Subclass toString should call include super.toString();re-submit these codes. public class Vehicle {    private String registrationNumber;    private String ownerName;    private double price;    private int yearManufactured;    Vehicle [] myVehicles = new Vehicle[100];      public Vehicle() {        registrationNumber="";        ownerName="";        price=0.0;        yearManufactured=0;    }    public Vehicle(String registrationNumber, String ownerName, double price, int yearManufactured) {        this.registrationNumber=registrationNumber;        this.ownerName=ownerName;        this.price=price;        this.yearManufactured=yearManufactured;    }    public String getRegistrationNumber() {        return registrationNumber;    }    public String getOwnerName() {        return ownerName;    }    public double getPrice() {        return price;    }    public int getYearManufactured() {        return yearManufactured;    }    public void setRegistrationNumber(String registrationNumber) {        this.registrationNumber=registrationNumber;    }    public void setOwnerName(String ownerName) {        this.ownerName=ownerName;    }    public void setPrice(double price) {        this.price=price;    }    public void setYearManufactured(int yearManufactured) {        this.yearManufactured=yearManufactured;    }      public String toString() {        return " Registration number:"+ registrationNumber +"\n Owner Name:"+ownerName+"\n Price:"+    price+"\n year manufactured"+yearManufactured;    } public static double findMin(Vehicle[] theVehicles) {    double lowestPrice = Vehicles[0];    for(int i=1; i<price.length;i++){    if(Vehicles[i] < lowestPrice){        lowestPrice = Vehicles[i];        }     }    return lowestPrice; }  public class Car extends Vehicle{    private int numberOfDoors;     public Car(String registrationNumber, String ownerName, double price, int yearManufactured, int numberOfDoors) {        super(registrationNumber, ownerName, price, yearManufactured);        this.numberOfDoors = numberOfDoors;    }     public int getNumberOfDoors() {        return numberOfDoors;    }     @Override    public String toString() {        return "Car{" +                "numberOfDoors=" + numberOfDoors +                '}';    }     public void setNumberOfDoors(int numberOfDoors) {        this.numberOfDoors = numberOfDoors;    }}public class Truck extends Vehicle{    private int numberOfAxles;     public Truck(String registrationNumber, String ownerName, double price, int yearManufactured, int numberOfAxles) {        super(registrationNumber, ownerName, price, yearManufactured);        this.numberOfAxles = numberOfAxles;    }     public int getNumberOfAxles() {        return numberOfAxles;    }     public void setNumberOfAxles(int numberOfAxles) {        this.numberOfAxles = numberOfAxles;    }     @Override    public String toString() {        return "Truck{" +                "numberOfAxles=" + numberOfAxles +                '}';    }}