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 whitespaces in the string.
Syntax:str.trim()
- Then we can use the isEmpty() method of String class to check if the resultant string is empty or not. If the string contained only whitespaces, then this method will return true
Syntax:str.isEmpty()
- Combine the use of both methods using Method Chaining.
str.trim().isEmpty();
- 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 not all whitespaces class GFG { // Function to check if the String is all whitespaces public static boolean isStringAllWhiteSpace(String str) { // Remove the leading whitespaces using trim() // and then check if this string is empty if (str.trim().isEmpty()) return true; else return false; } // Driver code public static void main(String[] args) { String str1 = "Lazyroar"; String str2 = " "; System.out.println("Is string [" + str1 + "] only whitespaces? " + isStringAllWhiteSpace(str1)); System.out.println("Is string [" + str2 + "] only whitespaces? " + isStringAllWhiteSpace(str2)); }} |
Output:
Is string [Lazyroar] only whitespaces? false Is string [ ] only whitespaces? true
