If you want to check whether the String is null or empty both then you can do it as shown in the following example. It can only store references to instances of java.util.Date.If you make it null means that it is not referring any instance of java.util.Date.. You have tried date2=""; what you mean to do by this statement you want to reference the instance of String to a variable that is suppose to store java.util . Example shows how check if a string or charSequence is not empty and not null by using string length, Guava Strings.isNullOrEmpty and Apache StringUtils.isNotEmpty . java - Writing a generic performance efficient isEmpty method which can ... And simply called our isEmptyOrNull method to check a string for empty and Null. object oriented - Is it better to return NULL or empty values from ... Output. If you want a variable that can be null (for example if not initialized), you must use Long (look the case). To loosely check if the variable is null, use a double equality operator(==). How to check if a DateTime field is not null or empty? Using List.isEmpty () method. This method accepts an integer as a parameter and returns true if the given string is empty, or false if it is not. Result will be a boolean. C#'s String.IsNullOrEmpty returns true if the given string is null or empty string, but false for "\t \r\n". 1. What is "not in" operator in Python? We are using isEmpty() method of HashMap class to perform this check. java - how to check if a string is null — oracle-tech

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