根据“年月日”字符串，判断这一天是星期几

需求：页面传来一个年月日的字符串，根据这个字符串判断这一天是星期几

代码：

public class TestCalender {@Testpublic void testCalender() throws Exception{SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");   Calendar c = Calendar.getInstance();   c.setTime(format.parse("2016-3-21"));  //判断方法 int dayForWeek = 0;   if(c.get(Calendar.DAY_OF_WEEK) == 1){    dayForWeek = 7;   }else{    dayForWeek = c.get(Calendar.DAY_OF_WEEK) - 1;   }  System.out.println(dayForWeek);}}

结果：1