java获取当前年月日时分秒等

Calendarcal=Calendar.getInstance();

// 当前年
int year = cal.get(Calendar.YEAR);
// 当前月
int month = cal.get(Calendar.MONTH) + 1;
// 当前日
int day = cal.get(Calendar.DATE);
// 当前小时
int hour = cal.get(Calendar.HOUR_OF_DAY);
// 当前分钟
int minute = cal.get(Calendar.MINUTE);
// 当前秒
int second = cal.get(Calendar.SECOND);

System.out.println(year+“年”+month+“月”+ day +“日”+hour +“时” +minute +“分” +second+ “秒”);

// 当前是本周第几天
int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
// 当前是本月第几天
int dayOfMonth = cal.get(Calendar.DAY_OF_MONTH);
// 当前是本年第几天
int dayOfYear = cal.get(Calendar.DAY_OF_YEAR);

SimpleDateFormat format = new SimpleDateFormat(“yyyy-MM-dd”);
// 当月第一天
cal= Calendar.getInstance();
cal.add(Calendar.MONTH, 0);
cal.set(Calendar.DAY_OF_MONTH, 1);
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