java answers

This a list of problems in the Java file, in order of importance (the biggest problems are on top):

• It's not really a class, but a collection of utility procedures (see)
• It is doing too many things at the same time: saving, loading, filtering
• There is an obvious code duplication in getContent* methods
• The getContent() will corrupt the content if there are Unicode symbols in the file
• It is mutable, getters and setters should be removed and a constructor introduced
• It doesn't implement any interfaces
• Names like get/set would sound better than get/save
• The class is not thread-safe, despite the promise in the Javadoc
• Exception swallowing is an obvious mistake
• Unicode filtering is done wrong, will break the content instead of filtering it
• Variable names are very short and non-informative
• String concatenation is very ineffective in terms of performance
• It's better to use Files.readAllBytes() instead of manual reading/writing
• while ((data = i.read()) > 0) is a bad style, should be while (true)
• Input and output streams are not buffered
• One-byte reading is ineffective, we should read to the memory buffer
• Both streams are not closed after use
• All non-modifiable variables should be final
• i += 1 is not the best method of variable increment, should be ++i
• file is not prepended with this.

If you miss the first three problems, we won't work with you.