public class DateDemo01 {
  public static void main(String[] args) {
  // 创建Date类对象
  Date date = new Date();
  // System.out.println(date);
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss E D");
  String str = sdf.format(date);
  System.out.println("现在是：" + str);
  }

public static void main(String[] args) {
  // 直接创建一个Calendar类对象是创建不了的，因为Calendar类是一个抽象类
  Calendar cal = Calendar.getInstance();
  // 获取年
  int year = cal.get(Calendar.YEAR);
  // 获取月
  int month = cal.get(Calendar.MONTH);
  // 获取日
  int day = cal.get(Calendar.DAY_OF_MONTH);
  // 获取时分秒
  int hour = cal.get(Calendar.HOUR_OF_DAY);
  int minute = cal.get(Calendar.MINUTE);
  int second = cal.get(Calendar.SECOND);
  // 获取星期
  int week = cal.get(Calendar.DAY_OF_WEEK);
  String xingQi = null;
  switch (week) {
  case 1:
    xingQi = "星期日";
    break;
  case 2:
    xingQi = "星期一";
    break;
  case 3:
    xingQi = "星期二";
    break;
  case 4:
    xingQi = "星期三";
    break;
  case 5:
    xingQi = "星期四";
    break;
  case 6:
    xingQi = "星期五";
    break;
  case 7:
    xingQi = "星期六";
    break;
  }
  String[] weeks = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
  System.out.println("现在是：" + year + "年" + (month + 1) + "月" + day + "日，"
    + hour + "点" + minute + "分" + second + "秒，" + weeks[week - 1]);
  System.out.println("今天是这一年中的第" + cal.get(Calendar.DAY_OF_YEAR) + "天");
  System.out.println("这个星期是这一年的第" + cal.get(Calendar.WEEK_OF_YEAR)
    + "个星期");
  }