Strings and Boxed types should be compared using "equals()"

There are a number of Sonarqube violations relating to comparisons of Boxed types and Strings using the "==" operator rather than ".equals()".

Sonarcloud analysis: https://sonarcloud.io/organizations/apache/issues?resolved=false&rules=squid%3AS4973

Violated rule: https://rules.sonarsource.com/java/RSPEC-4973

Are pull requests for fixing these welcome?