public void add(Ptg token) {if (token == null) {throw new IllegalArgumentException("token must not be null");}_ptgs[_offset] = token;_offset++;}

public void add ( Ptg token ) { if ( token == null ) { throw new IllegalArgumentException ( "token must not be null" ) ; } _ptgs [ _offset ] = token ; _offset ++ ; }
public void Add(Ptg token){if (token == null){throw new ArgumentException("token must not be null");}_ptgs[_offset] = token;_offset++;}
