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"));