Error is the real something happen from exception. Exception is the way to catch the error. For example when you get the variable let say String str, we got Null ...

Some exceptions in Java must be handled in the developer's code. Other exceptions can occur without any exception handling semantics at all. When an exception must be handled with try-and-catch ...

Answer: Checked exceptions are exceptions that are checked at compile-time, and the programmer is required to handle or declare them using try-catch blocks or specifying them in the method signature ...