Write code to parse a string to Calendar with specified separator
//package com.book2s; import java.util.Calendar; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static void main(String[] argv) { String str = "2019-11-10"; String separator = "-"; System.out.println(str2calendar(str, separator)); }/*from ww w. j av a 2s . c om*/ public static Calendar str2calendar(String str, String separator) { if (isEmpty(str)) return null; String[] strList = str.split(separator); if (strList.length != 3 || !isNumber(strList[0]) || !isNumber(strList[1]) || !isNumber(strList[2])) return null; int year = Integer.parseInt(strList[0]); int month = Integer.parseInt(strList[1]); int day = Integer.parseInt(strList[2]); Calendar result = Calendar.getInstance(); result.set(year, month - 1, day); return result; } public static boolean isEmpty(CharSequence s) { return s == null || s.length() == 0; } public static boolean isNumber(String numStr) { if (isEmpty(numStr)) return false; Pattern pattern = Pattern.compile("[0-9]*"); Matcher match = pattern.matcher(numStr); return match.matches(); } }