Check whether a string is not null and not empty

Question

How can I check whether a string is not null and not empty?

public void doStuff(String str)
{
    if (str != null && str != \"**here I want to check          


        

Answer 1

There is a new method in java-11: String#isBlank

Returns true if the string is empty or contains only white space codepoints, otherwise false.

jshell> "".isBlank()
$7 ==> true

jshell> " ".isBlank()
$8 ==> true

jshell> " ! ".isBlank()
$9 ==> false

This could be combined with Optional to check if string is null or empty

boolean isNullOrEmpty = Optional.ofNullable(str).map(String::isBlank).orElse(true);

String#isBlank