public LongColumn(int nrows,int capacity,long defaultValue){
  super(long.class,new Long(defaultValue));
  if (capacity < nrows) {
    throw new IllegalArgumentException("Capacity value can not be less than the row count.");
  }
  m_values=new long[capacity];
  Arrays.fill(m_values,defaultValue);
  m_size=nrows;
}

public LongColumn ( int nrows , int capacity , long defaultValue ) { super ( long . class , new Long ( defaultValue ) ) ; if ( capacity < nrows ) { throw new IllegalArgumentException ( "Capacity value can not be less than the row count." ) ; } m_values = new long [ capacity ] ; Arrays . fill ( m_values , defaultValue ) ; m_size = nrows ; }
create a new longcolumn .
