rspec/rules/S3033/java/rule.adoc

== Why is this an issue?

Assembling a ``++StringBuilder++`` or ``++StringBuffer++`` into a ``++String++`` merely to see if it's empty is a waste of cycles. Instead, jump right to the heart of the matter and get its ``++.length()++`` instead.


=== Noncompliant code example

[source,java]
----
StringBuilder sb = new StringBuilder();
// ...
if ("".equals(sb.toString()) { // Noncompliant
  // ...
}
----


=== Compliant solution

[source,java]
----
StringBuilder sb = new StringBuilder();
// ...
if (sb.length() == 0) {
  // ...
}
----


ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

=== Message

Test "xxx.length()" against 0 to see if "xxx" is empty.


endif::env-github,rspecator-view[]