This method is best, so you should do the following: Use Long.parseLong () as it returns a long primitive, not a wrapper.
#CONVERT STRING TO LONG IN JAVA HOW TO#
How to convert String time to Long milliseconds in Java. matches now contains all Longs found in the stringOf course that would require another iteration to turn the List into a Long or long, but the List should be fine for most cases.īut the initial question was: "How do i convert string array into long array in java?" and that's impossible without a second iteration (I count recursion as iterating in this case). The correct way to convert a String to long in Java is to use the parseLong (String x) method of the Long wrapper class. For ex., I have the following value: Time.valueOf('2:00:00') how should I convert it to Long (to be stored in SQLite database as Real) is used. String match = input.substring(index, matcher.start()) Matcher matcher = pattern.matcher(input) This splitting a string into longs would be something like this (code based on Pattern.split):
#CONVERT STRING TO LONG IN JAVA CODE#
Conclusion is that youre running a different code than you think youre running - parsing the string as long should work without issues. And I doubt that using a Pattern / Matcher combination would be slower - because that's just what String.split uses - it delegates to Pattern.split which uses a Matcher. However, youre claiming that youre having the problem with this code: long timeMillisLong.parseLong (time) which clearly isnt true, as per stack trace. When you convert a long to a string, you are creating an array of ASCII characters that would represent this number. for int you int i 3423 String str str str.valueOf (i) so how do you go the other way but with long. A char is typically 1 byte, while a long is typically 8 bytes. How to convert String to long in Java (10 answers) Closed 7 years ago. I agree that splitting and parsing in one go would remove the need for a second iteration. The only real difference between a char and a long is the data size. Now, of course, whether this saves any time, is unclear. Instead of using split(), you can use find(), to get each "long" string element, in order to convert to a long - in one pass. Technically, there is a way to do without iterating through the array - you can skip generating the array in the first place.
You already iterated once through the string, in order to split it into an array. Whatever solution you use, in the end you will still need to change each separate string element into a long.Ī more complicated answer. To convert string to a long, we use Long.parseLong() method provided by the Long class. not only lnog can convert into int,any type of class extends Number can convert to other Number type in general,here I will show you how to convert a long to int,other type vice versa. Without iterating the array,Is there is any other way to do it. Converting String to Long in Java using Long.parseLong(). In java ,there is a rigorous way to convert a long to int.
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