Question

Given the following class:

public class Vehicle
{
protected String manufacturer; // vehicle manufacturer
protected int year; // model year
protected char fuelType; // G = gas, E = electric, D = diesel, W = wind, U = unknown
protected String VIN; // an String to hold the 17 characters of the vehicle's VIN number.

... // no-arg constructor defined, as are all get/set methods.

}

Write me:

An overloaded constructor (takes the four data members as parameters): assume that a custom exception class called InvalidVINException exists. Your constructor will test to ensure that the first character of the VIN is a digit, if not through an exception. Will also test to ensure that the VIN is exactly 17 characters in length, if not through an exception. Both exceptions must have a custom message.

a copy constructor, and

an equals method.

a toString method

please i need the answer in java language

Answer 1

import java.util.Objects;

public class Vehicle
{
    protected String manufacturer; // vehicle manufacturer
    protected int year; // model year
    protected char fuelType; // G = gas, E = electric, D = diesel, W = wind, U = unknown
    protected String VIN; // an String to hold the 17 characters of the vehicle's VIN number.

    public Vehicle(String manufacturer, int year, char fuelType, String VIN) throws InvalidVINException {
        if(!Character.isDigit(VIN.charAt(0))) {
            throw new InvalidVINException("First VIN character is not a digit");
        } else if(VIN.length() != 17) {
            throw new InvalidVINException("VIN is not of length 17");
        }
        this.manufacturer = manufacturer;
        this.year = year;
        this.fuelType = fuelType;
        this.VIN = VIN;
    }

    public Vehicle(Vehicle vehicle) {
        this.manufacturer = vehicle.manufacturer;
        this.year = vehicle.year;
        this.fuelType = vehicle.fuelType;
        this.VIN = vehicle.VIN;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Vehicle vehicle = (Vehicle) o;
        return year == vehicle.year &&
                fuelType == vehicle.fuelType &&
                manufacturer.equals(vehicle.manufacturer) &&
                VIN.equals(vehicle.VIN);
    }

    @Override
    public String toString() {
        return "Vehicle{" +
                "manufacturer='" + manufacturer + '\'' +
                ", year=" + year +
                ", fuelType=" + fuelType +
                ", VIN='" + VIN + '\'' +
                '}';
    }
}