If you are writing a custom exception class, how can you make sure it is checked? How can you make sure it is unchecked?

In Java, the main difference between creating a custom checked exception class and a custom unchecked exception class is the inheritance hierarchy. To create a custom checked exception, you extend the `java.lang.Exception` class which will be checked at compile-time. To create a custom unchecked exception, you extend the `java.lang.RuntimeException` class which will be checked at runtime. Example usage of a custom checked exception: ```java public class CustomCheckedException extends Exception { public CustomCheckedException(String message) { super(message); } } public void exampleMethod() throws CustomCheckedException { if (someCondition) { throw new CustomCheckedException("This is a custom checked exception"); } } ``` Example usage of a custom unchecked exception: ```java public class CustomUncheckedException extends RuntimeException { public CustomUncheckedException(String message) { super(message); } } public void exampleMethod() { if (someCondition) { throw new CustomUncheckedException("This is a custom unchecked exception"); } } ``` Checked exceptions require handling (via try-catch block) or declaration (via throws clause), while unchecked exceptions do not have this requirement.