public boolean isInteger(Object obj) {
        return obj.toString().matches("^-?\\d+$");
    }
PrintfFunction  ->  printf(strfmt [,obj ,...])
description:
- Return a formatted string from printf-style format strings
inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/string/PrintfFunction.java