Java 25 (LTS) reference · String Methods

Java String isBlank() Method

Return true if the string is empty or contains only whitespace. isEmpty() is true only for "".

Java 25 (LTS) Since Java 11

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Syntax

string.isBlank()

Return value

true or false.

Examples

isBlank() vs isEmpty()

public class Main {
    public static void main(String[] args) {
        System.out.println("".isBlank());
        System.out.println("   ".isBlank());
        System.out.println("   ".isEmpty());
        System.out.println(" a ".isBlank());
    }
}

Output

true
true
false
false

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A default for blank input

public class Main {
    public static void main(String[] args) {
        String name = "  ";
        String display = name.isBlank() ? "Anonymous" : name.strip();
        System.out.println(display);
    }
}