Question

我在java swing工作，我需要从jMonthChooser获得一年的jYearChooser和月份，然后将其格式化为此格式＆＃34; yyyy-MM-dd 00:00:00 < / EM>＆＃34; 这是我的代码，但它没有给出预期的输出

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请帮帮我

Answer 1

那是因为年参数在Date类构造函数中是特定的：

**
 * Allocates a <code>Date</code> object and initializes it so that
 * it represents midnight, local time, at the beginning of the day
 * specified by the <code>year</code>, <code>month</code>, and
 * <code>date</code> arguments.
 *
 * @param   year    the year minus 1900.
 * @param   month   the month between 0-11.
 * @param   date    the day of the month between 1-31.
 * @see     java.util.Calendar
 * @deprecated As of JDK version 1.1,
 * replaced by <code>Calendar.set(year + 1900, month, date)</code>
 * or <code>GregorianCalendar(year + 1900, month, date)</code>.
 */
@Deprecated
public Date(int year, int month, int date) {
    this(year, month, date, 0, 0, 0);
}

你也可以注意到这个构造函数是@Deprecated。所以更好的想法是使用Calendar：

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd 00:00:00");

Calendar c = Calendar.getInstance();
c.set(year, month, 1); // Specify day of month

String formattedDate = dateFormat.format(c.getTime());

使用jYearChooser和jMonthChooser

1 个答案: