Java Check if a String is Blank
A string is said to be blank if it is empty or contains only white space characters like single space, new line, return feed, tab space, etc.
To check if a String str
is blank, use String.isBlank() method. Call isBlank() method on the string str
. If str
is blank, then isBlank() method returns true.
Note: We can use String.isBlank() method only from Java version 11.
Java Program
public class Example { public static void main(String[] args) { String str = "\t \n \r"; boolean result = str.isBlank(); System.out.println("Is our string blank? " + result); } }
Output
Is our string blank? true
Empty string is a blank string.
Java Program
public class Example { public static void main(String[] args) { String str = ""; boolean result = str.isBlank(); System.out.println("Is our string blank? " + result); } }
Output
Is our string blank? true
If str
contains any character other than white space characters, then isBlank() method returns false.
Java Program
public class Example { public static void main(String[] args) { String str = "hello"; boolean result = str.isBlank(); System.out.println("Is our string blank? " + result); } }
Output
Is our string blank? false
Conclusion
In this Java Tutorial, we learned how to check if a string is blank in Java.