Scala练习代码合集

1.

• 作业

object title1 {
  def main(args: Array[String]): Unit = {
    isPalindrom("dad")
    isPalindrom("henry")
  }
  def isPalindrom(word:String): Unit ={
    if(word.equals(word.reverse)) {
      println(word+"是回文单词")
    } else{
      println(word+"不是回文单词")
    }
  }

}

 

object title2 {
  def main(args: Array[String]): Unit = {
          narcissus()
  }

  def narcissus(): Unit = {
    for (number <- 100 to 999) {
      val a = number / 100
      val b = number % 100 / 10
      val c = number % 100 % 10
      if (a * a * a + b * b * b + c * c * c == number) {
        print(number + ",")
      }
    }
  }

 

 

 

 

 

object title3 {
  def main(args: Array[String]): Unit = {
    println("x < 0,y的值为：\n" + func(-1))
    println("x == 0,y的值为：\n"+ func(0))
    println("x > 0,y的值为：\n"+ func(2))
  }

  def func(x: Int): Int = {
    var y = 0
    if (x < 0) y = x * x + 1
    if (x == 0) y = 2
    if (x > 0) y = 6 * x + 3
    return y
  }

}

 

 

 

 

 

object test1 {
  def main(args: Array[String]): Unit = {
    val numList = List(8,0,0,1,3,1,0)
    matchTest(numList)
  }
  def matchTest(x:List[Int]):Unit = x match {
    case List(0,_*)=>println("头部为0的列表")
    case x if x.last == 0=>println("尾部为0的列表")
    case List(_,0,_*)=>println("第二个元素为0的列表")
    case _=>println("其他情况")
  }

}

 

 

object test2 {
  def main(args: Array[String]): Unit = {
    val sentence = "Get Spark from the downloads page of the project website. This documentation is for Spark version 2.4.5. Spark uses Hadoop’s client libraries for HDFS and YARN. Downloads are pre-packaged for a handful of popular Hadoop versions. Users can also download a “Hadoop free” binary and run Spark with any Hadoop version by augmenting Spark’s classpath. Scala and Java users can include Spark in their projects using its Maven coordinates and in the future Python users can also install Spark from PyPI."
    val new_sentence = sentence.split(" ")  // 以空格为分割
    var count = 0 //初始化计数器为0
    for(x<-new_sentence){  //遍历分割后的数据
      if(x.contains("Spark"))
        count +=1  // 若包含Spark，则计数器+1
    }
    println("这段话中出现\"Spark\"单词的次数为：\n" + count)
  }

}

 

 

 

 

object test3 {
  def main(args: Array[String]): Unit = {
    val myList = List(135, 120, 520)
    matchTest(myList)
  }

  def matchTest(x: List[Int]): Unit = x match {
    case x if x.head % 2 == 0 => println("头部为偶数的列表")
    case x if x.head == x.last && x.length >= 2 => println("头部相等的列表")
    case List(_, _, _) if x(0) > 99 && x(1) > 99 && x(2) > 99 => println("3位数俱乐部")
    case _ => println("一般列表")
  }
}