Java Learning Series - Exploring Comparable and Comparator Interface and it's methods

In Mobile class, I implement Comparable Interface and override it's compareTo() method to write default/natural sorting.

Mobile.java

package com.company.collections;

public class Mobile implements Comparable<Mobile>{

    private String brand;
    private int price;
    private int ram;
    private int rating;

    public Mobile(String brand, int price, int ram, int rating) {
        super();
        this.brand = brand;
        this.price = price;
        this.ram = ram;
        this.rating = rating;
    }

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public int getPrice() {
        return price;
    }

    @Override
    public String toString() {
        return this.brand + " - " + this.price + " - " + this.ram + " - " + this.rating;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public int getRam() {
        return ram;
    }

    public void setRam(int ram) {
        this.ram = ram;
    }

    public int getRating() {
        return this.rating;
    }

    public void setRating(int rating) {
        this.rating = rating;
    }

    @Override
    public int compareTo(Mobile mobile) {
        return mobile.price - this.price;
    }


}

In CompareRam class, then I implement Comparator Interface and override it's compare() method to write alternative/custom sorting for Ram.

CompareRam.java

package com.company.collections;
import java.util.Comparator;

public class CompareRam implements Comparator<Mobile>{

    @Override
    public int compare(Mobile a, Mobile b) {
        return a.getRam() - b.getRam();
    }

}

In CompareLogic class, I also implement Comparator Interface and override it's compare() method to write alternative/custom sorting for Rating.

CompareLogic.java

package com.company.collections;

import java.util.Comparator;

public class CompareLogic implements Comparator<Mobile>{

    @Override
    public int compare(Mobile a, Mobile b) {
        return a.getRating() - b.getRating();
    }   
}

Main.java

package com.company.collections;

import java.util.ArrayList;
import java.util.Collections;

public class Main {

    public static void main(String[] args) {

        ArrayList<Mobile> arr = new ArrayList<>();

        arr.add(new Mobile("mi", 20000, 6, 4));
        arr.add(new Mobile("realme", 15000, 4, 3));
        arr.add(new Mobile("Samsung", 30000, 8, 5));

        CompareLogic logic = new CompareLogic();
        CompareRam ram = new CompareRam();

//      Collections.sort(arr);
//      System.out.println(arr);

        Collections.sort(arr,logic);
        System.out.println(arr);

//      Collections.sort(arr, ram);
//      System.out.println(arr);
    }
}

Output:

//Default price sorting
[Samsung - 30000 - 8 - 5, mi - 20000 - 6 - 4, realme - 15000 - 4 - 3]

//Custom rating sorting
[realme - 15000 - 4 - 3, mi - 20000 - 6 - 4, Samsung - 30000 - 8 - 5]

//Custom ram sorting
[realme - 15000 - 4 - 3, mi - 20000 - 6 - 4, Samsung - 30000 - 8 - 5]