切片越界
func main() { // 捕捉异样 defer func() { if err := recover(); err != nil { fmt.Println(err) } }() //panic 1.切片越界,上面的会panic! arr := make([]int, 2) arr[2] = 5 fmt.Println(arr)}运行后果
runtime error: index out of range [2] with length 2反复敞开chan
func main() { //2.反复敞开 chan c := make(chan int) close(c) close(c)}运行后果
panic: close of closed channel曾经敞开的chan持续发送
func main() { //3.曾经敞开的chan 持续发送数据 d := make(chan int) close(d) d <- 1}运行后果
panic: send on closed channel空指针的状况,定义的指针变量没有初始化,就间接应用
func main() { //4.空指针的状况,定义的指针变量没有初始化,就间接应用 var p *people fmt.Println(p.printName)}type people struct { Name string Age int}func (p people) printName() { fmt.Println(p.Name)}运行后果
panic: runtime error: invalid memory address or nil pointer dereference[signal 0xc0000005 code=0x0 addr=0x0 pc=0x12cb491]定义的map没有初始化就间接应用
func main(){//5. map 没有初始化间接应用 var m map[int]string m[0] = "111"}运行后果
panic: assignment to entry in nil map常见的谬误然而不是panic的状况
数组越界 在程序运行就爆红了
多个groutine 读写 map
func main() { //多个groutine 读写 map, 产生 fatal error: concurrent map writes， 而不是 panic m := make(map[int]string) go func() { m[1] = "111" }() go func() { m[1] = "111" }() fmt.Println(m)运行后果
fatal error: concurrent map writes