-A image in VS .NET applications.
Decoding Code 39 Extended In VB.NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in .NET applications.
Modifier
GS1 128 Creator In C#
Using Barcode creation for Visual Studio .NET Control to generate, create EAN / UCC - 14 image in Visual Studio .NET applications.
EAN13 Drawer In Java
Using Barcode maker for Eclipse BIRT Control to generate, create EAN-13 Supplement 5 image in Eclipse BIRT applications.
abstract final public strictfp
UCC.EAN - 128 Generation In Objective-C
Using Barcode maker for iPhone Control to generate, create EAN 128 image in iPhone applications.
Decoding Barcode In VS .NET
Using Barcode Control SDK for ASP.NET Control to generate, create, read, scan barcode image in ASP.NET applications.
Meaning
The class cannot be instantiated. The class cannot be extended. Its members can be accessed from any other class. Floating-point results will be platform-independent. Table 1.1 Modifiers for classes, interfaces, and enums
Modifier
private protected public
Meaning
It is accessible only from within its own class. It is accessible only from within its own class and its extensions. It is accessible from all classes. Table 1.2 Constructor modifiers
CHAP. 1]
OBJECT-ORIENTED PROGRAMMING
Modifier
final private protected public static transient volatile
Meaning
It must be initialized and cannot be changed. It is accessible only from within its own class. It is accessible only from within its own class and its extensions. It is accessible from all classes. The same storage is used for all instances of the class. It is not part of the persistent state of an object. It may be modified by asynchronous threads. Table 1.3 Field modifiers
Modifier
abstract final native private protected public static strictfp synchronized volatile
Meaning
Its body is absent; to be defined in a subclass. It cannot be overridden in class extensions. Its body is implemented in another programming language. It is accessible only from within its own class. It is accessible only from within its own class and its extensions. It is accessible from all classes. It has no implicit argument. Its floating-point results will be platform-independent. It must be locked before it can be invoked by a thread. It may be modified by asynchronous threads. Table 1.4 Method modifiers
Modifier
final
Meaning
It must be initialized and cannot be changed. Table 1.5 Local variable modifier
The three access modifiers, public, protected, and private, are used to specify where the declared member (class, field, constructor, or method) can be used. If none of these is specified, then the entity has package access, which means that it can be accessed from any class in the same package. The modifier final has three different meanings, depending upon which kind of entity it modifies. If it modifies a class, final means that the class cannot be extended to a subclass. (See 9.) If it modifies a field or a local variable, it means that the variable must be initialized and cannot be changed, that is, it is a constant. If it modifies a method, it means that the method cannot be overridden in any subclass. The modifier static means that the member can be accessed only as an agent of the class itself, as opposed to being bound to a specific object instantiated from the class. For example, the format() method, invoked at line 34 in the Line class in Example 1.5 on page 6 is a static method:
return String.format("%d/%d", num, den);
OBJECT-ORIENTED PROGRAMMING
[CHAP. 1
It is bound to the String class itself, accessed as String.format(). On the other hand, the value() method, invoked at line 7 in the test program is a nonstatic method. It is bound to the object x, an instance of the Ratio class, and is accessed x.value(). A static method is also called a class method; a nonstatic method is also called an instance method. The object to which an instance method is bound in an invocation is called its implicit argument for that invocation. For example, the implicit argument in the invocation x.equals(xx) is the object x. (xx is the explicit argument.) Note that every program s main() method is a static method. COMPOSITION, AGGREGATION, AND INHERITANCE There are several different ways to associate one class with another: composition, aggregation, and inheritance. When a class A contains references to instances of a class B and controls all access to those instances, we say that A is a composition of B. For example, a University class would be a composition of Department objects. Each Department object belongs to a unique University object, which controls access to its department. If A is a composition of B, we say that an A object owns a B object. For example, a university owns a department. When a class A contains references to a class B whose instances exist and are accessible outside of A, we say that A is an aggregation of B. For example, in a university software system, a Department class would contain references to Professor objects who are members of the department, but who also exist outside the department. In fact, a professor could be a member of two different departments. If A is an aggregation of B, we say that an A object has a B object. For example, a department has a professor. When a class A includes all the members of a class B, we say that A is an extension of B, and that it inherits all the properties of B. For example, a Professor class would be an extension of a Person objects. If A is an extension of B, we say that an A object is a B object. For example, a professor is a person. Figure 1.6 illustrates how these three class associations are represented in UML. Composition is indicated by a filled diamond head adjacent to the composing class, aggregation is indicated by an empty diamond head adjacent to the aggregating class, and inheritance is indicated by an empty arrow head adjacent to the extended class. EXAMPLE 1.6 Implementing Associations
1 2 3 4 5 6
public class Person { private final String name; public Person(String name) { this.name = new String(name); }
Copyright © OnBarcode.com . All rights reserved.