Exception Handling in Example

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Java

Hello.
I need somebody to explain to me in detail how this code handle the exceptions and how we call the exception through a method?

class SubException extends Exception { }
 class SubSubException extends SubException { }

 public class CC { void doStuff() throws SubException { } }

 class CC2 extends CC { void doStuff() throws SubSubException { } }
 class CC3 extends CC { void doStuff() throws Exception { } }

 class CC4 extends CC { void doStuff(int x) throws Exception { } }

 class CC5 extends CC { void doStuff() { } }

and can throw exception to override method ?
Thanks.