| Exception handling can be viewed as a nonlocal control structure. |
| When a method throws an exception, its caller must determine whether it can catch the exception. |
| If the calling method can catch the exception, it takes over and execution continues in the caller. |
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| Java exceptions are class objects subclassed from java.lang.Throwable. Because exceptions are class objects, they can contain both data and methods. In fact, the base class Throwable implements a method that returns a String describing the error that caused the exception. This is useful for debugging and if we want to give users a meaningful error message. |