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POHow to extend or implement classes?
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copied!<p>Picture to show task: <img src="https://i.stack.imgur.com/2s38M.png" alt="enter image description here"></p> <p>First I am sorry, for my bad to for expressing my mind.</p> <p>I have such a task, I don't need that you do it for me.</p> <p><code>Vehicle</code> is parent class for <code>Sedan</code> (Cause Sedan class is String type).</p> <ol> <li>How to extend or implement Vehicle class with universal class?</li> <li>I forgot to ask my teacher, but maybe you will know, what means striped pointer to Owner class, and what is that: <code>has a</code>?</li> </ol> <p>P.S. If you need code that I have written already, I will show you.</p> <p>So this is my parent Vehicle class:</p> <pre><code>public class Vehicle { private int vehicleNumber; protected int fuelTankSize; protected int maxSpeed; protected Owner owner; //1 public Vehicle(int vehicleNumber){ this.vehicleNumber = vehicleNumber; } //2 public Vehicle(int vehicleNumber, int fuelTankSize) { this.vehicleNumber = vehicleNumber; this.fuelTankSize = fuelTankSize; } //3 public Vehicle(int vehicleNumber, int fuelTankSize, int maxSpeed) { this.vehicleNumber = vehicleNumber; this.fuelTankSize = fuelTankSize; this.maxSpeed = maxSpeed; } //4 public Vehicle(int vehicleNumber, int fuelTankSize, int maxSpeed, Owner owner) { this.vehicleNumber = vehicleNumber; this.fuelTankSize = fuelTankSize; this.maxSpeed = maxSpeed; this.owner = owner; } //1 public int getMaxSpeed() { return maxSpeed; } public void setMaxSpeed (int maxSpeed){ this.maxSpeed = maxSpeed; } //2 protected int getFuelTankSize(){ return fuelTankSize; } protected void setFuelTankSize (int fuelTankSize){ this.fuelTankSize = fuelTankSize; } //3 public Owner getOwner(){ return owner; } public void setOwner (Owner owner){ this.owner = owner; } } </code></pre> <p>child Sedan with:</p> <pre><code>public class Sedan extends Vehicle { private String registrationIndex;{ } public Sedan (int vehicleNumber, int fuelTankSize, int maxSpeed, String registrationIndex, Owner owner) { super(vehicleNumber, fuelTankSize, maxSpeed, owner); this.setRegistrationIndex (registrationIndex); } public String getRegistrationIndex (){ return registrationIndex; } public void setRegistrationIndex (String registrationIndex) { this.registrationIndex = registrationIndex; } } </code></pre> <p>second Universal child without an error:</p> <pre><code>public class Universal extends Vehicle { private int trunkSize; public Universal (int vehicleNumber, int fuelTankSize, int maxSpeed, int trunkSize, Owner owner) { super(vehicleNumber, fuelTankSize, maxSpeed, owner); this.setTrunkSize (trunkSize); } public int getTrunkSize() { return trunkSize; } public void setTrunkSize(int trunkSize) { this.trunkSize = trunkSize; } public void printDescription() { super.printDescription(); System.out.println("Universalo bagažinės tūris: " + getTrunkSize() + "l."); } } </code></pre> <p>and some misterious (to me) Owner class:</p> <pre><code>public class Owner { public String firstName; public String lastName; public Owner (String firstName){ this.firstName = firstName; } public Owner (String firstName, String lastName){ this.firstName = firstName; this.lastName = lastName; } } </code></pre> <p>added VechileTest for testing:</p> <pre><code>public class VehicleTest { public static void main(String[] args) { Vehicle vehicleInf = new Vehicle (1, 45, 260); Universal universalInf = new Universal(2, 50, 220, 70); Sedan sedanInf = new Sedan (3, 40, 180, "AVA 123"); vehicleInf.printDescription(); universalInf.printDescription(); sedanInf.printDescription(); } } </code></pre>

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