Cardealership printing all cars with color green

/**-----------------------------PROGRAM TEST/TEST DEALER/MAIN METHOD--------------------------------**/

    public class testdealerchanging {
    public static void main(String[] args) {
    CarDealerShip dealer = new CarDealerShip();
    dealer.addNewCar("GM Buick Century", 2004, 20000,"Silver");
    dealer.addUsedCar("Toyota Corolla", 1999, 9000, true);
    dealer.addNewCar("Honda Civic", 2004, 15000, "Green");
    dealer.addNewCar("BMW 320i", 2004, 35000, "Black");
    dealer.addUsedCar("Toyota Sienna", 2000, 11000, false);

    System.out.println(dealer.printReport());

    System.out.println("****************************************");

    System.out.println(dealer.printAllCarsWithSellingPriceBelow(10000));

    System.out.println("****************************************");

     **System.out.println(dealer.printAllCarsOfColor("Green"));
    }**
    }




    /**-----------------------------DEALERSHIP--------------------------------**/

    class CarDealerShip {

    Car[] cars;
    int newCarIndex[] = new int[3];
    int count=0, countNewCar;
    int priceLimit = 0;

    String colorInput = "";

    public CarDealerShip() {           
    cars = new Car[81];
    count=0;
    countNewCar=0;
  }

     public void addNewCar(String name, int date, int amount, String c) { 
    NewCar newcar = new NewCar(name, date, amount, c);                        //create newcar object
    cars[count]=newcar;
    newCarIndex[countNewCar]=count;
    count++;
    countNewCar++;
  }               


     public void addUsedCar(String name, int date, int amount, boolean r) {
    UsedCar usedcar = new UsedCar(name, date, amount, r);
    cars[count]=usedcar;
    count++;
     }


      public String printReport() {


    String s=""; //prevent default null output

    for (int i=0; i<count; i++) 


      s+="car " +(i+1)+ ": " + cars[i].toString()+"Selling Price:" +cars[i].getRprice()+"\n"; //sum of all loops
    // s+=1+2 same as s=s+1+2

    return s;
  }


    public String printAllCarsWithSellingPriceBelow (int price) {
    String s="";
    priceLimit=price;
    for (int i=0; i<count; i++) { 
        if (cars[i].getPrice() < priceLimit)
          s+="cars below " + priceLimit + ": " + cars[i].toString()+"Selling    Price:" +cars[i].getRprice()+"\n";
    }
    return s;
  }

    public String printAllCarsOfColor(String color) {
    String s="";
    colorInput=color;
    for (int i=0; i<count; i++) { 
      **if (i == newCarIndex[i]) {**  

    if (((NewCar)cars[i]).getColor() == "Green")
          s+="cars with color " + "Green" + (i+1) + ": " +                             `enter                  code          here`enter code here`cars[i].toString()+"Selling Price:" +cars[i].getPrice()+"\n";
      }
    }
    return s;
  }
}

I'm having trouble with my cardealership program on printing all green colors

I get the errors I placed bolded in my program, I don't understand why I'm getting these errors.

 Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3
    at CarDealerShip.printAllCarsOfColor(testdealerchanging.java:179)
    at testdealerchanging.main(testdealerchanging.java:20)