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Exam Objective 3.2 Develop code that declares concrete classes, abstract classes, and interfaces, code that supports implementation and interface inheritance, code that declares instance attributes and methods, and code that uses the Java access modifiers: private and public. This section will conclude the chapter by revisiting all of the concepts that have been discussed and demonstrating them with code examples. Each example will be followed by a detailed explanation of what is being highlighted and how it works. Pay close attention to the examples. They should help reinforce all of the concepts already covered.
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The following example is a class implemented with its implementation details hidden. It uses public methods to expose an interface, as well as getters and setters to allow access to its instance variables.
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public class PhoneBookEntry { private String name = ""; private int phoneNumber = 0; private long lastUpdate = 0; public String getName() { return name; } public void setNameNumber(String name,int phoneNumber) { this.name = name; this.phoneNumber = phoneNumber; lastUpdate = System.currentTimeMillis(); } public int getPhoneNumber() { return phoneNumber; } public void setPhoneNumber(int phoneNumber) { this.phoneNumber = phoneNumber; lastUpdate = System.currentTimeMillis(); } }
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The preceding example is a well-encapsulated class. It is a class that represents a basic phone book entry. It can store a name and a phone number. It also uses an instance variable to track the last time it was updated. All of the instance variables use the private access modifier. This means external classes are unable to read or modify them. It then uses getters and setters to modify the instance variables. In the preceding example, there is no setter to set the name instance variable. To set the name instance variable, the object must also set the phoneNumber variable. This ensures there is never a name without a phone number. If the instance variables were public, this class could not prevent another class from only setting a name without a number.
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This example also uses its setters to update the lastUpdate variable. This variable is used to track the last time this class had its information updated. By using the getters and setters, the class can guarantee that any time an external object updates a field via a setter, the lastUpdate variable will also be updated. The details of how lastUpdate becomes updated are invisible to external objects.
Examples of Inheritance with Concrete Classes
A concrete class is the standard Java class. All of its methods are implemented and it can be instantiated. The following example is of a Bicycle class. The base class represents a basic bicycle. Another class represents a ten-speed bicycle. It is called TenSpeedBicycle and extends the Bicycle class. The TenSpeedBicycle class is able to inherit some of its functionality while overriding the parts of the base class that need to behave differently. The TenSpeedBicycle class has the ability to change its gear ratio in addition to what the Bicycle class can do.
public class Bicycle { private float wheelRPM; private int degreeOfTurn; public void pedalRPM(float pedalRPM){ float gearRatio = 2f; this.wheelRPM = pedalRPM * gearRatio; } public void setDegreeOfTurn(int degreeOfTurn){ this.degreeOfTurn = degreeOfTurn; } public float getWheelRPM() { return this.wheelRPM; } public int getDegreeOfTurn() { return this.degreeOfTurn; } }
The preceding is the Bicycle class. This is a concrete class and therefore can be instantiated. This class represents a basic bicycle. It has two instance variables,
7:
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wheelRPM, which is used to store the RPM of the wheels, and degreeOfTurn,
which is used to store the degree the handlebars are turned. Each variable has a getter, and degreeOfTurn has a setter. The wheelRPM variable is set with the method pedalRPM(float pedalRPM). This accepts an argument that contains the RPM of the pedals, and then multiplies that by a set gear ratio to find and set the wheelRPM variable.
public class TenSpeedBicycle extends Bicycle { private float gearRatio = 2f; private float wheelRPM; public void setGearRatio(float gearRatio) { this.gearRatio = gearRatio; } public void pedalRPM(float pedalRPM) { this.wheelRPM = pedalRPM * gearRatio; } public float getWheelRPM() { return this.wheelRPM; } }
The TenSpeedBicycle class, listed in the preceding example, extends the Bicycle class. This class represents a bicycle that has ten different possible gear ratios. The regular Bicycle class cannot be used because it has a fixed gear ratio. The TenSpeedBicycle class adds a method and instance variable so a gear ratio can be set. It also overrides the wheelRPM variable. This must be done because the Bicycle class has no setter to set that variable directly. The TenSpeedBicycle class also overrides the pedalRPM(float pedalRPM) method. In the Bicycle class version of this method, the gear ratio was fixed. In the newer version, it uses the gear ratio that can be set. To retrieve the wheelRPM variable, the getter must also be overridden. This is because the original version of this method can only return the instance variable that is in its same class.
public class Main { public static void main(String[] args) { System.out.println("Starting..."); System.out.println("Creating a bicycle..."); Bicycle b = new Bicycle(); b.setDegreeOfTurn(0);
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