1 package testweb; 2 3 import java.util.*; 4 import java.text.*; 5 6 public class Test { 7 8 public static void main(String[] args) { 9 10 /* 11 * SimpleDateFormat sdf = new SimpleDateFormat("E"); Calendar cal = 12 * Calendar.getInstance(); cal.add(Calendar.DATE,-5); Date date = 13 * cal.getTime(); String time_str = sdf.format(date); if 14 * (time_str.equals("星期天")){ System.out.println(time_str+",放假"); }else{ 15 * System.out.println(time_str+",上学"); } 16 */ 17 18 // 获取当天的时间 19 Calendar cal = Calendar.getInstance(); 20 // 把日历,按天,往前翻5天 21 cal.add(Calendar.DATE, -5); 22 23 int day_of_week = cal.get(Calendar.DAY_OF_WEEK); 24 // 1,7分别就是周末(星期6,星期天) 25 26 if (day_of_week == 1 || day_of_week == 7) { 27 System.out.println(day_of_week + ",放假"); 28 } else { 29 System.out.println(day_of_week + ",上学"); 30 } 31 } 32 33 }