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There is a newer version: 8.9.0.37768

An indexOf or lastIndexOf call with a single letter String can be made more performant by switching to a call with a char argument.

Noncompliant Code Example
String myStr = "Hello World";
// ...
int pos = myStr.indexOf("W");  // Noncompliant
// ...
int otherPos = myStr.lastIndexOf("r"); // Noncompliant
// ...


Compliant Solution
String myStr = "Hello World";
// ...
int pos = myStr.indexOf('W'); 
// ...
int otherPos = myStr.lastIndexOf('r');
// ...