jdbc-mysql基础 util.date 和 sql.date 的toString方法是不同的

礼悟：
　　   好好学习多思考，尊师重道存感恩。叶见寻根三二一，江河湖海同一体。
          虚怀若谷良心主，愿行无悔给最苦。读书锻炼强身心，诚劝且行且珍惜。

                             javaSE：8
                                    os：windows7 x64
                                   ide：MyEclipse 2017

代码

package com.jizuiku.jdbc;

/**
 * 
 * 
 * @author 给最苦
 * @version V17.11.08
 */
public class UtilDateToSqlDate {
	public static void main(String[] args) {
		
		java.util.Date uDate = new java.util.Date();
		System.out.println(uDate);
		
		// 进行转换
		java.sql.Date sDate = new java.sql.Date(uDate.getTime());
		System.out.println(sDate);
	}
}

 

效果

util.date的toString方法的源代码

    /**
     * Converts this <code>Date</code> object to a <code>String</code>
     * of the form:
     * <blockquote><pre>
     * dow mon dd hh:mm:ss zzz yyyy</pre></blockquote>
     * where:<ul>
     * <li><tt>dow</tt> is the day of the week (<tt>Sun, Mon, Tue, Wed,
     *     Thu, Fri, Sat</tt>).
     * <li><tt>mon</tt> is the month (<tt>Jan, Feb, Mar, Apr, May, Jun,
     *     Jul, Aug, Sep, Oct, Nov, Dec</tt>).
     * <li><tt>dd</tt> is the day of the month (<tt>01</tt> through
     *     <tt>31</tt>), as two decimal digits.
     * <li><tt>hh</tt> is the hour of the day (<tt>00</tt> through
     *     <tt>23</tt>), as two decimal digits.
     * <li><tt>mm</tt> is the minute within the hour (<tt>00</tt> through
     *     <tt>59</tt>), as two decimal digits.
     * <li><tt>ss</tt> is the second within the minute (<tt>00</tt> through
     *     <tt>61</tt>, as two decimal digits.
     * <li><tt>zzz</tt> is the time zone (and may reflect daylight saving
     *     time). Standard time zone abbreviations include those
     *     recognized by the method <tt>parse</tt>. If time zone
     *     information is not available, then <tt>zzz</tt> is empty -
     *     that is, it consists of no characters at all.
     * <li><tt>yyyy</tt> is the year, as four decimal digits.
     * </ul>
     *
     * @return  a string representation of this date.
     * @see     java.util.Date#toLocaleString()
     * @see     java.util.Date#toGMTString()
     */
    public String toString() {
        // "EEE MMM dd HH:mm:ss zzz yyyy";
        BaseCalendar.Date date = normalize();
        StringBuilder sb = new StringBuilder(28);
        int index = date.getDayOfWeek();
        if (index == BaseCalendar.SUNDAY) {
            index = 8;
        }
        convertToAbbr(sb, wtb[index]).append(‘ ‘);                        // EEE
        convertToAbbr(sb, wtb[date.getMonth() - 1 + 2 + 7]).append(‘ ‘);  // MMM
        CalendarUtils.sprintf0d(sb, date.getDayOfMonth(), 2).append(‘ ‘); // dd

        CalendarUtils.sprintf0d(sb, date.getHours(), 2).append(‘:‘);   // HH
        CalendarUtils.sprintf0d(sb, date.getMinutes(), 2).append(‘:‘); // mm
        CalendarUtils.sprintf0d(sb, date.getSeconds(), 2).append(‘ ‘); // ss
        TimeZone zi = date.getZone();
        if (zi != null) {
            sb.append(zi.getDisplayName(date.isDaylightTime(), TimeZone.SHORT, Locale.US)); // zzz
        } else {
            sb.append("GMT");
        }
        sb.append(‘ ‘).append(date.getYear());  // yyyy
        return sb.toString();
    }

sql.date toString方法的源代码

    /**
     * Formats a date in the date escape format yyyy-mm-dd.
     * <P>
     * @return a String in yyyy-mm-dd format
     */
    @SuppressWarnings("deprecation")
    public String toString () {
        int year = super.getYear() + 1900;
        int month = super.getMonth() + 1;
        int day = super.getDate();

        char buf[] = "2000-00-00".toCharArray();
        buf[0] = Character.forDigit(year/1000,10);
        buf[1] = Character.forDigit((year/100)%10,10);
        buf[2] = Character.forDigit((year/10)%10,10);
        buf[3] = Character.forDigit(year%10,10);
        buf[5] = Character.forDigit(month/10,10);
        buf[6] = Character.forDigit(month%10,10);
        buf[8] = Character.forDigit(day/10,10);
        buf[9] = Character.forDigit(day%10,10);

        return new String(buf);
    }

java优秀，值得学习。
学习资源：源代码 + 清净的心地。

jdbc-mysql基础 util.date 和 sql.date 的toString方法是不同的

标签：new   esc   time   escape   rar   sprintf   .sql   stat   available