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 = "Lazyroar"; String str2 = null; System.out.println("Is string [" + str1 + "] null? " + isStringNull(str1)); System.out.println("Is string [" + str2 + "] null? " + isStringNull(str2)); }} |
Output:
Is string [Lazyroar] null? false Is string [null] null? true
