Or What is the null value in Java? I never understood that gradle, or whatever preceeded it, was a Java "package manager". More concise, better wording.Not to mention it shows as the top result on Google ☺Since Java 11 you can use isBlank() methid of String class which will check for both empty string or string consist of only white spaces. Don’t stop learning now. Get hold of all the important DSA concepts with the If you like GeeksforGeeks and would like to contribute, you can also write an article using Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. Featured on Meta // given a function func() that might return either a string or null String func() { return " hello "; } Which one of the following is better - … or. StringUtils.isEmpty(String str) - Checks if a String is empty ("") or null. This question is much better than its duplicate.

(as below)Yes, you're right @AlfazJikani. Where developers & technologists share private knowledge with coworkersProgramming & related technical career opportunities Well, the JVM specification says that null is the default value for all references, so it's not specifically tied to the String. Java空字符串与null的区别 1、类型.
Correct way to check for null or empty or string containing only spaces is like this:Google Guava also provides a similar, probably easier-to-read method: the latter considers a String which consists of spaces or special characters eg " " empty too. The following visualization gives a better sense about this concept. By using our site, you acknowledge that you have read and understand our

Note however that said method will return "null" for null references, while this method returns and empty String. “x” stores String reference. null表示的是一个对象的值，而不是一个字符串。例如声明一个对象的引用，String a=null。 In this case, the initialization statement declares a variables “x”. Looks like this is the case as I am using Tomcat inside the eclipse. Free 30 Day Trial What is null actually? To avoid NullPointerException in case the string is null, the method call should be preceded by a null check. answer from hari) is from Guava (com.google.common.base.Strings).And all for the low low cost of adding 2.7 MB to your build.

Strings in Java represents an array of characters. The compareTo() method of the String class two Strings (char by char) it also accepts null values. String.isEmpty() From Java 7 onward, the recommended approach is to use String.isEmpty() method to check for an empty string in Java. Approach: Get the String to be checked in str; so you can do something like (str != null && !str.isBlank()), ThanksJust FYI, IsEmpty() does not return true for a string containing only spaces.The negation of this answer is exactly how Guava's As a side note, the method name is a bit misleading. Quick Reference: 1) Convert String to String[] 1.1) String.split() Use split() method to split string into tokens by passing a delimiter (or regex) as method argument.
To preserve behavior use java.util.Objects.toString(myObject, "") as is also mentioned in other answers below. Given a string str, the task is to check if this string is null or not, in Java.Attention reader! I write the Java code which should work, and then start fixing dependency problems (if any) with the assistance of StackOverflow :). And actually, the specification doesn't mandate any concrete value encoding for null. Use […]

We use cookies to ensure you have the best browsing experience on our website. StringUtils.isBlank(String str) - Checks if a String is whitespace, empty ("") or null. I was saying to replace Strings (cf. So, StringUtils.isEmpty(" ") returns false - but StringUtils.isBlank(" ") returns true. the latter considers a String which consists of spaces or special characters eg " " empty too. This time round, after years of "ouches", I pre-empted it and put the "dependency in the package manager", before writing the code. Stack Overflow for Teams is a private, secure spot for you and The Overflow Blog It is null here. 1.2) Pattern.split() In Java, Pattern is the compiled representation of a regular expression.