Creating a Java Desktop Class with Encapsulation and RAM Upgrade

Last update on May 16 2025 13:08:33 (UTC/GMT +8 hours)

Write a Java program to create a class called Desktop with private instance variables brand, processor, and ramSize. Provide public getter and setter methods to access and modify these variables. Add a method called upgradeRam() that takes an integer value and increases the ramSize by that value.

Sample Solution:

Java Code:

Desktop.java

// Define the Desktop class
public class Desktop {
    // Private instance variables
    private String brand;
    private String processor;
    private int ramSize;

    // Public getter for the brand variable
    public String getBrand() {
        return brand;
    }

    // Public setter for the brand variable
    public void setBrand(String brand) {
        this.brand = brand;
    }

    // Public getter for the processor variable
    public String getProcessor() {
        return processor;
    }

    // Public setter for the processor variable
    public void setProcessor(String processor) {
        this.processor = processor;
    }

    // Public getter for the ramSize variable
    public int getRamSize() {
        return ramSize;
    }

    // Public setter for the ramSize variable
    public void setRamSize(int ramSize) {
        this.ramSize = ramSize;
    }

    // Method to upgrade the RAM size by a given value
    public void upgradeRam(int additionalRam) {
        if (additionalRam > 0) {
            this.ramSize += additionalRam;
        }
    }
}

Main.java

public class Main {
    // Main method to test the Desktop class
    public static void main(String[] args) {
        // Create a new Desktop object
        Desktop desktop = new Desktop();

        // Set the brand, processor, and initial RAM size of the desktop
        desktop.setBrand("ComputeMaster");
        desktop.setProcessor("Intel Core i7");
        desktop.setRamSize(32);

        // Upgrade the RAM size by 32 GB
        desktop.upgradeRam(32);

        // Print the details of the desktop
        System.out.println("Brand: " + desktop.getBrand());
        System.out.println("Processor: " + desktop.getProcessor());
        System.out.println("RAM Size: " + desktop.getRamSize() + "GB");
    }
 }

Output:

Brand: ComputeMaster
Processor: Intel Core i7
RAM Size: 64GB

Explanation:

Private Instance Variables: The brand, processor, and ramSize variables are declared as private to ensure encapsulation.
Public Getters and Setters: These methods provide controlled access to the private variables.

getBrand(): Returns the brand.
setBrand(String brand): Sets the brand.
getProcessor(): Returns the processor.
setProcessor(String processor): Sets the processor.
getRamSize(): Returns the RAM size.
setRamSize(int ramSize): Sets the RAM size.

upgradeRam Method: Takes an integer value and increases the ramSize by that value if it's positive.
Main Method: Tests the functionality of the Desktop class by creating an instance, setting its properties, upgrading the RAM, and printing the details.

Note on Encapsulation

Encapsulation works in the above exercise by:

Hiding Data: The private instance variables brand, processor, and ramSize are not accessible directly from outside the class.
Controlled Access: The public getter and setter methods provide controlled access to the private variables, allowing for validation and modification when necessary.
Data Integrity: Encapsulation helps maintain data integrity by ensuring that the internal state of the object can only be changed through well-defined methods.

For more Practice: Solve these Related Problems:

Write a Java program where the "Desktop" class prevents upgrading RAM beyond a limit.
Write a Java program where the "Desktop" class includes a method to check system compatibility for software.
Write a Java program where the "Desktop" class allows users to upgrade the processor only to supported models.
Write a Java program where the "Desktop" class includes a method to estimate power consumption.

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