Java – Check if a String is Blank

A string is said to be empty if the string contains no characters in it. In other words, a string is empty if its length is zero.

To check if a String str is empty, use String.isEmpty() method. Call isEmpty() method on the string str. If str is empty, then isEmpty() method returns true.

Java Program

public class Example {
	public static void main(String[] args) {
		String str = "";
		boolean result = str.isBlank();
		System.out.println("Is our string empty? " + result);
	}
}

Output

Is our string empty? true

If str length is not zero, then isEmpty() 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 empty? " + result);
	}
}

Output

Is our string empty? false

Conclusion

In this Java Tutorial, we learned how to check if a string is empty in Java.