Golang does not exit due to exception

With the popularity of Golang, more and more developers are beginning to use Golang to develop applications. Although Golang has a concise and easy-to-read syntax similar to C language, it is more demanding in exception handling compared to other languages. This article will introduce how to implement exception non-exit method in Golang.

In Golang, if you use the standard panic and recover mechanisms to handle exceptions, the program will exit directly. The following is a simple example:

func test() {
    defer func() {
        if r := recover(); r != nil {
            fmt.Println("Recovered:", r)
        }
    }()
    fmt.Println("Start test")
    panic("Something wrong")
}

func main() {
    test()
    fmt.Println("End main")
}

In the above code, when the test function executes the panic statement, the program will exit directly without outputting "End main". Therefore, we need to find other exception handling methods to prevent the program from exiting when an exception occurs.

A simple way is to use the defer statement and recover function to handle exceptions. We can use the following code block to catch exceptions:

func test() {
    defer func() {
        if r := recover(); r != nil {
            fmt.Println("Recovered:", r)
        }
    }()
    fmt.Println("Start test")
    panic("Something wrong")
}

func main() {
    defer func() {
        if r := recover(); r != nil {
            fmt.Println("Recovered:", r)
        }
    }()
    test()
    fmt.Println("End main")
}

In this case, when the test function executes the panic statement, the recover function will be triggered, and the program will continue to execute instead of exiting. Finally, the main function will output "End main".

Another way to handle exceptions is to use Golang's error handling mechanism. All functions in Golang can return an error object. Therefore, when an exception occurs inside a function, we can directly return the error object instead of using the panic statement to terminate the execution of the program.

The following is an example of using the error handling mechanism to handle exceptions:

func test() error {
    fmt.Println("Start test")
    return errors.New("Something wrong")
}

func main() {
    if err := test(); err != nil {
        fmt.Println(err)
    }
    fmt.Println("End main")
}

In this example, the test function returns an error object created by the New function. In the main function, we determine whether an exception occurs by checking whether the return value of the test function is nil. If an exception occurs, the program outputs an error message and continues execution. Finally, the main function outputs "End main".

In summary, Golang's exception handling can be implemented through the recover function and error handling mechanism. We can choose the appropriate exception handling method based on specific business needs.

The above is the detailed content of Golang does not exit due to exception. For more information, please follow other related articles on the PHP Chinese website!