Constructor undefined error

[mansi gupte]

This is my code

   
import java.util.LinkedList;

	
	public class Network
	{

	
	  public LinkedList<MSS> children;
	  private int counter = 0;
	  
	  //
	  // Constructors
	  //
	  public Network ()
	  {
	      children = new LinkedList();
	  };
	  
	
	
	  public MSS CreateMSS( int id_start )
	  {
	      children.add(new MSS(counter++, this, id_start ));
	      return children.getLast();
	  }

	}
 

The problem is that when i run, i get the constructor undefined error at line -->children.add(new MSS(counter++, this, id_start )); , which i am not able to find why??

can someone explain the reason?

[Henry Wong]

piya rai wrote:
The problem is that when i run, i get the constructor undefined error at line -->children.add(new MSS(counter++, this, id_start )); , which i am not able to find why??

can someone explain the reason?

Well, does the MSS class have a constructor that takes an int, an Network instance, and an int as the three parameters?

Henry

[Wouter Oet]

you mean line 24??

[Harpreet Singh janda]

Can you please post the class MSS's code?

[Abimaran Kugathasan]

yup! put the coding of class MSS!

[Aditya Kanitkar]

@piya rai : You should find out a Paramaterised Constructor in MSS class which is
having an int, a Network object and one more int.

If there isnt any like above in MSS. You need to make some changes to your code.

[Jesper de Jong]

What does this have to do with the SCJP exam? I'm moving this to a more appropriate forum.

Note that there's a semi-colon in line 18 which should not be there.

[Campbell Ritchie]

Please avoid everybody saying the same thing several times.

[Abimaran Kugathasan]

Jesper Young wrote:What does this have to do with the SCJP exam? I'm moving this to a more appropriate forum.

Note that there's a semi-colon in line 18 which should not be there.

That's legal.... see the coding below. It compiles fine & runs fine. And the output is 10.

   
class CheckConstructor	{
	public CheckConstructor()	{
		i = 10;
	}; // Legal

	int i;

	public static void main(String[] args)	{
		System.out.println(new CheckConstructor().i);
	}
}
 

[Campbell Ritchie]

Jesper is correct; the semi-colon ought not to be there. The fact that an empty statement will compile doesn't mean it ought to be there.

[Abimaran Kugathasan]

Campbell Ritchie wrote:Jesper is correct; the semi-colon ought not to be there. The fact that an empty statement will compile doesn't mean it ought to be there.

You mean....

class CheckConstructor	{
	public CheckConstructor()	{
		i = 10;
	};
	;
	;

	int i;

	public static void main(String[] args)	{
		System.out.println(new CheckConstructor().i);
	};
}

Ok. It's clear to me! On that question, then in that question, that's not a problem. We needn't consider it.

[mansi gupte]

Henry Wong wrote:

piya rai wrote:
The problem is that when i run, i get the constructor undefined error at line -->children.add(new MSS(counter++, this, id_start )); , which i am not able to find why??

can someone explain the reason?

Well, does the MSS class have a constructor that takes an int, an Network instance, and an int as the three parameters?

Henry

yes it does..

[Henry Wong]

piya rai wrote:

Henry Wong wrote:

piya rai wrote:
The problem is that when i run, i get the constructor undefined error at line -->children.add(new MSS(counter++, this, id_start )); , which i am not able to find why??

can someone explain the reason?

Well, does the MSS class have a constructor that takes an int, an Network instance, and an int as the three parameters?

Henry

yes it does..

Well, your compiler says otherwise. So... As many has already mentioned, show us the code. Or we really can't help you.

Henry

[mansi gupte]

Henry Wong wrote:

piya rai wrote:

Henry Wong wrote:

piya rai wrote:
The problem is that when i run, i get the constructor undefined error at line -->children.add(new MSS(counter++, this, id_start )); , which i am not able to find why??

can someone explain the reason?

Well, does the MSS class have a constructor that takes an int, an Network instance, and an int as the three parameters?

Henry

yes it does..

Well, your compiler says otherwise. So... As many has already mentioned, show us the code. Or we really can't help you.

Henry

  


import java.util.LinkedList;
import java.util.Iterator;

public class MSS {
 
  public LinkedList<MobileHost> children;
  private int ID = 0;
  private int counter = 0;
  private Network parent;
  //
  // Constructors
  //
  public MSS ( int new_id, Network par, int start )
  {
      ID = new_id;
      children = new LinkedList();
      parent = par;
      counter = start;
  };
  
  //
  // Methods
  //

 
  private void setID ( int newVar )
  {
      ID = newVar;
  }

 
  public int getID ( )
  {
      return ID;
  }

 
  public MobileHost FindMH( int address ) throws Exception
  {
      Iterator<MSS> iter = parent.children.listIterator();
      Iterator<MobileHost> iter2;

      while (iter.hasNext())
      {
          iter2 = iter.next().children.iterator();
          while (iter2.hasNext())
          {
              MobileHost found = iter2.next();
              if (found.getId() == address)
              {
                  return found;
              }
          }
      }
      throw new Exception();
  }

  public void CreateMH()
  {
      // Add new MH to the list
      children.add(new MobileHost( counter++, this ));
  }

  
  public void RemoveMH( int id )
  {
      Iterator<MobileHost> iter = children.listIterator();
      while (iter.hasNext())
      {
          if (iter.next().getId() == id)
          {
              iter.remove();
          }
      }
  }
}