Here are the source codes for each class if this exercise :
Class 1 Source Code
//Joel Pena
//Section: W380
//10/20/2018
public class MobileDevice {
private String deviceType;
public MobileDevice(){
deviceType= “Mobile Device”;
}
public void setDeviceType(){
return;
}
public String getDeviceType(){
return deviceType;
}
}
Class 2 Source Code
//Joel Pena
//Section: W380
//10/20/2018
public class SmartPhone extends MobileDevice{
private String deviceType;
public SmartPhone(){
deviceType= “Smart Phone”;
setDeviceType();
}
public String getDeviceType(){
deviceType= super.getDeviceType() + “–>”+ deviceType;
return deviceType;
}
}
Class 3 Source Code
Â
//Joel Pena
//Section: W380
//10/20/2018
public class IPhone extends SmartPhone {
private String deviceType;
public IPhone(){
deviceType= “iphone”;
setDeviceType();
}
public String getDeviceType(){
deviceType= super.getDeviceType() + “—>”+ deviceType;
return deviceType;
}
}
Class 4 Source Code
//Joel Pena
//Section: W380
//10/20/2018
public class Android extends SmartPhone {
private String deviceType;
public Android(){
deviceType= “Android”;
setDeviceType();
}
public String getDeviceType(){
deviceType= super.getDeviceType() + “–>”+deviceType;
return deviceType;
}
}
Â
Class 5 Source Code
//Joel Pena
//Section: W380
//10/20/2018
public class WindowsPhone extends SmartPhone {
privateString deviceType;
public WindowsPhone(){
deviceType= “Windows Phone”;
setDeviceType();
}
public String getDeviceType(){
deviceType= super.getDeviceType() + “–>”+ deviceType;
return deviceType;
}
}
Description: What I have done is I created a inheritance hierachy of mobile devices. The first class I created for my hierachy is named MobileDevice. Inside of the class I added a private field named deviceType which is initialized to the string âMobile Deviceâ inside the constructor that I created for the class along with a set and get method. Then I created a second class named SmartPhone That Inherits the methods from the MobileDevice class which is the superclass of the class SmartPhone by using the âextendsâ command and adding the class that will be extended (MobileDevice class) as shown above. I added the private field deviceType and assigned it to the string âSmart Phoneâ. I used the setDeviceType() method of the MobileDevice class to set the device type of the new class.  I overrided the get method of the MobileDevice class inside of the SmartPhone class by giving the deviceType field a new assignment and inside that assignment I accessed  the method of the super class to get the device type of the super class by using âsuper.getDeviceType()â . getDeviceType() is the name of the method and added the new deviceType field which is âSmart Phoneâ. After overriding the getDeviceType() method inside the SmartPhone class I created three more classes named IPhone , Android and WindowsPhone. In each class I used the SmartPhone class as the superclass. Each containing the deviceType field to assign the new device type. In each class I used the set and get methods of the SmartPhone super class which is the same methods as the MobileDevice classand overrided the get method of the SmartPhone class to print the superclass device type and the new device type.
After creating all classes I ran the following client code and got the following output:
public classMobileDeviceClient {
public static void main(String[] args) {
// TODOÂ Auto-generated method stub
MobileDevice myMobileDevice = new MobileDevice();
SmartPhone mySmartPhone = new SmartPhone();
IPhone myiPhone = new IPhone();
Android myAndroid = new Android();
WindowsPhone myWindowsPhone = new WindowsPhone();
System.out.println(myMobileDevice.getDeviceType());
System.out.println(mySmartPhone.getDeviceType());
System.out.println(myiPhone.getDeviceType());
System.out.println(myAndroid.getDeviceType());
System.out.println(myWindowsPhone.getDeviceType());
}
}
Output
Â
Mobile Device Inheritance Hierachy
Â
Â
