Simple Java issue actual and formal arguments lists differ in length

Question

I'm currently working on a very simple script and I'm getting an error that doesn't pop up in the example provided. I have a set of code and a client to test it. I'm getting this error when I try to run the code. I get this for all three instances where I try to use "new Class" in the client.

ClassClient.java:5: error: constructor Class in class Class cannot be applied to given types;

     Class code = new Class("1234");
                  ^
required: String,String,String
found: String
reason: actual and formal argument lists differ in length

Here is the first set of code:

public class Class
{
//attributes
public  String code;
private String name;
private String credit;

//constructor
public Class(String newCode, String newName, String newCredit)
{
  setCode(newCode);
  setName(newName);
  setCredit(newCredit);
}

//get|sets

public String getCode()
{
   return code;
}

public void setCode(String newCode)
{
   code = newCode;
}

public String getName()
{
   return name;
}

 public void setName(String newName)
{
   name = newName;
}

public String getCredit()
{
   return credit;
}

public void setCredit(String newCredit)
{
   credit = newCredit;
}

public String toString()
{
return ("The code for this class is: "+code + "\n" + "The name for this class is :"+name + "\n" +  "The number of credits this course has is :"+credit);
}

public boolean equals(Object o)
{
if(!(o instanceof Class))
   return false;
else
{
   Class x = (Class) o;
   Class y = (Class) o;
   Class z = (Class) o;

   return(code.equals(x.code) || name.equals(y.name) || credit.equals(z.credit));
}


}//endelse
}//end class

And here is the client that tests the code:

public class ClassClient
{
public static void main(String [] args)
  {
     Class code = new Class("1234");
     Class name = new Class("Java");
     Class credit = new Class("4");
     System.out.println("The code for this class is: "+code + "\n" + "The name for this class is :"+name + "\n" +  "The number of credits this course has is :"+credit);
  }
}

I would suggest to please read the compile time error which the compiler showed. Clearly mentioned there what it needs. — shikjohari
– shikjohari, Commented Jan 23, 2015 at 9:32

Ruchira Gayan Ranaweera · Accepted Answer · 2015-01-23 09:27:34Z

1

Constructor in class accept 3 String arguments not 1.

You can change

 Class code = new Class("1234"); // you are calling single argument
 Class name = new Class("Java"); // but there is no matching 
 Class credit = new Class("4"); // constructor for this

To

 Class cl = new Class("1234","Java","4");

Additionally to get values you should use getters.

You can change

System.out.println("The code for this class is: "+code + "\n" 
      + "The name for this class is :"+name + "\n" 
             +  "The number of credits this course has is :"+credit);

To

System.out.println("The code for this class is: "+cl.getCode() + "\n" 
      + "The name for this class is :"+cl.getName() + "\n" 
             +  "The number of credits this course has is "+cl.getCredit());

answered Jan 23, 2015 at 9:27

Ruchira Gayan Ranaweera

35.7k17 gold badges78 silver badges117 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Mattias Buelens Over a year ago

Additionally, the println statement should use the getter methods to get the code, name and credit of the created Class object.

Michael DeMarco Over a year ago

I'm actually looking for my client to test all 3 inputs of "code" "name" and "credit" individually. Using this method doesn't it just set the strings of "1234" "java" and "4" to code instead of using all 3 predefined strings? Would I need to change how my constructor is laid out?

Ruchira Gayan Ranaweera Over a year ago

@MattiasBuelens yes. I added that part to answer.

Michael DeMarco Over a year ago

Ah I see, thank you very much. I'm a bit inexperienced so it didn't make sense at first to me haha

someone · Accepted Answer · 2015-01-23 09:33:06Z

0

You are correct in your ClassClient if you have a constructor in Class class like this.

  //constructor

 public Class(String somethig)
   {
     // set somethig
  }

but in you constructor it expecting three arguments. but you have providded only one.

answered Jan 23, 2015 at 9:33

someone

6,5728 gold badges43 silver badges63 bronze badges

Collectives™ on Stack Overflow

Simple Java issue actual and formal arguments lists differ in length

2 Answers 2

4 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related