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Thread: Homework help please

  1. #1
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    Default Homework help please

    I am having issues with creating class for my home work.

    The project: Designing and implementing a class called dog that contains instance datat that represents the dogs name and age. i have to define the dog constructor to accept and initialize instance data. include getter and setter methods for the name and age. include a metod to compute and return the age of the dog in person years. include a tostring method that returns a oneline description of the dog. crate a driver class call kennel, whose main method instantiates and updates several dog objects.

    So first is my dog class it is complies just fine

    //********************************************************************
    //  Dog.java       Author: Anastacia Williams
    //
    //  Get and set doog name and age
    //
    //	  ______________________________
    //           	  name of class
    //                    Dog
    //        ______________________________
    //            list of class variables
    //                  Age      int
    //					petAge   int
    //					Value    int
    //
    //
    //
    //        ______________________________
    //            list of class methods
    //                -int
    //				  -String Dog
    //				  +Dog
    //				  +getName
    //				  +setName
    //				  +getAge
    //				  +setAge
    //				  +HumanYear
    //				  +String toString
    //        ______________________________
    //
    //********************************************************************
     
    public class Dog
    {
       	private int Age ;  //age of animal
     
    	private String Name;  // name
     
    	private int HumanAge; //human age
     
       //-----------------------------------------------------------------
       //  Constructor: vallue
       //-----------------------------------------------------------------
       public Dog(String petname, int petAge, int Agetime7)
       {
           Name = petname;
           Age = petAge;
           HumanAge = Agetime7;
       }
     
       //-----------------------------------------------------------------
       //  Set name
       //-----------------------------------------------------------------
       public void setName(String petname)
       {
      	      Name = petname;
       }
     
       //-----------------------------------------------------------------
       //  get name
       //-----------------------------------------------------------------
       public String getName()
       {
    		      return Name;
       }
     
       //-----------------------------------------------------------------
       //  set age
       //-----------------------------------------------------------------
       public void setAge(int petAge)
       {
      		      int Age = petAge;
       }
     
       //-----------------------------------------------------------------
       //  Get age
       //-----------------------------------------------------------------
       public int getAge()
       {
      		      return Age;
       }
     
       //-----------------------------------------------------------------
       //  Humna years. formula age times 7
       //-----------------------------------------------------------------
       public void setHumanAge(int Agetime7)
       {
     
    			int HumanAge = Agetime7;
       }
     
     
    	public int getHumanAge()
    	 {
    	  		      return HumanAge;
       }
       //-----------------------------------------------------------------
       //  Returns a string representation to dog name an age
       //-----------------------------------------------------------------
       public String toString()
       {
     
     
      		return "Name of dog: " + Name + "Age of dog: " + Age + "Human age: " + HumanAge;
     
       }
    }


    This is my kennel
    //********************************************************************
    //  Kennel.java       Author: Anastacia Williams
    //
    //  Get and set doog name and age
    //
    //	  ______________________________
    //           	  name of class
    //
    //        ______________________________
    //            list of class variables
    //                  None
    //        ______________________________
    //            list of class methods
    //                +main
    //        ______________________________
    //
    //********************************************************************
     
     
    public class Kennel
    {
       //-----------------------------------------------------------------
       //  Generate aniaml name and age.
       //-----------------------------------------------------------------
     
     
      public static void main (String[] args)
       {
     
      		Dog dog1 = new Dog ("willy", 9, 63);
     
          System.out.println ( "First Dog " dog1.toString);
     
     
       }
    }

    the errors i encounter with kennel are:
    E:\New Folder\Kennel.java:32: error: ')' expected
    System.out.println ( "First Dog " dog1.toString);
    ^
    E:\New Folder\Kennel.java:32: error: illegal start of expression
    System.out.println ( "First Dog " dog1.toString);
    ^
    E:\New Folder\Kennel.java:32: error: ';' expected
    System.out.println ( "First Dog " dog1.toString);
    ^
    3 errors

    Tool completed with exit code 1

    Please help me


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Homework help please

    The arg to the println() method is a String. Separate Strings can be joined together to make one String by using the + operator.
    The compiler wants a ) after the String it has found after println(
    Join the two Strings to make one by putting a + between them
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Homework help please

    Quote Originally Posted by Norm View Post
    The arg to the println() method is a String. Separate Strings can be joined together to make one String by using the + operator.
    The compiler wants a ) after the String it has found after println(
    Join the two Strings to make one by putting a + between them

    Well since i added what you want this si the error code i get now
    I:\New Folder\Kennel.java:32: error: cannot find symbol
    System.out.println ( "First Dog " + dog1.toString);
    ________________________________^
    symbol: variable toString
    location: variable dog1 of type Dog
    1 error

    Tool completed with exit code 1

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Homework help please

    Is toString a variable in the Dog class? The compiler can not find its definition.

