src/main/java/com/hwua/erhai/util/Util.java

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package com.hwua.erhai.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Util {

    public static boolean isDigital(String s) {
        return s.matches("[0-9]*");
    }

    public static boolean isDouble(String s) {
        return s.matches("\\d+(\\.\\d+)?");
    }

    public static Date parseDate(String dateString) {
        try {
            return new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").parse(dateString);
        }
        catch (ParseException e) {
            throw new RuntimeException(String.format("failed to parseDate[%s]", dateString), e);
        }
    }

    public static String today() {

        return new SimpleDateFormat("yyyy-MM-dd").format(new Date());
    }


    public static String formatDate(Date date) {

        return new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(date);
    }

    public static void main(String[] args) {
        System.out.println(isDouble("54"));
        System.out.println(isDouble(""));
        System.out.println(isDouble("1ab"));
        System.out.println(isDouble("1.2"));
    }
}