protected Type(int typeCode,String typeSig){
  this.typeCode=typeCode;
  this.typeSig=typeSig;
  typeHash.put(typeSig,this);
}

protected Type ( int typeCode , String typeSig ) { this . typeCode = typeCode ; this . typeSig = typeSig ; typeHash . put ( typeSig , this ) ; }
create a type given a typecode and a type signature .
