Auto Object:

package Suarez;

public class AutoObject {
    private String model;
    private int miles;
    private double gallons;

    public AutoObject() //Default constructor
    {
        model = "";
        miles = 0;
        gallons = 0.0;
    }

    public AutoObject(String model1, int miles1, double gallons1) //Default constructor
    {
        model = model1;
        miles = miles1;
        gallons = gallons1;
    }

    public AutoObject setAutoModel(String model1) {
        this.model = model1;
        return this;

    }

    public AutoObject setAutoMiles(int miles1) {
        this.miles = miles1;
        return this;

    }

    public AutoObject setAutoGallons(double gallons1) {
        this.gallons = gallons1;
        return this;

    }

    public int getMiles() {

        return miles;
    }

    public String getModel() {
        return model;
    }

    public double getGallons() {
        return gallons;
    }

    @Override
    public String toString() {
        return "The number of miles driven is (" + miles + ") + \n+\"The number of gallons is (" + gallons + ")" + " The model is a (" + model + ")";

    }

    @Override
    public boolean equals(Object object1) {
        if (object1 instanceof AutoObject) {
            AutoObject auto2 = (AutoObject) object1;
            if (model.equals(auto2.model) && miles == auto2.miles && Math.abs(gallons - auto2.gallons) < 0.0001) {
                return true;
            } else {
                return false;
            }
        } else {
            System.out.println("The object must be of type Auto");
            return false;

        }
    }
}


Auto Array List

package Suarez;
import java.util.*;
public class AutoArrayList {
    private ArrayList<AutoObject> cars;

    public AutoArrayList(){
        cars = new ArrayList<AutoObject>(10);
    }

    public void addToList(AutoObject auto) {

        cars.add(auto);

    }

    public void replaceInList(int index, AutoObject auto) {

        cars.set(index, auto);

    }

    public void printList() {

        for(AutoObject auto1: cars){
            System.out.println(auto1.toString());
        }

    }

    public void setListModel(String model) {

        for(int i = 0; i < cars.size(); i++){
            cars.set(i, cars.get(i).setAutoModel(model));
        }

    }

    public int findMaximumMiles(){
        int max = -1;
        for(int i = 0; i < cars.size(); i++){
            if(cars.get(i).getMiles() > max ){
                max = cars.get(i).getMiles();
            }
        }
        return max;
    }

    public int modelSearch(String model){
        int count = 0;
        for(int i = 0; i < cars.size(); i++){
            if(cars.get(i).getModel().equals(model)){
                count ++;
            }
        }
        return count;
    }

}

Auto Array List Object

package Suarez;
import java.util.*;
public class AutoArrayListObject {
    public static void main(String[] args) {
        AutoArrayList listOfCars = new AutoArrayList();
        AutoObject auto1 = new AutoObject("Ford", 100,10.00);
        AutoObject auto2 = new AutoObject("Honda", 200,20.00);
        AutoObject auto3 = new AutoObject("Toyota", 300,30.00);
        AutoObject auto4 = new AutoObject("Tesla", 400,40.00);
        AutoObject auto5 = new AutoObject("BMW", 500,50.00);
        AutoObject auto6 = new AutoObject("Chevrolet", 600,60.00);
        listOfCars.addToList(auto1);
        listOfCars.addToList(auto2);
        listOfCars.addToList(auto3);
        listOfCars.addToList(auto4);
        listOfCars.addToList(auto5);
        listOfCars.addToList(auto6);
        AutoObject auto7 = new AutoObject("Nissan",400,30.00);
        listOfCars.replaceInList(3,auto7);
        listOfCars.printList();
        listOfCars.setListModel("Kia");
        listOfCars.findMaximumMiles();
        listOfCars.modelSearch("Kia");
    }
}