java - When should Throwable be used instead of new Exception? -

Given: Throwable exception is a superclass.

When I read a book on my 'exception', see examples of blocks and other texts used in the throwable hold Code> new exception () is being used in the cache block I have not yet received an explanation when each should use.

My question is, when should throws be used and when new exception (<) can be used?

Edit: By using either hold or else :

  is worth throwing;  

or

  throw a new exception (); (From comments) raised this issue that I need it  

/ P>

In that case, you want to throw an check exception . You can create a custom subclass of it (except for and its subclasses which are unchecked ), or exception (such as " CollectionBuildException "). To get the speed with Java exceptions, see.