java格式化时间

Date类型转换成String:

Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String dBegin = sdf.format(date);

String类型转换成Date:

String start="2017-11-10";

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date dBegin = sdf.parse(start);