Program to check if the String is Null in Java

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

Examples:

Input: str = null 
Output: True

Input: str = "GFG"
Output: False

Approach:

• Get the String to be checked in str
• We can simply compare the string with Null using == relational operator.
  Syntax:
  
  

  if(str == null)
  

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

Below is the implementation of the above approach:

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

class GFG {

    // Function to check if the String is Null
    public static boolean isStringNull(String str)
    {

        // Compare the string with null
        // using == relational operator
        // and return the result
        if (str == null)
            return true;
        else
            return false;
    }

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

        System.out.println("Is string [" + str1
                           + "] null? "
                           + isStringNull(str1));
        System.out.println("Is string [" + str2
                           + "] null? "
                           + isStringNull(str2));
    }
}

Output:

Is string [GeeksforGeeks] null? false
Is string [null] null? true