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Program to check if the String is Empty in Java

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  • Last Updated : 28 Jul, 2022
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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:

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 = "GeeksforGeeks";
        String str2 = "";
 
        System.out.println("Is string \"" + str1
                           + "\" empty? "
                           + isStringEmpty(str1));
        System.out.println("Is string \"" + str2
                           + "\" empty? "
                           + 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

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