What is a checked exception what is an unchecked exception, Basic Computer Science

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What is a checked exception what is an unchecked exception

1. What is the difference between throwing an exception and catching an exception?

2. What is a checked exception? What is an unchecked exception? Is a NullPointerException checked or unchecked? Which exceptions do you need to declare with the throws reserved word?

3. Why don't you need to declare that your method might throw a NullPointerException?

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Basic Computer Science: What is a checked exception what is an unchecked exception

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