Exceptions NumberFormatException - if the string is not a valid representation of a number. Val result: Long? = strVal. JS Native 1.0 fun String.toDouble(): Double (Common source) (JVM source) (JS source) (Native source) Parses the string as a Double number and returns the result. It will return null if the string value is not valid and a Long value if the string value is valid.Ĭode example using a valid String value // define a string The best part of using this function is it will not throw an error if the string value is not valid. Output 901 Convert to Long using toLongOrNull() functionĪ String can also be converted to a Long value using the toLongorNull() function. The resulting long value is returned, exactly as if the argument and the radix 10 were given as arguments to the parseLong(, int) method. This is a String method that provides the Long value from a Kotlin String. Kotlin's String.toLong() is equivalent to Java's Long.parseLong(String): Parses the string argument as a signed decimal long. str.toUpperCase () toUpperCase () function returns a new string created from converting all the characters of the calling string to uppercase. Call toUpperCase () function on the given String object str. In single threaded environment * converting String to date is easy because you can use SimpleDateFormat * class without worrying.Use String.toLong() to convert a String to LongĪs described in the main code example, we are using the toLong() function to convert a String to Long. To convert a given string to an uppercase string in Kotlin, you can use String.toUpperCase () function. ** * String to Date Example in Java Multi-threading. This DateFormat object is created with the pattern "dd/MM/yyy", you can choose any format as you like, please refer to the cheat sheet given in this blog post to see various date formatting options. Here we have created a method called toDate() which returns a date object when we pass String to it. In this program, I have created a nested static class DateUtils, which holds a static final DateFormat object. // Java String name 'Joe' ('Hello, ' + name) ('Your name is ' + name. Here is a complete example of converting String to Date on a Multi-threading Java Program. There are mainly two ways to use SimpleDateFormat properly in a concurrent application, either synchronize the access to DateFormat object or use ThreadLocal variable.Įarlier we have seen how to make SimpleDateFormat thread-safe, and in this tutorial, we will learn how to use the synchronized keyword for making DateFormat thread-safe. val touchStatus 'Action: actionString Index: actionIndex ID: id X: x Y. That's why I wrote this post to show how to convert String to Date correctly in a Java multi-threading environment. Developing Android Apps Using Android Studio 2022.1.1 and Kotlin Neil Smyth. mutability, not intuitive, the most obvious problem with formatting date in Java is SimpleDateFormat not being thread-safe. Apart from several design mistakes of Date class e.g. To parse the string to a Long data type, we use the. Conversion to other data types is quite similar. We’ll use conversion of Long as an example to discuss parsing with string. It may take another 5 years before you start using lambda expressions and Stream API. Getting ready You just need a Kotlin editor to write and run your code. Many enterprise application is still running on Java 5 and Java 6, forget about JDK 7 or 8. Though Joda Date and Time API is always there and now Java 8 also got a new date and time API, many of us don't have the luxury to use it in production.
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