This computer science problem involves algorithmic thinking and programming concepts. The solution below explains the approach, logic, and implementation step by step.
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Here are the solutions for the quiz questions in Java: --- 7) Laptop Tracking System Step 1: Define the StockInfo interface. This interface declares a method for displaying stock information. `java // StockInfo.java public interface StockInfo void displayStockDetails(); ` Step 2: Design the Laptop class. This class encapsulates attributes, includes a static variable for counting, and implements the StockInfo interface. `java // Laptop.java public class Laptop implements StockInfo private String brand; private int ramSizeGB; private double price; private static int totalLaptopsCreated = 0; // Static variable to count laptops // Constructor public Laptop(String brand, int ramSizeGB, double price) this.brand = brand; this.ramSizeGB = ramSizeGB; this.price = price; totalLaptopsCreated++; // Increment count when a new laptop is created // Implement the interface method @Override public void displayStockDetails() System.out.println("Brand: " + brand); System.out.println("RAM Size: " + ramSizeGB + "GB"); System.out.println("Price: " + String.format("%.2f", price)); // Static method to get the total number of laptops public static int getTotalLaptopsCreated() return totalLaptopsCreated; ` Step 3: Create Main class to test. This class creates three Laptop objects and displays the total count. `java // Main.java public class Main public static void main(String[] args) // Create three laptop objects Laptop laptop1 = new Laptop("Dell", 16, 1200.50); Laptop laptop2 = new Laptop("HP", 8, 850.00); Laptop laptop3 = new Laptop("Apple", 16, 1800.75); System.out.println("--- Laptop Details ---"); laptop1.displayStockDetails(); System.out.println("--------------------"); laptop2.displayStockDetails(); System.out.println("--------------------"); laptop3.displayStockDetails(); System.out.println("--------------------"); // Display the total number of laptops created System.out.println("Total number of laptops created: " + Laptop.getTotalLaptopsCreated()); ` Output: ` --- Laptop Details --- Brand: Dell RAM Size: 16GB Price: 1200.50 -------------------- Brand: HP RAM Size: 8GB Price: 850.00 -------------------- Brand: Apple RAM Size: 16GB Price: 1800.75 -------------------- Total number of laptops created: 3 ` --- 8) Shape Area Calculation Step 1: Create the abstract class Shape. This class defines an abstract method for calculating area. `java // Shape.java public abstract class Shape // Abstract method to calculate area public abstract double calculateArea(); ` Step 2: Design the Circle class. This class extends Shape, encapsulates the radius, and implements the calculateArea method. `java // Circle.java public class Circle extends Shape private double radius; // Constructor public Circle(double radius) this.radius = radius; // Implement the abstract method to calculate area for a circle @Override public double calculateArea() return Math.PI radius radius; // Optional: Getter for radius public double getRadius() return radius; ` Step 3: Create Main class to test. This class creates a Circle object and displays its computed area. `java // Main.java public class Main public static void main(String[] args) // Create a Circle object with radius 5.0 Circle circle = new Circle(5.0); // Display the computed area System.out.println("Circle Radius: " + circle.getRadius()); System.out.println("Computed Area: " + String.format("%.2f", circle.calculateArea())); ` Output: ` Circle Radius: 5.0 Computed Area: 78.54 ` --- 9) Course Management System Step 1: Define the CourseDisplay interface. This interface declares a method for displaying course information. `java // CourseDisplay.java public interface CourseDisplay void displayCourseDetails(); ` Step 2: Design the Course class. This class encapsulates attributes, provides access methods, and implements the CourseDisplay interface. `java // Course.java public class Course implements CourseDisplay private String courseCode; private String courseName; private int creditHours; // Constructor public Course(String courseCode, String courseName, int creditHours) this.courseCode = courseCode; this.courseName = courseName; this.creditHours = creditHours; // Access methods (Getters) public String getCourseCode() return courseCode; public String getCourseName() return courseName; public int getCreditHours() return creditHours; // Access methods (Setters - optional, but good practice for "access methods") public void setCourseCode(String courseCode) this.courseCode = courseCode; public void setCourseName(String courseName) this.courseName = courseName; public void setCreditHours(int creditHours) this.creditHours = creditHours; // Implement the interface method @Override public void displayCourseDetails() System.out.println("Course Code: " + courseCode); System.out.println("Course Name: " + courseName); System.out.println("Credit Hours: " + creditHours); ` Step 3: Create Main class to test. This class creates two Course objects and displays their details. `java // Main.java public class Main public static void main(String[] args) // Create two Course objects Course course1 = new Course("CS101", "Introduction to Programming", 3); Course course2 = new Course("MA201", "Calculus I", 4); System.out.println("--- Course 1 Details ---"); course1.displayCourseDetails(); System.out.println("------------------------"); System.out.println("--- Course 2 Details ---"); course2.displayCourseDetails(); System.out.println("------------------------"); ` Output: ` --- Course 1 Details --- Course Code: CS101 Course Name: Introduction to Programming Credit Hours: 3 ------------------------ --- Course 2 Details --- Course Code: MA201 Course Name: Calculus I Credit Hours: 4 ------------------------ ` --- 10) Gym Management System - Member Eligibility Step 1: Create the abstract class Person. This class encapsulates common attributes and defines an abstract method for checking eligibility. `java // Person.java public abstract class Person private String name; private int age; // Constructor public Person(String name, int age) this.name = name; this.age = age; // Getters public String getName() return name; public int getAge() return age; // Abstract method for checking eligibility public abstract boolean checkEligibility(); ` Step 2: Create the Member class. This class extends Person, adds a membershipType attribute, and implements the eligibility logic. `java // Member.java public class Member extends Person private String membershipType; // e.g., "Standard", "Premium" // Constructor public Member(String name, int age, String membershipType) super(name, age); // Call the constructor of the superclass (Person) this.membershipType = membershipType; // Getter for membershipType public String getMembershipType() return membershipType; // Implement the abstract method for eligibility check // Members aged 60 and above qualify for a discount @Override public boolean checkEligibility() return getAge() >= 60; public void displayMemberDetails() System.out.println("Name: " + getName()); System.out.println("Age: " + getAge()); System.out.println("Membership Type: " + membershipType); System.out.println("Eligible for Senior Discount: " + (checkEligibility() ? "Yes" : "No")); ` Step 3: Create Main class to test. This class creates Member objects and demonstrates the eligibility check. `java // Main.java public class Main public static void main(String[] args) // Create a member who qualifies for a discount Member seniorMember = new Member("John Doe", 65, "Gold"); System.out.println("--- Senior Member Details ---"); seniorMember.displayMemberDetails(); System.out.println("-----------------------------"); // Create a member who does not qualify Member regularMember = new Member("Jane Smith", 30, "Silver"); System.out.println("--- Regular Member Details ---"); regularMember.displayMemberDetails(); System.out.println("------------------------------"); // Create a member at the age threshold Member thresholdMember = new Member("Peter Jones", 60, "Bronze"); System.out.println("--- Threshold Member Details ---"); thresholdMember.displayMemberDetails(); System.out.println("--------------------------------"); ` Output: ` --- Senior Member Details --- Name: John Doe Age: 65 Membership Type: Gold Eligible for Senior Discount: Yes ----------------------------- --- Regular Member Details --- Name: Jane Smith Age: 30 Membership Type: Silver Eligible for Senior Discount: No ------------------------------ --- Threshold Member Details --- Name: Peter Jones Age: 60 Membership Type: Bronze Eligible for Senior Discount: Yes -------------------------------- `