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public class CalendarTest {
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public static void main(String[] args) {
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Calendar cale = null;
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cale = Calendar.getInstance();
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int year = cale.get(Calendar.YEAR);
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int month = cale.get(Calendar.MONTH) + 1;
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int day = cale.get(Calendar.DATE);
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int hour = cale.get(Calendar.HOUR_OF_DAY);
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int minute = cale.get(Calendar.MINUTE);
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int second = cale.get(Calendar.SECOND);
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int dow = cale.get(Calendar.DAY_OF_WEEK);
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int dom = cale.get(Calendar.DAY_OF_MONTH);
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int doy = cale.get(Calendar.DAY_OF_YEAR);
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System.out.println("Current Date: " + cale.getTime());
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System.out.println("Year: " + year);
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System.out.println("Month: " + month);
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System.out.println("Day: " + day);
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System.out.println("Hour: " + hour);
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System.out.println("Minute: " + minute);
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System.out.println("Second: " + second);
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System.out.println("Day of Week: " + dow);
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System.out.println("Day of Month: " + dom);
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System.out.println("Day of Year: " + doy);
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SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
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String firstday, lastday;
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cale = Calendar.getInstance();
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cale.add(Calendar.MONTH, 0);
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cale.set(Calendar.DAY_OF_MONTH, 1);
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firstday = format.format(cale.getTime());
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cale = Calendar.getInstance();
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cale.add(Calendar.MONTH, 1);
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cale.set(Calendar.DAY_OF_MONTH, 0);
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lastday = format.format(cale.getTime());
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System.out.println("本月第一天和最后一天分别是 ： " + firstday + " and " + lastday);
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Date d = new Date();
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System.out.println("当前日期字符串1：" + format.format(d));
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System.out.println("当前日期字符串2：" + year + "/" + month + "/" + day + " "
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+ hour + ":" + minute + ":" + second);
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}
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}