Tests if the specified string is empty or contains only white spaces. This is the same as the following expression:
s.trim().length() == 0
When multiple strings are specified, the function tests if all of them are blank. This is the same as the following expression:
mergeStrings(strings).trim().length() == 0

Parameters:

s

The string to be tested.
strings
The array of strings to be tested.

When an array element is not a string, it is converted to string using Java java.lang.Object.toString() method. If the element is null, it is considered to be an empty string.