Java checked and unchecked exceptions

Question

1. If I create an exception class that extends Exception , will my class be checked or unchecked? I note that the subclass of Exception called RuntimeException is an unchecked exception whereas all other subclasses of 'Exception' are checked exceptions.

2. If I create an exception class that extends RuntimeException , can I specify that this class is checked?

Answer 1

1) Checked

2) No

If you extend Exception -> checked

If you extend RuntimeException -> unchecked

From documentation:

The class {@code Exception} and any subclasses that are not also * subclasses of {@link RuntimeException} are checked * exceptions

Answer 2

除非从RuntimeException或Error继承，否则将检查异常

Answer 3

If you create class that extends Exception it would be checked. You can't specify RuntimeException as checked since it is unchecked exception

Answer 4

If your class extends Exception it can throw checked exceptions.

If your class extends Error or RuntimeException it can throw unchecked exceptions.