(For this type you should definitely add isEmpty(Map map) to benefit from its isEmpty method. This would be 'sensible' for many configurations, I expect.I am writing a utility method which can check for empty and null string, or collection or an object or any general types - public static boolean isEmpty(Object obj), which won't match your conditions of emptiness. However, let’s go by the definition of each to draw a line of difference. If you do, you can use String.isEmpty () instead of this method, and you wont need special null-safe forms of methods like String.toUpperCase () either. In Java, it’s very easy to confuse a null, empty or a blank string for beginners. Consider normalizing your string references with nullToEmpty (). I have an example here, where I choose to return null if there is no configured URI, or throw an exception if there is a configured URI and that URI is not a valid value. Returns true if the given string is null or is the empty string. It seems, I am not able to find what is the actual difference between them. Example: str1.length()) Example: str1.equals()) if string was. What is the difference between null and the '' (empty string) I have written some simple code: String a '' String b null (a b) // false (a.equals (b)) // false Both statements return false. If the user doesnt input anything, the input fields value will be an empty string. Check if a string is empty or null or not in Java means the value of the string is null. For example, you have a form where a user can input their name. Its important to differentiate between the two, as they are not the same. However, a Java String that might only contain. An empty string is a string that has no characters, while a null string is a string that has no value assigned to it. even if a regex appears that it will match, it is still not the correct solution -) Solution An empty Java String is considered as the not null String that contains zero characters, meaning its length is 0. There is not a correct regex for matching URL's. for example, your pattern will return the following: from myhost/consolidate from myhost:8080 from from Each of the above input values will produce unexpected results. but, your pattern will match a lot of things which I would consider to be unexpected. ![]() it appears that you want your pattern to match the HTTP 'host' against which you have the 'consolidate' path.
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