Does the original exception disappear due to the exception generated in the catch block?
When wrapping an exception with another exception, do you include the original exception?
ʻE.printStacktrace` is missing (except when permitted by coding standards, etc.)
Be able to track the information of the exception that occurred, such as e.addSuppressed, which is output to the log.
In the comments, specify the reason why you can squeeze it if you can squeeze it.
Are variables overwritten (except in certain circumstances)?
The only variables that need to be overwritten are usually counters.
Are you nesting blocks where early returns are applicable?
If you are processing with an if block such as if (isXXX) {}, consider whether if (! IsXXX) {return;} can be applied.
Are there any omissions in closing resources?
Closeable / AutoCloseable such as InputStream / OutputStream actively uses try-with-resources
If you do not explicitly close, specify in the comment when to close and why not close
Is there any excessive checking process?
Specify in Javadoc whether to allow nulls in public methods or not.
return null; Code returns a constant that represents Empty as much as possible (such as Optional # empty () and Collections # emptyList ()).
If return null is in an abnormal state, throw an exception, or use the class that represents the status as the return value.
Are you using the constants defined in the library etc.
HTTP status code etc.
Is IN / OUT processing buffered?
Use BufferedInputStream instead of raw InputStream, etc.
Is the specific code that appears frequently properly classified and made into a utility?
In principle, delegation is based on delegation rather than inheritance.
is --Are there any inheritance that does not become a?
If there are many processes that branch depending on the instance such as * instance of, there is a high possibility that an appropriate inheritance relationship is not maintained.
Is the resource open in the constructor?
If you want to open the resource in the constructor, consider static factory method.