String (PsiMethod method) { final StringBuilder buf = new StringBuilder(); final PsiParameter[] parameters = method.getParameterList().getParameters(); if (parameters.length != 1) { buf.append("("); } buf.append(StringUtil.join(parameters, ReplaceWithLambdaFix::composeParameter, ",")); if (parameters.length != 1) { buf.append(")"); } buf.append("-> {}"); return buf.toString(); }