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Advanced Examples of Classes with Inheritance and Encapsulation
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b.pedalRPM(50); System.out.println("Turning: " + b.getDegreeOfTurn()); System.out.println("Wheel RPM: " + b.getWheelRPM()); System.out.println("Creating a 10 speed bicycle..."); TenSpeedBicycle tb = new TenSpeedBicycle(); tb.setDegreeOfTurn(10); tb.setGearRatio(3f); tb.pedalRPM(40); System.out.println("Turning: " + tb.getDegreeOfTurn()); System.out.println("Wheel RPM: " + tb.getWheelRPM()); } }
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The preceding segment of code is the code that uses both classes. This code prints information to standard out for each step it takes. First, it creates a Bicycle object. It then sets the degree of turn to 0 and the pedal RPM to 50. The code then prints out the degree of turn, which will be 0, and the wheel RPM, which will be 100, since the gear ratio is 2 ( 2 * 50 ). Next, a TenSpeedBicycle object is created. This object has its degree of turn set to 10, its gear ratio set to 3 and its pedal RPM set to 40. Finally, this object prints out its degree of turn, which is 10, and its wheel RPM, which is 120 ( 3 * 40 ). Notice that the TenSpeedBicycle object s getDegreeOfTurn() and setDegreeOfTurn() were inherited from the base class Bicycle.
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Starting... Creating a bicycle... Turning: 0 Wheel RPM: 100.0 Creating a 10 speed bicycle... Turning: 10 Wheel RPM: 120.0
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This is the output of the program if it was compiled and run. This example shows most of the basic concepts of inheritance, as can be seen in Figure 7-3. As preparation for the SCJA exam, this should be reviewed until it is understood how the preceding output was generated.
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Examples of Inheritance with Abstract Classes
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This example will demonstrate an abstract class. An abstract class is a class in Java that cannot be instantiated. Another class must extend it. An abstract class may contain both concrete methods that have implementations, and abstract methods
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Understanding Class Inheritance
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Bicycle wheelRPM: float degreeOfTurn: int + + + + pedalRPM(float) : void setDegreeOfTurn(int) : void getWheelRPM() : float getDegreeOfTurn() : int
Basic inheritance
TenSpeedBicycle gearRatio: float = 2f wheelRPM: float + setGearRatio(float) : void + pedalRPM(float) : void + getWheelRPM() : float
that must be implemented by the subclass. This example creates a plant simulator. It has a Plant abstract class that is extended by a MapleTree class and Tulip class. The Plant class is a good abstract class because a plant is an abstract, or general, thing. Plants all share some characteristic that can be placed in this class. Each specific class can then contain the implementation details. The following code segment is the abstract Plant class:
public abstract class Plant { private int age=0; private int height=0; public int getAge() { return age; } public void addYearToAge() { age++; } public int getHeight() { return height; }
Advanced Examples of Classes with Inheritance and Encapsulation
public void setHeight(int height) { this.height = height; } abstract abstract abstract abstract } public public public public void void void void doSpring(); doSummer(); doFall(); doWinter();
The preceding abstract class is a very simplistic view of what represents a plant. It contains two instance variables that every type of plant would use: age and height. There is both a getter and setter for height, and a getter for age. The age instance variable has a method that is used to increment it each year. The Plant class has four abstract methods. Each of these methods represents the actions that a plant must take during the specified season. These actions are specific to the type of plant and therefore cannot be generalized. Having them declared in the abstract Plant class guarantees that they must be implemented by any class that extends the Plant class.
public class MapleTree extends Plant { private static final int AMOUNT_TO_GROW_IN_ONE_GROWING_SEASON = 2; // A tree grows upwards a certain number of feet a year. // A tree does not die down to ground level during the winter. private void grow() { int currentHeight = getHeight(); setHeight(currentHeight + AMOUNT_TO_GROW_IN_ONE_GROWING_SEASON); } public void doSpring() { grow(); addYearToAge(); System.out.println("Spring: The maple tree is starting to grow " + "leaves and new branches"); System.out.println("\tCurrent Age: " + getAge() + " " + "Current Height: " + getHeight()); } public void doSummer() { grow(); System.out.println("Summer: The maple tree is continuing to grow");
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