Java Exceptions

Question

Why is it that sometimes in java I have to import the Exception class while other times it don't? Example:
public static int display(int a, int b) throws ArithmeticException, IOException{
throw new ArithmeticException("Cannot divide by zero");
}
here I have to import java.io.IOException but there is not a import for ArithmeticException

Answer 1

`ArithmeticException` is defined in `java.lang` package. `java.lang` is auto imported.

Not only `ArithmeticException` but other classes like `Integer` , `Thread`, `Math` are in `java.lang` package. So every time you need to use these classes you don't need to explicitly use imports.

https://devdocs.io/openjdk~8/java/lang/package-summary

Answer 2

~ swim ~ Thank you for the answer now it makes sense :)

Answer 3

🇮🇳Omkar🕉 Does this have to do with the fact that it's a runtime exception rather that a checked exception?

Answer 4

Thanks 🇮🇳Omkar🕉 and ~ swim ~ I understand why now. I was stuck on this question for quite some time 😅 all the other online sources didn't really explain why.