Checking for string contents? string Length Vs Empty String

Question

Which is more efficient for the compiler and the best practice for checking whether a string is blank?

1. Checking whether the length of the string == 0

Answer 1

In Java 1.6, the String class has a new method [isEmpty] 1

There is also the Jakarta commons library, which has the [isBlank] 2 method. Blank is defined as a string that contains only whitespace.