面试居然让我获取当前月份第一天跟最后一天，主要是尴尬的回答不上来。
废话不说，直接贴代码，工作应该是够用了
代码语言：javascript复制public class TestCalendar {
// 日期也就是这了
public static void main(String[] args) {
// 获取当前年份、月份、日期
Calendar cale = null;
cale = Calendar.getInstance();
int year = cale.get(Calendar.YEAR);
int month = cale.get(Calendar.MONTH) 1;
int day = cale.get(Calendar.DATE);
int hour = cale.get(Calendar.HOUR_OF_DAY);
int minute = cale.get(Calendar.MINUTE);
int second = cale.get(Calendar.SECOND);
int dow = cale.get(Calendar.DAY_OF_WEEK);
int dom = cale.get(Calendar.DAY_OF_MONTH);
int doy = cale.get(Calendar.DAY_OF_YEAR);
System.out.println("Current Date: " cale.getTime());
System.out.println("Year: " year);
System.out.println("Month: " month);
System.out.println("Day: " day);
System.out.println("Hour: " hour);
System.out.println("Minute: " minute);
System.out.println("Second: " second);
System.out.println("Day of Week: " dow);
System.out.println("Day of Month: " dom);
System.out.println("Day of Year: " doy);
// 获取当月第一天和最后一天
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
String firstday, lastday;
// 获取前月的第一天
cale = Calendar.getInstance();
cale.add(Calendar.MONTH, 0);
cale.set(Calendar.DAY_OF_MONTH, 1);
Date time = cale.getTime();
firstday = format.format(cale.getTime());
// 获取前月的最后一天
cale = Calendar.getInstance();
cale.add(Calendar.MONTH, 1);
cale.set(Calendar.DAY_OF_MONTH, 0);
lastday = format.format(cale.getTime());
Date time2 = cale.getTime();
System.out.println(time);
System.out.println(time2);
System.out.println("本月第一天和最后一天分别是 ： " firstday " and " lastday);
// 获取当前日期字符串
Date d = new Date();
System.out.println("当前日期字符串1：" format.format(d));
System.out.println("当前日期字符串2：" year "/" month "/" day " " hour ":" minute ":" second);
SimpleDateFormat format2 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
System.out.println(format2.format(d));
}
}
