Cloning class

Hii,

I am not very experienced in java and i have the following question. I need to clone the following class...i m using this class as nested class in my other class. But, still first i need to understand the cloning for this class.

public class Iterator implements Cloneable
     {
          /**
           * constructor that sets current index to <code>0</code>
           */
          public Iterator () { m_nCurrentIndex = 0; }

          /**
           * gets value of the current column by column index
           * @param nColumnIdx column that contains the value
           * @return returns the value of the current column or <code>""</code> if <code>nColumnIdx</code> is <code>null</code>
           */
          public String getValue (int nColumnIdx)
          {
               String outValue = ( getColumn ().get (nColumnIdx)!=null ) ? getColumn ().get (nColumnIdx) : "";  
               return outValue;
          }


          /**
           * gets value of the current column by column name
           * @param nColumnName column that contains the value
           * @return returns the value of the current column
           */
          public String getValue (String sColumnName)
               { return getColumn ().get (getColumnIndex (sColumnName)); }

          // access column
          /**
           * gets the column
           * @return returns current index
           */
          public StringArray getColumn ()
          // StringArray is another class...and i already have it cloneable...

               { return (StringArray)(m_ValueMatrix.get (m_nCurrentIndex)); }
           
           
          /**
           * sets a value to the given position
           * @param nColumnIdx columnindex where the new value should be stored
           * @param sColumnValue the new value
           */
          public void setValue(int nColumnIdx, String sColumnValue){
               if (getColumn ().get (nColumnIdx)!=null){
                    getColumn().set(nColumnIdx, sColumnValue);
               }
          }

          /**
           * checks if iterator is still valid
           * @return returns true if iterator is valid
           */
          public boolean isValid ()
               { return m_nCurrentIndex < m_ValueMatrix.size (); }
          /**
           * moves iterator to the next index
           */
          public void moveNext ()
               { ++m_nCurrentIndex; }

          // attributes
          /**
           * current index
           */
          private int m_nCurrentIndex;
         
          public Object clone(){
               Iterator iter_clone = new Iterator();
          // here i got stucked????????????
          // how to make cloneable...
               return iter_clone;
          }
         
     }

I have already done with the cloning of StringArray class i m using.
Can someone help me to do the cloning.

Thanks and regards
newtosql