1.Checked Exceptions
Environmental error that cannot necessarily be detected by testing; e.g. disk full, broken socket, database unavailable, etc.
2.Errors
Virtual machine error: class not found, out of memory, no such method, illegal access to private field, etc.
3.Runtime Exceptions
Programming errors that should be detected in testing: index out of bounds, null pointer, illegal argument, etc.
Checked exceptions must be handled at compile time. Runtime exceptions do not need to be. Errors often cannot be
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