/**
 * Simulation of a car, with methods to read the
 * car data and to convert the car data to a String
 */
import java.util.*;

public class Car1 {

  public String owner;   // owner's name
  public String license; // license plate
  public int speed;      // current speed

  /**
   * Read the data for a car from the user,
   * using screen prompts and scanner input.
   */
  public void readInput() {
    Scanner keyboard = new Scanner(System.in);
    System.out.println("Who is the owner of the car?");
    owner = keyboard.nextLine();

    System.out.println("What is the license plate?");
    license = keyboard.nextLine();

    System.out.println("What is the speed?");
    speed = keyboard.nextInt( );

    /*
     * Keep reading speed until user enters
     * a nonnegative number
     */
    while (speed < 0) {
      System.out.println("Speed cannot be negative.");
      System.out.println("Reenter speed:");
      speed = keyboard.nextInt();
    }
  }

  /**
   * Return a String containing the car data
   */
  public String toString() {
    String carData = "Owner: " + owner + "\n";
    carData += "License: " + license + "\n";
    carData += "Speed = " + speed + "\n";

    return carData;
  }
}

/**
 * A program to demonstrate the Car1 class by
 * instantiating 3 cars, getting user input 
 * for all 3, and finally printing each car.
 */

public class Car1Demo {

 public static void main(String[] args) {
   Car1 carA = new Car1();
   Car1 carB = new Car1();
   Car1 carC = new Car1();

   System.out.println("Enter data for carA:");
   carA.readInput();

   System.out.println("\nEnter data for carB:");
   carB.readInput();

   System.out.println("\nEnter data for carC:");
   carC.readInput();

   System.out.println("\nWe created 3 car objects:");
   System.out.println(carA);
   System.out.println(carB);
   System.out.println(carC);
 }
}