java 使用GregorianCalendar类获取系统的当前时间

package Chapter11.date; import java.text.DateFormat; import java.util.Date; import java.util.GregorianCalendar; public class GregorianCalendarClass { /** * @param args */ public static void main(String[] args) { GregorianCalendarClass calendarClass = new GregorianCalendarClass(); calendarClass.Date_Format(); } public static void Date_Format() { System.out.println("使用GregorianCalendar类获取系统的当前时间的示例如下所示"); DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.FULL); // 创建一个GregorianCalendar日历对象 GregorianCalendar cal = new GregorianCalendar(); // 将日历系统的日期和时间设置给cal cal.setTime(new Date()); System.out.println("GregorianCalendar类的日期: " + dateFormat.format(cal.getTime())); // 将DAY_OF_WEEK的值设为MONDAY cal.set(GregorianCalendar.DAY_OF_WEEK, GregorianCalendar.SUNDAY); System.out.println("在本周内，星期日的日期为: " + dateFormat.format(cal.getTime())); int count = 0; System.out.println("符合条件的日期如下："); while (count <= 5) { // DAY_OF_MONTH的值设为7 cal.add(GregorianCalendar.DAY_OF_MONTH, 7); // 判断某月的某日的日期是15号且是星期日 if (cal.get(GregorianCalendar.DAY_OF_MONTH) == 15) { count++; System.out.println(dateFormat.format(cal.getTime())); } } } }