Check If a String Is Empty or Not in Java

In this article, we will learn how to check if a String is empty in Java. The isEmpty() method is used to check whether a given string does not contain characters.

Problem Statement

Given a string, write a Java program to determine if the string is empty.
Input

String str = ""

Output

String is empty: true

Steps to check if a string is empty

The following are the steps to check if a string is empty ?

• Create a string.
  
• Use the isEmpty() method to check whether the string has no characters.
  
• Print the result, which will be either true if the string is empty or false if it has characters.

Java program to check if a string is empty

The following is an example of checking if a string is empty 

public class Demo {
	public static void main(String[] args) {
		String str = "";
		System.out.println("String is empty: "+str.isEmpty());
	}
}

Output

String is empty: true

Code Explanation

String str = ""; is used in this example to define a string that contains no characters. The isEmpty() method checks if the string's length is zero. If the string is empty, the method returns true. We then print the result. If the string had contained any characters, the method would have returned false instead of true.