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Program to check if the String is Null in Java

  • Difficulty Level : Basic
  • Last Updated : 22 Jan, 2020
Geek Week

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

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