In this blog I’ll share a Java example that uses object-oriented programming to find the top 5 mobile phones for each brand. Imagine we have a ‘Mobile‘ class representing each phone with basic attributes like brand, model, and price. Additionally, we’ll create a ‘MobileManager‘ class to handle these phones and fetch the top 5 phones for each brand.”
Here’s an example implementation:
import java.util.*;
class Mobile {
private String brand;
private String model;
private double price;
public Mobile(String brand, String model, double price) {
this.brand = brand;
this.model = model;
this.price = price;
}
public String getBrand() {
return brand;
}
public double getPrice() {
return price;
}
@Override
public String toString() {
return brand + " " + model + " - $" + price;
}
}
class MobileManager {
private List<Mobile> mobiles;
public MobileManager() {
mobiles = new ArrayList<>();
}
public void addMobile(Mobile mobile) {
mobiles.add(mobile);
}
public Map<String, List<Mobile>> getTop5MobilesByBrand() {
Map<String, List<Mobile>> top5ByBrand = new HashMap<>();
for (Mobile mobile : mobiles) {
top5ByBrand.putIfAbsent(mobile.getBrand(), new ArrayList<>());
List<Mobile> brandMobiles = top5ByBrand.get(mobile.getBrand());
if (brandMobiles.size() < 5) {
brandMobiles.add(mobile);
brandMobiles.sort(Comparator.comparingDouble(Mobile::getPrice));
} else {
if (mobile.getPrice() > brandMobiles.get(0).getPrice()) {
brandMobiles.remove(0);
brandMobiles.add(mobile);
brandMobiles.sort(Comparator.comparingDouble(Mobile::getPrice));
}
}
}
return top5ByBrand;
}
}
public class Main {
public static void main(String[] args) {
MobileManager manager = new MobileManager();
// Adding mobile phones
manager.addMobile(new Mobile("Samsung", "Galaxy S21", 999.99));
manager.addMobile(new Mobile("Samsung", "Galaxy Note 20", 899.99));
manager.addMobile(new Mobile("Samsung", "Galaxy A52", 399.99));
manager.addMobile(new Mobile("Apple", "iPhone 12 Pro", 1099.99));
manager.addMobile(new Mobile("Apple", "iPhone SE", 399.99));
manager.addMobile(new Mobile("Apple", "iPhone 11", 699.99));
manager.addMobile(new Mobile("Xiaomi", "Redmi Note 10", 299.99));
manager.addMobile(new Mobile("Xiaomi", "Mi 11", 799.99));
manager.addMobile(new Mobile("Xiaomi", "POCO X3", 249.99));
// Getting top 5 mobiles for each brand
Map<String, List<Mobile>> top5ByBrand = manager.getTop5MobilesByBrand();
// Printing top 5 mobiles for each brand
for (String brand : top5ByBrand.keySet()) {
System.out.println("Top 5 mobiles for " + brand + ":");
List<Mobile> top5Mobiles = top5ByBrand.get(brand);
for (Mobile mobile : top5Mobiles) {
System.out.println(mobile);
}
System.out.println();
}
}
}
// OUTPUT :
/** Top 5 mobiles for Apple:
Apple iPhone SE - $399.99
Apple iPhone 11 - $699.99
Apple iPhone 12 Pro - $1099.99
Top 5 mobiles for Xiaomi:
Xiaomi POCO X3 - $249.99
Xiaomi Redmi Note 10 - $299.99
Xiaomi Mi 11 - $799.99
Top 5 mobiles for Samsung:
Samsung Galaxy A52 - $399.99
Samsung Galaxy Note 20 - $899.99
Samsung Galaxy S21 - $999.99 */This code defines a Mobile class to represent each mobile phone, a MobileManager class to manage mobile phones, and the Main class to demonstrate the usage of the MobileManager class by adding some mobile phones and getting the top 5 mobiles for each brand.
