If you didnât provide a locale, the formatter would use the JVMâs locale setting, which may work in many cases, and then unexpectedly fail one day when you run your app on a device with a different locale setting. I took December to be English, there are other languages where that month is called the same, so please choose the proper locale yourself. atStartOfDay(ZoneId.of("Asia/Karachi"))Īs expected this gives a slightly different result: 1355252400000Īnother point to note, remember to supply a locale to your DateTimeFormatter. If you require the time at start of day in some specific time zone, specify that time zone instead of UTC, for example. long l 12345L String str Long.toString (l) (str) //prints 12345. The correct way to convert a String to long in Java is to use the parseLong (String x) method of the Long wrapper class. Below code snippet shows you how to use it to convert long to string in java. Long millisecondsSinceEpoch = LocalDate.parse(stringDate, dateFormatter) In addition, this class provides several methods for converting a long to a String and a String to a long, as well as other constants and methods useful. Long.toString () We can use Long class toString method to get the string representation of long in decimal points. = DateTimeFormatter.ofPattern("d-MMMM-uuuu", Locale.ENGLISH) If you want to have huge number you can use BigDecimal easily. If your String value is withing the range of Long, you can use Long.parseLong() with out this kind of hard ways. If String is greater than Long.MAXVALUE means that is no more a Long value. Because Java automatically unboxes a Long to a long, writing l -> l as the lambda expression works. The argument to mapToLong is a ToLongFunction, which has a long as the result type. We call mapToLong on it to get a LongStream. To obtain these: DateTimeFormatter dateFormatter I am not sure what you trying to achieve here. We convert the List into a Stream.The characters in the string must all be decimal digits, except that the first character may be a minus (-) sign for negative numbers and a plus (+) sign for positive numbers. You can use it on Android through the ThreeTenABP, see this question: How to use ThreeTenABP in Android Project.įor most purposes I recommend using the milliseconds since the epoch at the start of the day in UTC. Using Long.valueOf (String) The Long.valueOf () method parses the input string to a signed decimal long type. java.time, the modern Java date and time API also known as JSR-310, is so much nicer to work with. I would like to convert those numbers to a List of Long objects ie List< Long>. Why the answers posted in 2016 also use the then long outdated classes SimpleDateFormat and Date is a bit more of a mystery to me. Assume I have a set of numbers like 1,2,3,4,5,6,7 input as a single String. In 2012 when the question was asked, the answers also posted back then were good answers. rounding small values to zero and producing long strings for large values, e. Itâs about time someone provides the modern answer to this question. Converting a float to a string in Java is useful for a variety of reasons.
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