RFR: JDK-8304945: StringBuilder and StringBuffer should implement Appendable explicitly

[Joe Darcy]

On Sun, 2 Apr 2023 07:45:23 GMT, Sergey Tsypanov <stsypanov at openjdk.org> wrote:

>> The StringBuilder and StringBuffer classes are Appendable by virtue of from subclasses their non-public superclass AbstractStringBuilder.
>> 
>> It is slightly clearer to declare StringBuilder and StringBuffer to directly implement Appendable, as they already directly implement the CharSequence interface also implemented by their superclass.
>> 
>> There are no other interfaces implemented by AbstractStringBuilder other than Appendable and CharSequence.
>> 
>> Please also review the CSR https://bugs.openjdk.org/browse/JDK-8305408
>
> src/java.base/share/classes/java/lang/StringBuilder.java line 93:
> 
>> 91: public final class StringBuilder
>> 92:     extends AbstractStringBuilder
>> 93:     implements Appendable, java.io.Serializable, Comparable<StringBuilder>, CharSequence
> 
> Not an issue here, just wondering why do we have lots of places where we use `java.io.Serializable` instead of import statement?

The JDK codebase historically has not used tooling to enforce a uniform style on such matters.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/13278#discussion_r1156240099