Question

JAVA PROGRAM:

INCLUDE COMMENTS EXPLAINING THE CODE PLEASE

Given the following information:

• 13-inch MacBook Air, 1.6GHz dual-core Intel Core i5 processor, Turbo Boost up to 2.7GHz, Intel HD Graphics 6000, 8GB memory, 128GB PCIe-based flash storage
• 13-inch MacBook Air, 1.6GHz dual-core Intel Core i5 processor, Turbo Boost up to 2.7GHz, Intel HD Graphics 6000, 8GB memory, 256GB PCIe-based flash storage
• 15.6-inch Dell i3552, 1.6GHz Processor, Intel Pentium N3700, HD Laptop, 4 GB memory, DDR3L SDRAM, Windows 10, Black

Drive 3 classes; class Computer (a super class), class Apple and class Others (subclasses). Your classes should have whatever variables you think needed to reflect the given information, think carefully what is needed to be assigned to the super class and what should be assigned to the sub classes.

Answer 1

We have one superclass Computer and two subclasses, Apple and Others. If we look at the given specification of the laptops, we notice 4 attributes that are common in both Apple and non-Apple laptops, so we keep those 4 attributes in Computer class. The non-common attributes will be kept in their corresponding specific classes. Below is the rough model of all the items and their class types.

Computer
=============
modelName
screenSize
processorSpeed
ramSize

Apple
=============
flashStorageSize
graphicsCard
turboBoostLimit
numberOfCores
processorGeneration

Others
=============
processorModel
isHd
ramType
operatingSystem
color

The code is divided in three separate files Computer.java, Apple.java, and Others.java. Each of the files has inline comments to explain the thought process and logic. I am pasting the code right below followed by the IDE screenshot of the same code and execution outputs.

Computer.java

package myStore;

/*
* The parent(super) class Computer
*/
public class Computer {
   /*
   * Computer has below 4 parameters common in
   * both Apple and non-Apple laptops
   * Hence, we will keep them in this class
   * and will re-use them in the subclasses
       =============
       modelName
       screenSize
       processorSpeed
       ramSize
      
   */

   protected String modelName; // MacBook Air or Dell i3552
   protected double screenSize;   // inches can be non-integer, so take it as double
   protected double processorSpeed;// Again it's a double value, 1.66GHz etc
   protected int ramSize; // It's an integer always, 4/8/16 GB etc.
  
   // Define a parameterized constructor, this will help the
   // object formation of subclasses Apple and Others
   public Computer(String model, double size, double speed, int ram) {
       this.modelName = model;
       this.screenSize = size;
       this.processorSpeed = speed;
       this.ramSize = ram;
   }
}

Apple.java

package myStore;

/*
* The subclass Apple which will inherit all
* the properties of superclass Computer,
* namely
*        modelName
       screenSize
       processorSpeed
       ramSize
* Apart from these, it has its own attributes
*/
public class Apple extends Computer {

   /*
   *
       Apple laptop specific attributes(which are not
       present in Other laptops)
       =============
       numberOfCores
       processorGeneration
       graphicsCard
       turboBoostLimit      
       flashStorageSize
   */
  
   private int flashStorageSize;       //Flash size in int, like 128GB etc
   private String graphicsCard;       //String like Intel HD Graphics 6k
   private double turboBoostLimit;       // It's a double, like 2.7GHz
   private int numberOfCores;           // if dual-core then 2, quad-core = 4
   private String processorGeneration;   // Core i5 ,i3 or i7
  
