Go error handling

Time:2021-12-4

Go error handling

  • Error type is an interface type. This is its definition:
    type error interface {
      Error() string
    }

Go catch exception

Traditional methods of catching exceptions

try 
catch
finally

Go language

Defer, panic and recover are introduced
1. Go program throws a panic exception, catches the exception through recover in defer, and then handles it

case

package main
import "fmt"
func test() {
    //Execute defer before the function exits
    //After catching an exception, the program will not exit abnormally
    defer func() {
        Err: = recover() // built in function, which can catch function exceptions
        if err != nil {
            //This is a printing error, and you can also alarm, such as wechat and email notification
            FMT. Println ("err error message:", ERR)
        }
    }()
    //If there is no exception capture, the error panic will be reported directly, and an error will occur at runtime
    num1 := 10
    num2 := 0
    res := num1 / num2
    FMT. Println ("res result:", RES)
}
func main() {
    test()
    FMT. Println ("if the program doesn't quit, go to me")
}

Print results

Err error message: runtime error: integer divide by zero
If the program doesn't quit, go to me
Exiting.

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