- Exceptions are the objects representing the logical errors that occur at run time and makes JVM enters into the state of "ambiguity".
- The objects which are automatically created by the JVM for representing these run time errors are known as Exceptions.
- An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch. Most such errors are abnormal conditions.
- few of the subclasses of
Error.
AnnotationFormatError
- Thrown when the annotation parser attempts to read an annotation from a class file and determines that the annotation is malformed.AssertionError
- Thrown to indicate that an assertion has failed.LinkageError
- Subclasses of LinkageError indicate that a class has some dependency on another class; however, the latter class has incompatibly changed after the compilation of the former class.VirtualMachineError
- Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.- There are really three important subcategories of
Throwable
: Error
- Something severe enough has gone wrong the most applications should crash rather than try to handle the problem,- Unchecked Exception (aka
RuntimeException
) - Very often a programming error such as aNullPointerException
or an illegal argument. Applications can sometimes handle or recover from thisThrowable
category -- or at least catch it at the Thread'srun()
method, log the complaint, and continue running. - Checked Exception (aka Everything else) - Applications are expected
to be able to catch and meaningfully do something with the rest, such as
FileNotFoundException
andTimeoutException
.
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