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Thread: Problems with driver class

  1. #1
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    Question Problems with driver class

    Ok hello! I am working on a driver class in java and I have pretty much followed what the book says and I have yet to get this right. Help would be greatly appreciated. Below is the task I am working on plus error messages:


    "Create a driver class called PetStore, whose main method instantiates six puppy objects (make up breeds, colors, and weights) and prints out who is for sale (print all 6 puppy objects). Use the setter methods to modify the breed of 2 puppies, the color of 2 different puppies, and the weight of the remaining 2 puppies. Use the getter method in a statement to print the puppies whose breed, color or weight were changed. "

    I can get my puppy class to compile with no problem:

     
    public class Puppy
    {
      String color,breed;
      double weight;
      double food ;
     
      public Puppy (String newBreed,String newColor,double newWeight,double newFood)
    {
     breed= newBreed;
     weight= newWeight;
     color= newColor;
     food= newFood;
      }
      public String getBreed()
      {
      return breed;
      }
      public String getColor()
      {
      return color;
      }
      public double getWeight()
      {
      return weight;
      }
      public double getFood()
      {
      double DOG_FOOD = 0.84;
      return weight * DOG_FOOD;
      }
      public String toString()
      {
      String description;
      description= " The color of the puppy is " + color + ".\n" +
      "The breed of the puppy is " + breed + " and is " + weight + "pounds.\n"+
      "The recommended amount to feed your puppy is " + getFood() + "ounces." ;
      return description;
      }
    }


    It is my driver class that I am getting wrong:

    public class PetStore
    {
       public static void main (String[] args)
       {
     
          Puppy p1 = new Puppy ("brown","lab", 4.5);
     
          Puppy p2 = new Puppy ("white","poodle",3.5);
     
          System.out.println( "The puppy is a  " + p2.getBreed() + "and is\n\t " + p2.getColor+
          "and currently weighs " + p2.getWeight()+ ".\n\t" + "feed your new puppy " +p2.getFood+
          "ounces twice a day.");
     
     
     
          System.out.println(p1);
          System.out.println(p2);
     
     
       }
     
     }

    and error messages:


     ----jGRASP exec: javac -g PetStore.java
     
    PetStore.java:12: error: constructor Puppy in class Puppy cannot be applied to given types;
          Puppy p1 = new Puppy ("brown","lab", 4.5);
                     ^
      required: String,String,double,double
      found: String,String,double
      reason: actual and formal argument lists differ in length
    PetStore.java:14: error: constructor Puppy in class Puppy cannot be applied to given types;
          Puppy p2 = new Puppy ("white","poodle",3.5);
                     ^
      required: String,String,double,double
      found: String,String,double
      reason: actual and formal argument lists differ in length
    PetStore.java:16: error: cannot find symbol
          System.out.println( "The puppy is a  " + p2.getBreed() + "and is\n\t " + p2.getColor+
                                                                                     ^
      symbol:   variable getColor
      location: variable p2 of type Puppy
    PetStore.java:17: error: cannot find symbol
          "and currently weighs " + p2.getWeight()+ ".\n\t" + "feed your new puppy " +p2.getFood+
                                                                                        ^
      symbol:   variable getFood
      location: variable p2 of type Puppy
    4 errors


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Problems with driver class

    reason: actual and formal argument lists differ in length
    The compiler sees that the arguments lists for the Puppy class don't match
    Look at the Puppy class's constructor and compare it to the new statement that is calling the constructor.
    The arguments must match.

    cannot find symbol variable getColor
    The compiler recognizes method names by their ending (). Without the () the compiler is looking for a variable.
    If you don't understand my answer, don't ignore it, ask a question.

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