Scala笔记——字符串

object test_string {
  def main(args: Array[String]): Unit = {
    //  字符串通过+号连接
    val name: String = "fyl"
    val age: Int = 23
    println(age + "岁的" + name) //23岁的fyl
    // *号用于将一个字符串复制多次并连接
    println(name * 3) //fylfylfyl
    //  printf通过%传值
    printf("%d岁的%s", age, name) //23岁的fyl
    println()
    //  字符串模板(插值字符串)：通过$获取变量值
    println(s"${age}岁的${name}") //23岁的fyl
    //  格式化字符串模板
    val num: Double = 1.2345
    println(f"The num is ${num}%.2f") //The num is 1.23
    //原始化输出
    println(raw"The num is ${num}%.2f") //The num is 1.2345%.2f
    //"""三引号表示字符串，保持多行字符串的原格式输出
    val sql =
      s"""
         |select *
         |from
         |  Student
         |where
         |  name = ${name}
         |and
         |  age > ${age}
      """.stripMargin
    println(sql)
    /*
          select *
      from
        Student
      where
        name = fyl
      and
        age > 23
     */
  }
}