ObjectUtil

import java.math.BigDecimal;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.util.GregorianCalendar;

public class ObjectUtil {

    private ObjectUtil() {
    }

    public static String convertToFormatString(Object obj, String dateFormat) {
        SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern(dateFormat);
        if (obj == null) {
            return "";
        } else if (obj instanceof Integer || obj instanceof Float || obj instanceof Double || obj instanceof Long) {
            return String.valueOf(obj);
        } else if (obj instanceof Date) {
            Date date = (Date) obj;
            return sdf.format(date);
        } else if (obj instanceof GregorianCalendar) {
            GregorianCalendar gregorianCalendar = (GregorianCalendar) obj;
            return sdf.format(gregorianCalendar.getTime());
        } else if (obj instanceof LocalDateTime) {
            LocalDateTime ldt = (LocalDateTime) obj;
            return ldt.format(dtf);
        } else if (obj instanceof LocalDate) {
            return obj + " 00:00:00";
        } else if (obj instanceof Timestamp) {
            Timestamp timestamp = (Timestamp) obj;
            return sdf.format(new Date(timestamp.getTime()));
        } else if (obj instanceof BigDecimal) {
            BigDecimal bigDecimal = (BigDecimal) obj;
            return bigDecimal.toPlainString();
        } else {
            return obj.toString();
        }
    }
}