Scala入门

一、Scala概述

二、Scala数据类型

三、Scala基本操作

object Second {

  import scala.util.control.Breaks._

  def main(args: Array[String]): Unit = {
    val arr2 = new Array[String](10)-------数组定义（一）
    arr2(0) = "1"
    arr2(1) = "1"
    val arr1 = Array("name", "james", "redwe")-----数组定义（二）
    val it = arr1.iterator
    while (it.hasNext) {
      println(it.next())
    }
    val tp1 = ("rwere", 123, "423", '1', 1, 2, 4)------tuple2可以插入不同类型的数据
    tp1.productIterator.foreach(x => println("value=" + x))
    val tp2 = new Tuple2("ddw", 123)
    println(tp2._1)
    var num = 10----------打印三角形的方法
    for (i <- 1 until num) {
      for (j <- 1 to i) {
        print(" ")
      }
      for (k <- 1 to num - i) {
        if (i == 1 || i == num - 1) print("*")
        else if (k == 1 || k == num - i) print("*")
        else print(" ")
      }
      println()
    }
    for (i <- 1 until num) {
      for (j <- 1 to num - i) {
        if (i == 1 || i == num) print("*")
        else if (j == 1 || j == num - i) print("*")
        else print(" ")
      }
      println()
    }
    for (i <- 1 until num) {
      for (j <- 1 to num - i) {
        print(" ")
      }
      for (k <- 1 to i) {
        if (i == 1 || i == num - 1) print("*")
        else if (k == 1 || k == i) print("*")
        else print(" ")
      }
      println()
    }
    for (i <- 1 until num) {
      for (j <- 1 to i) {
        if (i == 1 || i == num - 1) print("*")
        else if (j == 1 || j == i) print("*")
        else print(" ")
      }
      println()
    }
    val tp = ("ewe", 1, 24, 435, 5435, 66, 22)
    tp.productIterator.foreach(x => println("val=" + x))
    val arr = Array("eww", 124, 3243)
    println(arr(1))
    var a = 10 ------变量定义
    val b = for (i <- 1 to a; if i > 0; if i % 3 == 1; if i % 2 == 0) yield i        -多条件
    println(b(0))
    println(b(1))
    val c = 20  ------------常量定义
    breakable {--------中断的用法
      for (i <- 1 to c by 2)
        if (i % 5 == 0) break
        else print(i)
    }
  }
}