Java gets the Monday date of the week that the date is in by passing in a specified date, in the format of date: 2016-07-30

Java gets the Monday date of the week that the date is in by passing in a specified date, in the format of date: 2016-07-30

private  static  void  convertweekdate (date time)  {                            simpledateformat sdf= new  SimpleDateFormat ("Yyyy-mm-dd"); //Set time format               calendar cal = calendar.getinstance ();              Cal.settime (time);             //Judge whether the date to be calculated is Sunday, if it is minus one day to calculate Saturday, otherwise there will be problems, calculate to the next week to go               int  Dayweek = cal.get (Calendar.day_of_week); Get the current date is the first day of one weeks              if (1  == dayweek)  {               Cal.add (calendar.day_of_ month, -1);            }              System.out.println ("To calculate the date is:" +sdf.format (Cal.gettime ())); //output to calculate date              Cal.setfirstdayofweek (Calendar.monday); Set the first day of the one week, according to China's habit the first day of one weeks is Monday              int  days  = cal.get (Calendar.day_of_week); Get the current date is the day of one weeks              cal.add (calendar.date,  cal.getfirstdayofweek ()-day); According to the rules of the calendar, subtract the difference between the current date and the first day of the one-week