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This article mainly introduces "what is the Java exception mechanism". In the daily operation, I believe many people have doubts about what the Java exception mechanism is. The editor consulted all kinds of data and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "what is the Java exception mechanism?" Next, please follow the editor to study!

The following is the organizational structure of the Java exception class, the red area of the exception class indicates that the program needs to display to catch or throw.

Throwable

Throwable is the top class for Java exceptions, and all exceptions inherit from this class.

Error,Exception are two major categories of exception classes.

Error

Error is a non-program exception, that is, an exception that a program cannot catch, which is usually a compilation or systematic error, such as an OutOfMemorry memory overflow exception.

Exception

Exception is a program exception class that is generated within the program. Exception is divided into run-time exception and non-run-time exception.

Runtime exception

The characteristic of the runtime exception is that the Java compiler will not check it, that is, when such an exception may occur in the program, it will be compiled and passed even if it is not caught with the try-catch statement or thrown with the throws clause, and the runtime exception can be handled or not handled. Runtime exceptions often come out to define custom exceptions of the system, and the business handles them differently according to the custom exceptions.

Common runtime exceptions such as NullPointException, ArrayIndexOutOfBoundsException, and so on.

Non-runtime exception

A non-runtime exception is an exception that a program must handle, catch or throw, and cannot be compiled without handling it. Such as common IOException, ClassNotFoundException and so on.

At this point, the study of "what is the exception mechanism of Java" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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