how to generate barcode in vb.net 2008 One-to-Many Class Association in Java

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One-to-Many Class Association
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The next example will demonstrate an aggregation association. This example will have a relationship that is one-to-many. Wheel objects will be part-of a Car object.
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public class Car { Wheel[] wheel = new Wheel[4]; void setWheels(Wheel w) { wheel[0] = w; wheel[1] = w; wheel[2] = w; wheel[3] = w; } // Remainder of Car class would be here }
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This example has an array of four Wheel objects. Since there is one Car object that contains four Wheel objects, this relationship is one-to-many. With a oneto-many relationship the multiple objects will normally be stored in an array or collection such as a Vector. This example is an aggregation association since the Wheel object is part-of the Car object. Because this is a weak relationship and there are no life cycle responsibilities, this can be generalized as an association.
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Many-to-Many Class Association
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The many-to-many relationship is more complex than the previous one-to-one and one-to-many relationships. This relationship is between a group of Car objects
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Working with Classes and Their Relationships
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and a group of TrafficLight objects. The following is the code segment for the two objects:
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// TrafficLight class public class TrafficLight { int lightID; TrafficLight(int ID) { lightID = ID; } } // Car class public class Car { TrafficLight[] allTrafficLights; Car(TrafficLight[] trafficLights) { allTrafficLights=trafficLights; } }
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This next segment is the code that creates both objects. This segment is important because it shows how the relationships are formed between the objects.
public class TrafficSimulator { Car[] cars = new Car[3]; TrafficLight[] trafficLights = new TrafficLight[8]; public static void main(String[] args) { new TrafficSimulator(); } TrafficSimulator() { for (int i = 0; i < trafficLights.length; i++) { trafficLights[i] = new TrafficLight(i); } cars[0] = new Car(trafficLights); cars[1] = new Car(trafficLights); cars[2] = new Car(trafficLights); } }
This segment contains a main method. The sole job of main is to create a new TrafficSimulator object. The TrafficSimulator object contains an array of Car objects and an array of TrafficLight objects. First, the TrafficLight
Class Compositions and Associations in Practice
objects are created. Each TrafficLight object stores a unique ID. Next, the Car objects are created. Each Car object contains an array of all the TrafficLight objects. This example is many-to-many because each Car object contains the same group of multiple TrafficLight objects. This relationship can be classified as a direct association because the Car objects has-an array of TrafficLight objects.
An array or collection should be a dead giveaway that you are looking at a *-to-many relationship. If there is only one object and an array or collection, it will be a one-to-many relationship. If there are two arrays or collections with references to each other, it will be a many-to-many relationship.
Examples of Class Composition Relationships
This section will be similar to the last section except that composition associations will be demonstrated. Composition associations only have two possible multiplicities. This section will have an example of each followed by an explanation.
One-to-One Class Composition
This example will demonstrate a one-to-one composition relationship. This will be a composition association since that is the only type of association that can create a composition relationship.
public class Tire { TireAirPressure tireAirPressure; Tire(){ tireAirPressure = new TireAirPressure(); } }
In the preceding example, the Tire object and the TireAirPressure object have a one-to-one relationship. The Tire object is composed-of the TireAirPressure object. This represents a composition association. The relationship between the
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Working with Classes and Their Relationships
two objects is strong. The Tire object has life cycle management responsibilities to the TireAirPressure object. If the Tire object was destroyed, the TireAirPressure object would also be destroyed.
One-to-Many Class Composition
This final example will demonstrate a composition relationship with a one-to-many multiplicity. The following code segment is of a SensorStatus class:
public class SensorStatus { int status; public SensorStatus(int newStatus) { status = newStatus; } }
The next segment demonstrates a CarComputer object that is composed-of an array of five SensorStatus objects.
public class CarComputer { SensorStatus[] sensorStatus = new SensorStatus[5]; public CarComputer() { sensorStatus[0] = new SensorStatus(1); sensorStatus[1] = new SensorStatus(1); sensorStatus[2] = new SensorStatus(1); sensorStatus[3] = new SensorStatus(1); sensorStatus[4] = new SensorStatus(1); } }
Since there is one CarComputer object and five SensorStatus objects, this represents a one-to-many relationship. The relationship is composition association. Again, notice how the relationship is strong, and that the SensorStatus array depends on the CarComputer object to manage its life cycle.
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