huangzj
134 lines
1.9 KiB
Go
134 lines
1.9 KiB
Go
/*
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* @Author : huangzj
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* @Time : 2020/7/13 14:37
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* @Description：测试defer关键字、recover
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*/
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package originGoLanguage
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import (
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"fmt"
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"time"
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)
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func TestDefer() {
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//defer会在所有函数执行完成之后才进行执行
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testDeferExe()
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//defer产生的值是在对应位置的值，后面的变化不会产生影响
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fmt.Println(testDeferValue())
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//defer的执行是先进后出
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testDeferExeOrder()
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testDeferRecover() //defer对异常的捕获
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testDeferRecoverOut() //外层异常捕获
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}
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func TestCtripException() {
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fmt.Println("测试不进行捕获的情况")
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testNotDefer()
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fmt.Println("测试进行捕获的情况")
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testDefer1()
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}
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func testNotDefer() {
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go sayHello()
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for i := 0; i < 10; i++ {
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time.Sleep(5000)
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fmt.Println(i)
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}
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}
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func testDefer1() {
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go sayHello1()
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for i := 0; i < 10; i++ {
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time.Sleep(5000)
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fmt.Println(i)
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}
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}
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func sayHello1() {
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defer func() {
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if err := recover(); err != nil {
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fmt.Println("错误信息", err)
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}
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}()
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}
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func sayHello() {
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var map1 map[string]int
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//这里会发生异常
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fmt.Println(map1["say"])
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}
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func testDeferRecover() {
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//多个panic只会捕获最后一个
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defer func() {
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if err := recover(); err != nil {
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fmt.Println("错误信息是：", err)
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}
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}()
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panic1()
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panic2()
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panic3()
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//一旦错误被捕获就不会继续运行
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fmt.Println("我会继续运行")
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}
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func panic3() {
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panic("panic3")
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}
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func panic2() {
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panic("panic2")
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}
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func panic1() {
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panic("panic1")
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}
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func testDeferRecoverOut() {
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testDeferRecover()
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fmt.Println("外层继续执行")
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}
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func testDeferExe() {
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i := 0
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defer func() {
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fmt.Println(i)
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}()
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fmt.Println("i am after")
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}
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func testDeferValue() int {
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i := 0
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defer func() {
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fmt.Println("first: ", i)
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}()
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i++
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defer func() {
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fmt.Println("second: ", i)
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}()
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i++
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return i
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}
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func testDeferExeOrder() {
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defer func() {
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fmt.Println("first")
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}()
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defer func() {
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fmt.Println("second")
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}()
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defer fmt.Println("third")
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}
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