java怎么把20161011转化为2016-10-11

Question

怎么把20161011转化为2016-10-11

String time = "20161011";
怎么转换成：
String time1 = "2016-10-11";

Answer 1

String x = "20161111";
System.out.println(x.replaceAll("(\\d{4})(\\d{2})(\\d{2})", "$1-$2-$3"));

Answer 2

String date = "20161011";
Date format = new SimpleDateFormat("yyyyMMdd").parse(date);
String dd = new SimpleDateFormat("yyyy-MM-dd").format(format);
System.out.println(dd);

Answer 3

String x = "20161111";
System.out.println(x.replaceAll("(\d{4})(\d{2})(\d{2})", "$1-$2-$3"));

Answer 4

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");