java string isempty - Brave Search

Best way to verify string is empty or null

stackoverflow.com › questions › 32567208 › best-way-to-verify-string-is-empty-or-null

Useful method from Apache Commons:

 org.apache.commons.lang.StringUtils.isBlank(String str)

https://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/StringUtils.html#isBlank(java.lang.String)

Answer from puczo on Stack Overflow

docs.oracle.com › javase › 8 › docs › api › java › lang › String.html

String (Java Platform SE 8 )

October 20, 2025 - List<String> strings = new LinkedList<>(); strings.add("Java");strings.add("is"); strings.add("cool"); String message = String.join(" ", strings); //message returned is: "Java is cool" Set<String> strings = new LinkedHashSet<>(); strings.add("Java"); strings.add("is"); strings.add("very"); strings.add("cool"); String message = String.join("-", strings); //message returned is: "Java-is-very-cool" Note that if an individual element is null, then "null" is added. ... delimiter - a sequence of characters that is used to separate each of the elements in the resulting String

stackoverflow.com › questions › 32567208 › best-way-to-verify-string-is-empty-or-null

java - Best way to verify string is empty or null - Stack Overflow

Useful method from Apache Commons:

 org.apache.commons.lang.StringUtils.isBlank(String str)

https://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/StringUtils.html#isBlank(java.lang.String)

To detect if a string is null or empty, you can use the following without including any external dependencies on your project and still keeping your code simple/clean:

if(myString==null || myString.isEmpty()){
    //do something
}

or if blank spaces need to be detected as well:

if(myString==null || myString.trim().isEmpty()){
    //do something
}

you could easily wrap these into utility methods to be more concise since these are very common checks to make:

public final class StringUtils{

    private StringUtils() { }   

    public static bool isNullOrEmpty(string s){
        if(s==null || s.isEmpty()){
            return true;
        }
        return false;
    }

    public static bool isNullOrWhiteSpace(string s){
        if(s==null || s.trim().isEmpty()){
            return true;
        }
        return false;
    }
}

and then call these methods via:

if(StringUtils.isNullOrEmpty(myString)){...}

and

if(StringUtils.isNullOrWhiteSpace(myString)){...}

Discussions

Question about .isEmpty() and .contains("")

isEmpty() checks for string length and returns true if it's zero, while contains("") will return true unless the string isn't initialized/null. For checking empty strings or strings containing only whitespace you could also use the method isBlank(). Hope this helps! More on reddit.com

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New rule to suggest "string".length() == 0 -> "string".isEmpty()

There should be a new rule to suggest ... !"string".isEmpty() and "string".trim().length() == 0 to "string".isBlank() and "string".trim().length() > 0 to !"string".isBlank() And please add a good quick fix. It’s so easy to indroduce regressions with negation. On a side node this quick fix should also be applied java:S1... More on community.sonarsource.com

community.sonarsource.com

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September 7, 2023

In Java, should I use (String ) isEmpty() or isBlank() when checking an XML object for an empty value?

What behavior do you want if the xml parser emits " " as the config value? More on reddit.com

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New Methods on Java Strings With JDK 11

Maybe one day they will even add string padding utils to the stdlib. More on reddit.com

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w3schools.com › java › ref_string_isempty.asp

Java String isEmpty() Method

The isEmpty() method checks whether a string is empty or not. This method returns true if the string is empty (length() is 0), and false if not. ... If you want to use W3Schools services as an educational institution, team or enterprise, send ...

reddit.com › r/learnjava › question about .isempty() and .contains("")

r/learnjava on Reddit: Question about .isEmpty() and .contains("")

July 25, 2023 -

SORRY

I JUST REALISED I MADE A MISTAKE I WANTED TO ASK ABOUT EQUALS("") BUT AT THE SAME TIME I WAS FIGHTING WITH ANOTHER EXCERCISE IN WHICH I HAD TO USE CONTAINS() METHOD AND THIS MESSED UP MY THOUGHTS SORRY FOR WASTING YOUR TIME :/

but still i was able to get some usefull info about contains method so it wasn't as much wasted effort but still sorry

Hi i'm doing(or atleast trying to do) mooc.fi java part 1 course and there in some exercises is required to check for empty input.

So there is my question what is difference between .isEmpty() and .Equals("") because i like to use the first one but in suggested solutions always is used ".Equals("") and i'm wondering is there any rule for using .isEmpty(), maybe it's the matter of optimalization etc. or maybe both are as good

I know it can be stupid question but it's better to ask that and get rid of bad habits in writing code as soon as possible :D

In advance thanks for answers

P.S i hope everything is easy to understand unfortunately my english is still far from good :D

isEmpty() checks for string length and returns true if it's zero, while contains("") will return true unless the string isn't initialized/null. For checking empty strings or strings containing only whitespace you could also use the method isBlank(). Hope this helps!

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geeksforgeeks.org › java › java-string-isempty-method-example

Java String isEmpty() Method with Example - GeeksforGeeks

November 20, 2024 - In Java, the String isEmpty() method checks if a string is empty (length is zero). This method returns true if the string is empty and false otherwise.

baeldung.com › home › java › java string › difference between string isempty() and isblank()

Difference Between String isEmpty() and isBlank() | Baeldung

December 2, 2025 - The above table summarizes that if the String doesn’t contain any character, both methods return true. Additionally, the escape sequences \t, \n, \r, \f, and \s are considered whitespace characters, so only isBlank() returns true. In contrast, isEmpty() returns false for all of them. Finally, for any other character different from the ones shown in the table, both methods return false. Before Java 11, developers typically used the combination of String.trim() and String.isEmpty() to validate that a text contains only whitespace characters.