    The syntax for a method uses () at the end of the name.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: Homework help please

    yes. the first code is my Dog. public String toString() i am not sure if i need to add anything in there and i am very confused at why it is not working.

  6. #6
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    Default Re: Homework help please

    Do you know the difference between a variable and a method?
    A method is coded with () at the end of the name.
    What is toString?
    A variable or a method?
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: Homework help please

    I am sorry i am not sure.

  8. #8
    Super Moderator Norm's Avatar
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    If you don't understand my answer, don't ignore it, ask a question.

  9. #9
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    Default Re: Homework help please

    What the differences is. I read my text but i do not understand it.

  10. #10
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    Default Re: Homework help please

    So i redid my code for Dog.

    //********************************************************************
    //  Dog.java       Author: Anastacia Williams
    //
    //  Get and set doog name and age
    //
    //	  ______________________________
    //           	  name of class
    //                    Dog
    //        ______________________________
    //            list of class variables
    //                  Age      int
    //					petAge   int
    //					Value    int
    //
    //
    //
    //        ______________________________
    //            list of class methods
    //                -int
    //				  -String Dog
    //				  +Dog
    //				  +getName
    //				  +setName
    //				  +getAge
    //				  +setAge
    //				  +HumanYear
    //				  +String toString
    //        ______________________________
    //
    //********************************************************************
     
    public class Dog
    {
       	private int Age ;  //age of animal
     
    	private String Name;  // name
     
    	private int HumanAge; //human age
     
       //-----------------------------------------------------------------
       //  Constructor: vallue
       //-----------------------------------------------------------------
       public Dog(String petname, int petAge, int Agetime7, String NAH)
       {
           Name = petname;
           Age = petAge;
           HumanAge = Agetime7;
           String toString = NAH;
       }
     
       //-----------------------------------------------------------------
       //  Set name
       //-----------------------------------------------------------------
       public void setName(String petname)
       {
      	      Name = petname;
       }
     
       //-----------------------------------------------------------------
       //  get name
       //-----------------------------------------------------------------
       public String getName()
       {
    		      return Name;
       }
     
       //-----------------------------------------------------------------
       //  set age
       //-----------------------------------------------------------------
       public void setAge(int petAge)
       {
      		      int Age = petAge;
       }
     
       //-----------------------------------------------------------------
       //  Get age
       //-----------------------------------------------------------------
       public int getAge()
       {
      		      return Age;
       }
     
       //-----------------------------------------------------------------
       //  Humna years. formula age times 7
       //-----------------------------------------------------------------
       public void setHumanAge(int Agetime7)
       {
     
    			int HumanAge = Agetime7;
       }
     
     
    	public int getHumanAge()
    	 {
    	  		      return HumanAge;
       }
       //-----------------------------------------------------------------
       //  Returns a string representation to dog name an age
       //-----------------------------------------------------------------
       public String toString()
       {
     
    		String NAH = Dog.toString ("Name of dog: " + Name + "Age of dog: " + Age + "Human age: " + HumanAge);
      		return (NAH);
     
       }
    }

    now i am getting an error

    C:\Users\kids\Documents\bobobob\Dog.java:103: error: no suitable method found for toString(String)
    String NAH = Dog.toString ("Name of dog: " + Name + "Age of dog: " + Age + "Human age: " + HumanAge);
    ^
    method Dog.toString() is not applicable
    (actual and formal argument lists differ in length)
    method Object.toString() is not applicable
    (actual and formal argument lists differ in length)
    1 error

    Tool completed with exit code 1

  11. #11
    Super Moderator Norm's Avatar
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    Default Re: Homework help please

    The standard toString() method does not take any arguments. It's purpose is to return a String that describes the contents of the instance of the class it is a member of.

    Also if the toString() method in a class calls the toString() method in that same class, that will be a recursive call and can cause an infinite recursion of calls causing an exception.

    Remove the call to the toString() method and just build and return a String.
    If you don't understand my answer, don't ignore it, ask a question.

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