Java String isEmpty() method with example

Java.lang.String.isEmpty() String method checks whether a String is empty or not. This method returns true if the given string is empty, else it returns false. The isEmpty() method of the String class is included in Java string since JDK 1.6. In other words, you can say that this method returns true if the length of the string is 0. 

Syntax of Java String isEmpty()

public boolean isEmpty();

Return Value

• It returns true if the string length is 0.
• Returns false otherwise.

Example

Input String1 : Hello_Gfg
Input String2 :
Output for String1 : false
Output for String2 : true

Examples of String isEmpty() method

Example 1:

Java program to illustrate the working of isempty().

false
true

Example 2:

A Java Program to show that an empty string is different from a blank String.

false
false
true

FAQ on Java String isEmpty()

Q1. Are Empty String and Null Strings the same?

Ans:

No, Empty Strings and Null Strings are not the same. Empty String supports isEmpty() whereas Null strings do not support isEmpty() method in Java. 

Example:

String s1="";
String s2=null;

Program to demonstrate the difference between them:

Java

// Java Program to check if // Empty String and Null String // are equal import java.io.*;    // Driver Class class GFG {     // main function     public static void main(String[] args)     {         String s1 = "";         String s2 = null;            // Chacking if Empty String is same as         // Null String         if (s1 == s2) {             System.out.println("Equal");         }         else {             System.out.println("Not Equal");         }     } }

Output

Not Equal

Q2. What is Blank String?

Ans:

Blank Strings are strings that contain only white spaces. isEmpty() method in itself is not sufficient but if used with trim() method can tell if the string is empty or not.

Example:

Java

// Java Program to demonstrate // Blank String import java.io.*;    // Driver Class class GFG {     // main function     public static void main(String[] args)     {         String s1 = " ";            if (s1.isEmpty())             System.out.println("It is Empty");         else             System.out.println("Not Empty");            if (s1.trim().isEmpty())             System.out.println("Using trim(): It is Empty");         else             System.out.println("Not Empty");     } }

Output

Not Empty
Using trim(): It is Empty