Exceptions
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- Exceptions are a mechanism to detect and handle errors without writing special code to test return values.
- Error handling code for common errors can be handled in a single place.
Structure
- A try clause has to have either a catch clause or a finally clause or both.
- catch must follow try.
- finally must follow the last catch clause.
Exception Hierarchy
- All exception classes are subtypes of java.lang.Exception.
- RunTimeException is a subtype of Exception which represents unchecked exceptions. All unchecked exception will inherit from this class.
- Classes which derive from java.lang.Error indicate serious problems that an application should not try to catch. e.g OutOfMemory error.
- Both Error and Exception classes are derived from the java.lang.Throwable class.