Scala函数

def 函数名(参数名:参数类型) :返回值类型 = {
  
}

package com.bx.helloworld

object HelloWorld {
  def main(args: Array[String]): Unit = {
    println(add(1, 2))
  }

  def add(x: Int, y: Int): Int = {
    x + y
  }
}

object HelloWorld {
  def main(args: Array[String]): Unit = {
    print(isTest)
  }

  def isTest() = true
}

object HelloWorld {
  def main(args: Array[String]): Unit = {
    setAge()
  }

  def setAge(age:Int = 18):Unit={
     print(age)
  }
}

object HelloWorld {
  def main(args: Array[String]): Unit = {
    print(sum(1,2,3,4,5))
  }

  def sum(numbers: Int*) = {
    var result = 0
    for (number <- numbers) {
      result += number
    }
    result
  }
}

if(布尔表达式)
{
   // 如果布尔表达式为 true 则执行该语句块
}