feat(Go-StudyExample): 新增 网络及端口测试、传值和传址的比较、切片测试、Map测试、通道测试、测试init调用、测试error、defer关键字、recover测试、测试携程的异常捕获、矩阵旋转

example/originGoLanguage/DeferTest.go

@@ -0,0 +1,133 @@
+/*
+ *  @Author : huangzj
+ *  @Time : 2020/7/13 14:37
+ *  @Description：测试defer关键字、recover
+ */
+
+package originGoLanguage
+
+import (
+	"fmt"
+	"time"
+)
+
+func TestDefer() {
+	//defer会在所有函数执行完成之后才进行执行
+	testDeferExe()
+	//defer产生的值是在对应位置的值，后面的变化不会产生影响
+	fmt.Println(testDeferValue())
+	//defer的执行是先进后出
+	testDeferExeOrder()
+	testDeferRecover()    //defer对异常的捕获
+	testDeferRecoverOut() //外层异常捕获
+}
+
+func TestCtripException() {
+	fmt.Println("测试不进行捕获的情况")
+	testNotDefer()
+
+	fmt.Println("测试进行捕获的情况")
+	testDefer1()
+}
+
+func testNotDefer() {
+	go sayHello()
+
+	for i := 0; i < 10; i++ {
+		time.Sleep(5000)
+		fmt.Println(i)
+	}
+}
+
+func testDefer1() {
+	go sayHello1()
+
+	for i := 0; i < 10; i++ {
+		time.Sleep(5000)
+		fmt.Println(i)
+	}
+}
+
+func sayHello1() {
+	defer func() {
+		if err := recover(); err != nil {
+			fmt.Println("错误信息", err)
+		}
+	}()
+}
+
+func sayHello() {
+	var map1 map[string]int
+	//这里会发生异常
+	fmt.Println(map1["say"])
+}
+
+func testDeferRecover() {
+	//多个panic只会捕获最后一个
+	defer func() {
+		if err := recover(); err != nil {
+			fmt.Println("错误信息是：", err)
+		}
+	}()
+
+	panic1()
+	panic2()
+	panic3()
+
+	//一旦错误被捕获就不会继续运行
+	fmt.Println("我会继续运行")
+
+}
+
+func panic3() {
+	panic("panic3")
+}
+
+func panic2() {
+	panic("panic2")
+}
+
+func panic1() {
+	panic("panic1")
+}
+
+func testDeferRecoverOut() {
+	testDeferRecover()
+
+	fmt.Println("外层继续执行")
+}
+
+func testDeferExe() {
+	i := 0
+	defer func() {
+		fmt.Println(i)
+	}()
+	fmt.Println("i am after")
+}
+
+func testDeferValue() int {
+	i := 0
+	defer func() {
+		fmt.Println("first: ", i)
+	}()
+
+	i++
+	defer func() {
+		fmt.Println("second: ", i)
+	}()
+
+	i++
+	return i
+}
+
+func testDeferExeOrder() {
+	defer func() {
+		fmt.Println("first")
+	}()
+
+	defer func() {
+		fmt.Println("second")
+	}()
+
+	defer fmt.Println("third")
+}