Most interesting/useful Java classes? [closed]

Answer 1

SwingWorker is definitely a great class. It allows you to conveniently create worker threads in your Swing applications. This will return the final result of the processing and can even provide interim results to the EDT based on processing.

Answer 2

• Base of all "Object" for equals() and toString() methods.
• Exception class. You can't do away with it.
• Collections API. Almost everything from Collections API is useful and used in your code.
• System class for System.out.println. But it is almost replaced by logger API.
• ThreadPoolExecutor if your product really uses threads and you really care about them being controlled :).
• JDBC API. Solely based on if we are talking about usage. But even this is going in background due to use of Hibernate (ORM tools)

Tried to list few useful ones, But I think list will really go long.

Answer 3

ThreadLocal is probably near the top of the list. This class is the main way a lot of the magic happens in higher level frameworks, and if used properly, provides an interesting way of sharing references amongst a thread.

The Reflection package is also pretty powerful and a worthwhile tool to use in moderation.

Answer 4

Collections framework, Java Utility package esp. the RegExp parsing classes. Really depends on what you want to do!

Answer 5

java.beans.Expression

Answer 6

For me, lots of classes in java.nio package.