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medium.com › @AlexanderObregon › java-string-isempty-method-explained-a731faf082aa

Java String isEmpty() Method Guide | Medium

June 23, 2024 - The isEmpty() method is part of the String class in Java, which is fundamental for handling and manipulating strings. This method provides a simple way to check whether a string is empty, meaning it contains no characters.

baeldung.com › home › java › java string › checking for empty or blank strings in java

Checking for Empty or Blank Strings in Java | Baeldung

January 8, 2024 - The most convenient way is to use Apache Commons Lang, which provides helpers such as StringUtils.isBlank. If we want to stick to plain Java, we can use a combination of String#trim with either String#isEmpty or String#length.

docs.vultr.com › java › standard-library › java › lang › String › isEmpty

Java String isEmpty() - Check If Empty | Vultr Docs

December 17, 2024 - The isEmpty() method in Java is a straightforward and efficient way for checking whether a given string has a length of zero, which means it is an empty string. This method is part of the String class in Java's standard library, making it readily ...

Sonar Community

community.sonarsource.com › rules and languages › new rules / language support

New rule to suggest "string".length() == 0 -> "string".isEmpty() - New rules / language support - Sonar Community

September 7, 2023 - There should be a new rule to suggest ... !"string".isEmpty() and "string".trim().length() == 0 to "string".isBlank() and "string".trim().length() > 0 to !"string".isBlank() And please add a good quick fix. It’s so easy to indroduce regressions with negation. On a side node this quick fix should also be applied java:S1...

tutorialspoint.com › home › java/lang › java string isempty method

Java String isEmpty Method

September 1, 2008 - The Java String isEmpty() method is used to check whether the current string is empty or not. The method returns a boolean value which is true if and only if the string is empty; false otherwise.

reddit.com › r/askprogramming › in java, should i use (string ) isempty() or isblank() when checking an xml object for an empty value?

r/AskProgramming on Reddit: In Java, should I use (String ) isEmpty() or isBlank() when checking an XML object for an empty value?

September 26, 2022 -

I have some config file and it is deployed in many regions. Some regions have certain requirements for example lets say one region needed a username and password (basic auth). The current setup is that each deployment has it's own config file and only the instances where it is needed are these values included in the respective config.xml file.

So I have in my Java code some logic that says

'if this element is in the XML, set the corresponding variable with its value, if not do nothing'

So when I'm trying to see if that value is present or if the tag is empty/blank, which String utility should I use to check?

example code (default option left open as empty string):

if (my_config.getString(USER_ID_ELEMENT, "") != null
    & my_config.getString(PASSWORD_ELEMENT, "") != null) {
		my_userId = m_config.getString(USER_ID_ELEMENT, "");
		my_password = m_config.getString(PASSWORD_ELEMENT, "");

Here I'm checking if it is not null, but I don't think it's a very good test since I don't know if an empty XML tag is blank or is empty (i think null isn't even an option)?

What behavior do you want if the xml parser emits " " as the config value?

Blank and empty are not the same thing. Empty means "" and only "". Blank means "", " ", " ", and so on. Which you use depends on your use case, but usually its safest to go with isBlank combined with a null check.

techvidvan.com › tutorials › java-string-isempty-method

Java String isEmpty() Method with Examples - TechVidvan

July 8, 2024 - Java isEmpty() method is a powerful tool that allows developers to efficiently check if a string is empty or null, simplifying the process of handling strings in programming.

programiz.com › java-programming › library › string › isempty

Java String isEmpty()

class Main { public static void main(String[] args) { String str1 = "Java Programming"; String str2 = ""; System.out.println(str1.isEmpty()); // false System.out.println(str2.isEmpty()); // true } }

medium.com › @vino7tech › comparison-of-isempty-and-isblank-methods-in-java-with-test-cases-84c54525d73b

Comparison of isEmpty() and isBlank() Methods in Java with Example | by Vinotech | Medium

October 1, 2024 - The isEmpty() method checks whether a string contains any characters.

scaler.com › home › topics › isempty() in java

Java String isEmpty - Scaler Topics

January 4, 2024 - ... The First string i.e "Scaler" ... The String class of java has the isEmpty() method that is used to check whether the given string is empty or not....

codecademy.com › docs › java › strings › .isempty()

Java | Strings | .isEmpty() | Codecademy

March 4, 2023 - The .isEmpty() method returns true if a string has no content. It returns false if the string has content. ... Looking for an introduction to the theory behind programming? Master Python while learning data structures, algorithms, and more!

coderanch.com › t › 203109 › java › Efficient-Check-Empty-String

Efficient Way to Check Empty String (Performance forum at Coderanch)

We use (string != null || string.trim().length() == 0) to check if string is empty. Calling a method which actually iterate through string and checks for non-whitespace character .

docs.oracle.com › en › java › javase › 17 › docs › api › java.base › java › lang › String.html

String (Java SE 17 & JDK 17)

January 20, 2026 - The class String includes methods for examining individual characters of the sequence, for comparing strings, for searching strings, for extracting substrings, and for creating a copy of a string with all characters translated to uppercase or to lowercase. Case mapping is based on the Unicode Standard version specified by the Character class. The Java language provides special support for the string concatenation operator ( + ), and for conversion of other objects to strings.

baeldung.com › home › java › java string › java string.isempty()

Java.String.isEmpty() | Baeldung

April 11, 2025 - The method isEmpty() is a convenience method that checks if the size of a String is equal to zero.