public String getErrorDisplay(int c) {
		String s = String.valueOf((char)c);
		switch ( c ) {
			case Token.EOF :
				s = "<EOF>";
				break;
			case '\n' :
				s = "\\n";
				break;
			case '\t' :
				s = "\\t";
				break;
			case '\r' :
				s = "\\r";
				break;
		}
		return s;
	}
Return a list of all Token objects in input char stream.
 Forces load of all tokens. Does not include EOF token.
runtime/Java/src/org/antlr/v4/runtime/Lexer.java