一年的第多少周+一个月的第多少天+一周的第多少天

末蓝、 2023-02-21 04:46 3阅读 0赞

package cn.mybatis.dao.impl;
    
    import org.junit.Test;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    
    /**
     * @ClassName TimeTest
     * @Description TODO
     * @Author 张大仙
     * @Date 2020/6/24  18:03
     * @Version 1.0
     **/
    
    
    public class TimeTest {
        
    
        @Test
        public void javaTime() throws ParseException {
        
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    
            Date date = format.parse("2020-05-18");
    //        Date date = new Date();
            Calendar calendar = Calendar.getInstance();
            calendar.setFirstDayOfWeek(Calendar.MONDAY);
            calendar.setTime(date);
            int weekOfYear = calendar.get(Calendar.WEEK_OF_YEAR); //一年的多少周
            int dataMonthDay = calendar.get(Calendar.DAY_OF_MONTH); //一个月的第多少天
            int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK); //一周的第几天
            //返回值为1的话  为周日
            //返回值为7的话  为周六
            if (dayOfWeek==1){
        
                dayOfWeek = 7;
            }else {
        
                dayOfWeek = dayOfWeek - 1;
            }
    
            System.out.println("一年的第多少周：" + weekOfYear);
            System.out.println("一个月的第多少天：" + dataMonthDay);
            System.out.println("一周的第多少天：" + dayOfWeek);
    
        }
    }