Не подскажете в чем ошибка ? The method deepToString(Task_2.Car[][]) is undefined for the type Task_2.Car

package ua.lviv.lgs;
 
import java.util.Arrays;
import java.util.Collections;
import java.util.Random;
 
public class Task_2 {
 
 class Car {
 
  private int horse_forces;
  private int year;
 
  public Car(int horse_forces, int year) {
   super();
   this.horse_forces = horse_forces;
   this.year = year;
  }
 
  public int getHorse_forces() {
   return horse_forces;
  }
 
  public void setgetHorse_forces(int horse_forces) {
   this.horse_forces = horse_forces;
  }
 
  public int getYear() {
   return year;
  }
 
  public void setYear(int year) {
   this.year = year;
  }
 
  public String toString() {
   return "Car [ Horse forces = " + horse_forces + ", year = " + year + " ]";
 
  }
 
 
 }
 
 class Helm {
 
  private int helm_diametr;
  private String material;
 
  public Helm(int helm_diametr, String material) {
   super();
   this.helm_diametr = helm_diametr;
   this.material = material;
 
  }
 
  public int getHelm_diametr() {
   return helm_diametr;
  }
 
  public void setHelm_diametr(int helm_diametr) {
   this.helm_diametr = helm_diametr;
  }
 
  public String getMaterial() {
   return material;
  }
 
  public void setMaterial(String material) {
   this.material = material;
  }
 
 }
 
 class Engine {
 
  private int cylinder_count;
 
  public Engine(int cylinder_count) {
   super();
   this.cylinder_count = cylinder_count;
 
  }
 
  public int getCylinder_count() {
   return cylinder_count;
  }
 
  public void setCylinder_count(int cylinder_count) {
   this.cylinder_count = cylinder_count;
  }
 
 
 }
 
 
 
 
 public static void main(String[] args) {
 
  Car[][] arrayOfCars = {
   {
    new Car(getRandomValueFromRange(500, 900), getRandomValueFromRange(1950, 2018)), new Car(getRandomValueFromRange(500, 900), getRandomValueFromRange(1950, 2018)), new Car(getRandomValueFromRange(500, 900), getRandomValueFromRange(1950, 2018)), new Car(getRandomValueFromRange(500, 900), getRandomValueFromRange(1950, 2018)), new Car(getRandomValueFromRange(500, 900), getRandomValueFromRange(1950, 2018))
   }
  };
 
  System.out.println(Car.deepToString(arrayOfCars));
 
  Integer[] Car = new Integer[7];
  Arrays.fill(arrayOfCars, 100);
  System.out.println("array5 = " + Arrays.toString(arrayOfCars));
 
  System.out.println("After sorting asc");
  Arrays.sort(Car);
  System.out.println(Arrays.toString(Car));
 
  System.out.println("After sorting desc");
  Arrays.sort(Car, Collections.reverseOrder());
  System.out.println(Arrays.toString(Car));
 
 }
 
 public static int getRandomValueFromRange(int min, int max) {
 
  if (min >= max) {
   throw new IllegalArgumentException("min value must be smaller than max value");
  }
 
  Random r = new Random();
  return r.nextInt(max - min + 1) + min;
 }
 
}

 System.out.println(Arrays.deepToString(arrayOfCars));

Car[][] arrayOfCars = {
   {
   new Car(getRandomValueFromRange(500, 900), getRandomValueFromRange(1950, 2018)), new Car(getRandomValueFromRange(500, 900), getRandomValueFromRange(1950, 2018)), new Car(getRandomValueFromRange(500, 900), getRandomValueFromRange(1950, 2018)), new Car(getRandomValueFromRange(500, 900), getRandomValueFromRange(1950, 2018)), new Car(getRandomValueFromRange(500, 900), getRandomValueFromRange(1950, 2018))
   }
  };