Program to check if the String is Empty in Java

Program to check if the String is Empty in Java

Last Updated : 28 Jul, 2022

Given a string str, the task is to check if this string is empty or not, in Java. Examples:

Input: str = "" 
Output: True

Input: str = "GFG"
Output: False

Approach 1:

Get the String to be checked in str
We can simply check if the string is empty or not using the isEmpty() method of String class Syntax:

if (str.isEmpty())

Print true if the above condition is true. Else print false.

Below is the implementation of the above approach:

Java

// Java Program to check if
// the String is empty in Java

class GFG {

    // Function to check if the String is empty
    public static boolean isStringEmpty(String str)
    {

        // check if the string is empty or not
        // using the isEmpty() method
        // and return the result
        if (str.isEmpty())
            return true;
        else
            return false;
    }

    // Driver code
    public static void main(String[] args)
    {
        String str1 = &quot;GeeksforGeeks&quot;;
        String str2 = &quot;&quot;;

        System.out.println(&quot;Is string \&quot;&quot; + str1
                           + &quot;\&quot; empty? &quot;
                           + isStringEmpty(str1));
        System.out.println(&quot;Is string \&quot;&quot; + str2
                           + &quot;\&quot; empty? &quot;
                           + isStringEmpty(str2));
    }
}

Output:

Is string "GeeksforGeeks" empty? false
Is string "" empty? true

Approach 2: Using length() method

If the length of the string is zero then the string is empty.

Java

// Java Program to check if
// the String is empty in Java

class GFG{
    public static void main(String[] args)
    {
        String str1 = "GeeksforGeeks";
        String str2 = "";
        boolean res1=false;
        boolean res2=false;
        if(str1.length()==0){
            res1=true;
        }
        if(str2.length()==0){
            res2=true;
        }
        System.out.println("Is string \"" + str1+ "\" empty? "+ res1);
        System.out.println("Is string \"" + str2+ "\" empty? "+ res2);
    }
}

Output

Is string "GeeksforGeeks" empty? false
Is string "" empty? true

Program to check if the String is Empty in Java

C

code_r

Improve

Article Tags :

Practice Tags :

Similar Reads

Program to check if a String in Java contains only whitespaces

Given a string str, the task is to check if this string contains only whitespaces or some text, in Java. Examples: Input: str = " " Output: True Input: str = "GFG" Output: False Approach: Get the String to be checked in str We can use the trim() method of String class to remove the leading whitespac

Program to check if first and the last characters of string are equal

We are given a string, we need to check whether the first and last characters of the string str are equal or not. Case sensitivity is to be considered. Examples : Input : university Output : Not Equal Explanation: In the string "university", the first character is 'u' and the last character is 'y',

Compare two Strings in Java

String in Java are immutable sequences of characters. Comparing strings is the most common task in different scenarios such as input validation or searching algorithms. In this article, we will learn multiple ways to compare two strings in Java with simple examples.Example:To compare two strings in

Java String isEmpty() Method with Example

In Java, the String isEmpty() method checks if a string is empty (length is zero). This method returns true if the string is empty and false otherwise. It is useful for validating strings in our applications.In this article, we will learn how to use the isEmpty() method in Java along with examples t

Check if a String Contains only Alphabets in Java

In Java, to check if a string contains only alphabets, we have to verify each character to make sure it falls within the range of valid alphabetic characters. There are various ways to check this in Java, depending on requirements.Example: The most common and straightforward approach to validate if

StringWriter equals() method in Java with Example

The Java.io.StringWriter.equals(Object obj) method of StringWriter class in Java is used to check whether the two instances of StringWriter are equal or not. It returns a boolean stating whether they are equal or not. Signature: public boolean equals(StringWriter second_StringWriter) Syntax: first_S

Null Pointer Exception in Java

A NullPointerException in Java is a RuntimeException. It occurs when a program attempts to use an object reference that has the null value. In Java, "null" is a special value that can be assigned to object references to indicate the absence of a value.Reasons for Null Pointer ExceptionA NullPointerE

Check if a String Contains only Alphabets in Java using Regex

Regular Expressions or Regex is an API for defining String patterns that can be used for searching, manipulating, and editing a text. It is widely used to define a constraint on strings such as a password. Regular Expressions are provided under java.util.regex package. For any string, here the task

String Handling with Apache Commons' StringUtils Class in Java

The Apache Commons Lang library is a popular third-party library for working with Strings in Java, and the StringUtils class is a key part of this library. StringUtils is a utility class that provides a wide range of String manipulation methods that are not available in the standard Java String clas

Check length of a string is equal to the number appended at its last

Given a string that (may) be appended with a number at last. You need to find whether the length of string excluding that number is equal to that number. For example for "helloworld10", answer is True as helloworld consist of 10 letters. Length of String is less than 10, 000. Examples : Input: str =