Check empty string

In this example we shall show you how to check if a String is empty. We are using the org.apache.commons.lang3.StringUtils class, that provides operations on String that are null safe.. To check if a String is empty one should perform the following steps:

  • Create a few String objects.
  • Use the isBlank(String s) method to check if a String contains text.
  • Use the isEmpty(String s) method to check if a String contains text, too.
  • You can also use the isBlank(String s) and isEmpty(String s) methods,

as described in the code snippet below.  

package com.javacodegeeks.snippets.core;
import org.apache.commons.lang3.StringUtils;

public class emptyStringExample {
    public static void main(String[] args) {
    	String string1 = null;

  String string2 = "";

  String string3 = "ttt";

  String string4 = "JavaCodegeeks";

  System.out.println("string1 blank = " + StringUtils.isBlank(string1));

  System.out.println("string2 blank = " + StringUtils.isBlank(string2));

  System.out.println("string3 blank = " + StringUtils.isBlank(string3));

  System.out.println("string4 blank = " + StringUtils.isBlank(string4));

  System.out.println("string1 not blank = " + StringUtils.isNotBlank(string1));

  System.out.println("string2 not blank = " + StringUtils.isNotBlank(string2));

  System.out.println("string3 not blank = " + StringUtils.isNotBlank(string3));

  System.out.println("string4 not blank = " + StringUtils.isNotBlank(string4));

  System.out.println("string1 empty = " + StringUtils.isEmpty(string1));

  System.out.println("string2 empty = " + StringUtils.isEmpty(string2));

  System.out.println("string3 empty = " + StringUtils.isEmpty(string3));

  System.out.println("string4 empty = " + StringUtils.isEmpty(string4));

  System.out.println("string1 not empty = " + StringUtils.isNotEmpty(string1));

  System.out.println("string2 not empty = " + StringUtils.isNotEmpty(string2));

  System.out.println("string3 not empty = " + StringUtils.isNotEmpty(string3));

  System.out.println("string4 not empty = " + StringUtils.isNotEmpty(string4));


string1 blank = true
string2 blank = true
string3 blank = true
string4 blank = false
string1 not blank = false
string2 not blank = false
string3 not blank = false
string4 not blank = true
string1 empty = true
string2 empty = true
string3 empty = false
string4 empty = false
string1 not empty = false
string2 not empty = false
string3 not empty = true
string4 not empty = true

This was an example of how to check if a String is empty in Java.

Want to know how to develop your skillset to become a Java Rockstar?

Join our newsletter to start rocking!

To get you started we give you our best selling eBooks for FREE!


1. JPA Mini Book

2. JVM Troubleshooting Guide

3. JUnit Tutorial for Unit Testing

4. Java Annotations Tutorial

5. Java Interview Questions

6. Spring Interview Questions

7. Android UI Design


and many more ....


Receive Java & Developer job alerts in your Area

I have read and agree to the terms & conditions


Ilias Tsagklis

Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.
Notify of

This site uses Akismet to reduce spam. Learn how your comment data is processed.

1 Comment
Newest Most Voted
Inline Feedbacks
View all comments
5 years ago

The code snippet output for the isBlank and isNotBlank methods is slightly incorrect.
Here is what their two outputs for string3 should be:

The output of ‘string3 blank = ‘ false.
The output of ‘string3 not blank = ‘ true.

Back to top button