Arrays.sort(fruits, Fruit.FruitNameComparator) - Fruit static object FruitNameComparator

import java.util.Arrays;

public class ComparatorTest {
   
    public static void main(String[] args){
        Fruit fruit1 = new Fruit("banana",1);
        Fruit fruit2 = new Fruit("apple",2);
        Fruit fruit3 = new Fruit("orange",3);
        Fruit[] fruits = {fruit1, fruit2, fruit3};
        
        // we can write comparator based on properties
        Arrays.sort(fruits,Fruit.FruitNameComparator);
       
        for (Fruit fruit: fruits){
            System.out.println(fruit.getName());
        }
    }

}


import java.util.Comparator;

public class Fruit implements Comparable{
    public static final Comparator<Fruit> FruitNameComparator = new Comparator<Fruit>(){

        @Override
        public int compare(Fruit fruit1, Fruit fruit2) {
            // fruit1.getName() is String, String.compareTo
            // String, Integer, Double all have compareTo()
            return fruit1.getName().compareTo(fruit2.getName());
        }
       
       
    };
    public Fruit(String name, int quantity) {
        super();
        this.name = name;
        this.quantity = quantity;
    }
   
    String name;
    int quantity;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getQuantity() {
        return quantity;
    }
    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }
   
    // comparable means this object is comparable so it can compareTo other object
    @Override
    public int compareTo(Object compareFruit) {
        int compareFruitQuantity = ((Fruit)compareFruit).getQuantity();
        //ascending order
        return this.getQuantity() - compareFruitQuantity;
    }
   

}

OUTPUT
apple
banana
orange