Question

Programmed in Java, please use inheritance, as that is the part i'm confused on. Thanks!

For this lab you are creating 4 classes:

1. Main class

Has the main method and tests the other classes.

2. Computer
   1. We are storing the following information about our computers
      1. CPU type
      2. CPU speed
      3. RAM size
3. Laptop
   1. We are storing the following information about our laptops
      1. All the information we have in the computer
      2. Battery life in hours
      3. The current battery level (hours remaining).
   2. Charge method that sets the battery level to the max level.
4. Desktop
   1. We are storing the following information about our laptops
      1. All the information we have in the computer
      2. Number of screens

Write the appropriate constructors, getters and setters in each class.

In your main class create a laptop with an I7 10 generation 3.5 GHZ CPU, 16 GB of RAM and a battery that lasts 10 hours.

You will also need to create a Desktop with the same specs that has 2 screens.

Use the toString method to print the details for your laptop and desktop.

Answer 1

Computer.java

======================

package computer;

public class Computer {
   // Parent class
   // other class derived from this class
  
   // data members
   private String CPU_type; // type of CPU
   private double CPU_speed; // CPU speed in GHZ
   private int RAM_size; // size of RAM in GB
  
   // default constructor
   public Computer() {
       // initialize data members
       CPU_type = "";
       CPU_speed = 0;
       RAM_size = 0;
   }
  
   // constructor with parameters
   public Computer(String CPU_type, double CPU_speed, int RAM_size) {
       // initialize data members
       // this indicates current instance of class,
       // it is used to make parameter name distinguish from member data names
       this.CPU_type = CPU_type;
       this.CPU_speed = CPU_speed;
       this.RAM_size = RAM_size;
   }

   // getters
   public String getCPUType() {
       return CPU_type;
   }
  
   public double getCPUSpeed() {
       return CPU_speed;
   }
  
   public int getRAMSize() {
       return RAM_size;
   }
  
   // setters
   public void getCPUType(String CPU_type) {
       this.CPU_type = CPU_type;
   }
  
   public void getCPUSpeed(double CPU_speed) {
       this.CPU_speed = CPU_speed;
   }
  
   public void getRAMSize(int RAM_Size) {
       this.RAM_size = RAM_Size;
   }
  
   // returns all data members in string form
   public String toString() {
       String str = "CPU Type: " + CPU_type + "\nCPU Speed: " + CPU_speed + " GHZ\nRAM Size: " + RAM_size + " GB\n";
       return str;
   }
}

=============================

Laptop.java

=============================

package computer;

public class Laptop extends Computer{
   // child class of Computer class
  
   // data members
   private int batteryLife; // Battery life in hours
   private int batteryLevel; // The current battery level (hours remaining)

   // default constructor
   public Laptop() {
       super();
       batteryLife = 0;
       batteryLevel = batteryLife;
   }
  
   // constructor with parameters
   public Laptop(String CPU_type, double CPU_speed, int RAM_size, int batteryLife) {
       // initialize data members
       // call to parent class constructor to initialize its data
       super(CPU_type, CPU_speed, RAM_size);
       this.batteryLife = batteryLife;
       batteryLevel = batteryLife; // Laptops sold are fully charged
   }
  
   // getters
   public int getBatteryLife() {
       return batteryLife;
   }
  
   public int getBatteryLevel() {
       return batteryLevel;
   }

   // setters
   public void setBatteryLife(int batteryLife) {
       this.batteryLife = batteryLife;
   }
  
   public void setBatteryLevel(int batteryLevel) {
       this.batteryLevel = batteryLevel;
   }
  
   // sets the battery level to the max level
   public void charge() {
       setBatteryLevel(batteryLife);
   }
  
   // returns all data members in string form
   public String toString() {
       String str = "Laptop: \n" + super.toString() // call to parent class's to string method to print its data first
           + "Battery Life: " + batteryLife + " Hrs\n" + "Current Bettery Level: " + batteryLevel + " Hrs\n";
       return str;
   }
}

=================================

Desktop.java

=================================

package computer;

public class Desktop extends Computer{
   // child class of Computer class
  
   // data members
   private int screens; // Number of screens
  
   // default constructor
   public Desktop() {
       super();
       screens = 0;
   }
  
   // constructor with parameters
   public Desktop(String CPU_type, double CPU_speed, int RAM_size, int screens) {
       // initialize data members
       // call to parent class constructor to initialize its data
       super(CPU_type, CPU_speed, RAM_size);
       this.screens = screens;
   }
  
   // getters
   public int getScreens() {
       return screens;
   }
  
   // setters
   public void setScreens(int screens) {
       this.screens = screens;
   }
  
   // returns all data members in string form
   public String toString() {
       String str = "Desktop: \n" + super.toString() // call to parent class's to string method to print its data first
           + "Number of Screens: " + screens + "\n";
       return str;
   }
  
}

=========================

Tester.java

=========================

package computer;

public class Tester {
  
   // main method to run the program
   public static void main(String[] args) {
       // create a laptop with an I7 10 generation 3.5 GHZ CPU, 16 GB of RAM and a battery that lasts 10 hours
       Laptop laptop = new Laptop("I7 10 generation", 3.5, 16, 10);
      
       // create a Desktop with the same specs that has 2 screens
       Desktop desktop = new Desktop("I7 10 generation", 3.5, 16, 2);
      
       // print the details for laptop and desktop
       System.out.println(laptop);
       System.out.println(); // print empty line
      
       System.out.println(desktop);
   }

}

let me know if you have any problem or doubts. thank you.