Golang 标准库详解与在线编译平台：高效掌握核心技术 + 项目实战案例分享

package main

import "fmt"

func main() {
    x := 
    y := 3.14
    s := "Hello, Go!"
    fmt.Printf("x的值是：%v，类型是：%T\n", x, x)
    fmt.Printf("y的值是：%v，类型是：%T\n", y, y)
    fmt.Printf("s的值是：%v，类型是：%T\n", s, s)
}

package main

import (
    "fmt"
    "strings"
)

func main() {
    s := []string{"Hello", "World", "Go"}
    result := strings.Join(s, " ")
    fmt.Println(result) // 输出：Hello World Go
}

package main

import (
    "fmt"
    "sync"
)

func main() {
    var wg sync.WaitGroup
    counter := 

    for i := ; i < ; i++ {
        wg.Add()
        go func() {
            defer wg.Done()
            counter++
        }()
    }

    wg.Wait()
    fmt.Println("最终计数:", counter) // 输出：最终计数: 5
}

package main

import (
    "fmt"
    "net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, World!")
}

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

package main

import (
    "fmt"
    "net/http"
)

func helloHandler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, World!")
}

func main() {
    // 静态文件服务
    fs := http.FileServer(http.Dir("./static"))
    http.Handle("/", fs)

    // 动态路由
    http.HandleFunc("/hello", helloHandler)

    http.ListenAndServe(":8080", nil)
}