When is "throws Exception" thrown?
When is "throws Exception" thrown?
Ask by Revati S Misra
Updated 29 Jul 2023
The
throwskeyword in Java is used to declare that a method can throw an exception. This means that the method does not handle the exception itself, but instead passes it on to the caller of the method. The caller of the method is then responsible for handling the exception or propagating it further.The
throwskeyword is used in the method signature, after the method name and parameter list. Thethrowskeyword is followed by a comma-separated list of the exceptions that the method can throw.For example, the following method declaration declares that the method can throw a
IOExceptionexception:If the
readFile()method encounters anIOExceptionwhile reading the file, it will throw the exception. The caller of thereadFile()method will then need to handle the exception or propagate it further.The
throwskeyword is not required for unchecked exceptions. Unchecked exceptions are not checked at compile time, so the compiler does not require the method to handle or specify them. However, it is still good practice to use thethrowskeyword for unchecked exceptions, as it makes the code more readable and maintainable.Here are some examples of when the
throwskeyword might be used:FileNotFoundExceptionexception if the file does not exist.IOExceptionexception if the connection is lost.ParseExceptionexception if the string is not well-formed.