   /*
   * Apple constructor which takes the inherited attributes as well as
   * its own attributes to initialize an object of class "Apple"
   * First 4 parameters are coming from the superclass "Computer",
   * while rest are Apple specific parameters
   */
   private Apple(String model, double size, double speed, int ram,
               int flash, String graphics, double turbo,
               int cores, String generation) {
       // invoke the superClass constructor (Computer's)
       super(model, size, speed, ram);
       // Assign rest of Apple specific attributes
       this.flashStorageSize = flash;
       this.graphicsCard = graphics;
       this.turboBoostLimit = turbo;
       this.numberOfCores = cores;
       this.processorGeneration = generation;
   }

   public static void main(String args[]) {
       /*
       * Create an Apple-laptop object with all the necessary parameters, name it ap,
       * use ap to print the Apple-laptop's specifications in a formatted output
       *
       * 13-inch MacBook Air, 1.6GHz dual-core Intel Core i5 processor,
       * Turbo Boost up to 2.7GHz, Intel HD Graphics 6000, 8GB memory,
       * 128GB PCIe-based flash storage
       */
       Apple ap = new Apple("MacBook Air", 13, 1.66, 8, 128, "Intel HD Graphics 6000", 2.7, 2, "Intel Core i5");
       System.out.println("------- Details of an Apple laptop --------\n"
               + "Model: " + ap.modelName
               + "\nScreen: " + ap.screenSize + " inches"
               + "\nProcessor Speed: " + ap.processorSpeed + " GHz"
               + "\nProcessor Type: " + ap.processorGeneration
               + "\nCores: " + ap.numberOfCores
               + "\nTurboBoost up to: " + ap.turboBoostLimit + " GHz"
               + "\nGraphics: " + ap.graphicsCard
               + "\nRAM: " + ap.ramSize + " GB"
               + "\nFlash: " + ap.flashStorageSize + " GB");
      
   }

}

Others.java

package myStore;
/*
* The subclass Others which will inherit all
* the properties of superclass Computer,
* namely
*        modelName
       screenSize
       processorSpeed
       ramSize
* Apart from these, it has its own attributes
* different from Apple class' attributes
*/
public class Others extends Computer{
   /*
   *
       Others laptop specific attributes(which are not
       present in Apple laptops)
       =============
       processorModel
       isHd
       ramType
       opeatingSystem
       color
   */
   private String processorModel;   // the brand model name as string
   private boolean isHd;           // boolean(if HD or not, true/false?)
   private String ramType;           // DDR or SDR
   private String operatingSystem;   // Windows, Linux, FreeDOS?
   private String color;           // Color of the laptop
   /*
   * Others constructor which takes the inherited attributes as well as
   * its own attributes to initialize an object of class "Others"
   * First 4 parameters are coming from the superclass "Computer",
   * while rest are Others specific parameters
   */
   private Others(String model, double size, double speed, int ram,
           String processor, boolean hd, String ramtype,
           String os, String color) {
      
       // invoke the superClass constructor (Computer's)
       super(model, size, speed, ram);
       // Assign rest of Others' specific attributes
       this.processorModel = processor;
       this.isHd = hd;
       this.ramType = ramtype;
       this.operatingSystem = os;
       this.color = color;
   }

   public static void main(String[] args) {
       /*
       * Create an Other-laptop object with all the necessary parameters,
       * name it ot, use ot to print the Other-laptop's specifications
       * in a formatted output
       *
       * 15.6-inch Dell i3552, 1.6GHz Processor, Intel Pentium N3700,
       * HD Laptop, 4 GB memory, DDR3L SDRAM, Windows 10, Black
       */

       Others ot = new Others("Dell i3552", 15.6, 1.66, 4,
                   "Pentium N3700", true, "DDR3L", "Windows 10", "Black");
       System.out.println("------- Details of a non-Apple laptop --------\n"
               + "Model: " + ot.modelName
               + "\nScreen: " + ot.screenSize + " inches"
               + "\nProcessor Speed: " + ot.processorSpeed + " GHz"
               + "\nProcessor Type: " + ot.processorModel
               + "\nHD(?): " + ot.isHd
               + "\nRAM : " + ot.ramSize + "GB " + ot.ramType
               + "\nOS: " + ot.operatingSystem
               + "\nColor: " + ot.color);
   }

}

Computer.java

Apple.java

Others.java

Execution screenshots:

Let me know if you have any further queries and I will be glad to assist. Thanks for asking :)