What is the checked and unchecked exception?

What is the checked and unchecked exception?

What is the checked and unchecked exception?

• The exceptions which are checked by the compiler for smooth execution of the program are called checked exceptions.
• In our program, if there is a chance of raising checked exception then compulsory we should handle that checked exception either by try-catch or by throws keyword otherwise we will get compile time error.
• Unchecked exceptions are generated because of a programming error. They are not always caught by the program because they generally require a change by the programmer to be fixed.
• Checked Exceptions are not the result of a programming mistake. Instead, they occur in the normal operation of a program. An example would be an IOException that is thrown when a file cannot be opened. Because these exceptions occur even if there is nothing wrong with the program, it is necessary to tell the program how to handle the exception.
• Checked Exception is required to be handled by compile time while Unchecked Exception doesn’t.
• Checked Exception is direct sub-Class of Exception while Unchecked Exception is of RuntimeException.
• CheckedException represents scenario with higher failure rate while Unchecked exceptions mostly programming mistakes.
• The exceptions which are not checked by compiler whether programmer handling or not. Such type of exceptions is called unchecked exceptions.
  • Example:- ArithmeticException, etc..
• Note 1:- whether it is checked or unchecked every exception occurs at runtime only there is no chance of occurring any exception at compile time.
• Note 2:- RuntimeException and its child classes, Error, and its child classes are unchecked Exceptions. Except these remaining are checked.