How to check if a string is empty in Java

In this tutorial, we are going to learn about how to check if a string is empty or not in Java.

Checking the empty string

To check if a given string is empty or not, we can use the built-in String.isEmpty() method in Java.

The String.isEmpty() method returns true if a given string is empty string (""), otherwise it returns false if a string is not empty.

Here is an example:

public class Main
{
    public static void main(String[] args) {
     String str = "";

        if(str.isEmpty()){
             System.out.println("str is empty");
        }else{
             System.out.println("str is not empty");
      }
   }
}

Output:

"str is empty"

Similarly, we can also use the length() method to check if a string is empty or not in Java.

public class Main
{
  public static void main(String[] args) {
     String str = "";
     int n = str.length();

     if (n == 0) {
          System.out.println("str is empty");
     }else{
         System.out.println("str is not empty");
     }
  }
}

Note: The length() method returns the total number of characters in a specified string, it returns 0 for the empty string.