golang的字符串拼接

package main

import (
    "bytes"
    "fmt"
	"strings"
	"strconv"
)

func main() {
    // 字符串拼接1
    s1 := fmt.Sprintf("%s:%d", "127.0.0.1", 8080)
    fmt.Println(s1)

    // 字符串拼接2
    s2 := strings.Join([]string{"hello", "world"}, "")
    fmt.Println(s2)

    // 字符串拼接3
    s3 := bytes.Buffer{}
    s3.WriteString("hello")
    s3.WriteString("world")
    fmt.Println(s3.String())

    // 字符串拼接4
    s4 := "hello" + "world"
	fmt.Println(s4)

	// 字符串拼接5
	s5 := strings.Builder{}
	s5.WriteString("hello")
	s6 := strconv.Itoa(123)
	s5.WriteString(s6)
	s5.WriteString("world")
	fmt.Println(s5.String())
}