@Override public void clear(){
  Entry tab[]=table;
  modCount++;
  for (int index=tab.length; --index >= 0; )   tab[index]=null;
  count=0;
}

@ Override public void clear ( ) { Entry tab [ ] = table ; modCount ++ ; for ( int index = tab . length ; -- index >= 0 ; ) tab [ index ] = null ; count = 0 ; }
removes all mappings from this map .
