scala容器使用

花了两个小时左右，学习了一下scala语言， 由于scala运行在jvm之上， 可以使用java容器也可以使用scala自带的容器.

import java.util

import java.util.{HashMap => JavaHashMap}

import scala.collection.mutable.HashMap

import java.util.{ArrayList => JavaList} // rename





object tewst {



   def testarry(): Unit = {

     print("scala array")

     val buf = new scala.collection.mutable.ArrayBuffer[Int]



     for (i <- 0 to 10) {

       buf += i

     }

     buf += 11



     buf.foreach(u =>print(u + "\t"))



     // 数组

     print("\n java array \n")

     var arry = new Array[String](3);

     arry(0) = "javaarray0";

     arry(1) = "javaarray1";

     arry(2) = "javaarray2";

     for(i <- 0 to 2){

       print(arry(i) + "\t");

     }

   }



   def testlist(): Unit ={

     print("\n scala list \n")

     // 效果一样

     // var buf = new scala.collection.mutable.ListBuffer[Int]

     var buf = scala.collection.mutable.ListBuffer.empty[Int]

     for(i <- 0 to 10)

       buf += i

     buf.foreach(B=>print(B + "\t"))



     print("\n java list \n")

     var javalist = new JavaList[Int]()

     for(i <- 0 to 10){

       javalist.add(i)

     }



     for(i <- 0 to javalist.size() - 1)

       print(javalist.get(i) + "\t")

   }



  def testlistcombine(): Unit ={

    var list1 = List("list1", "list2", "list3");

    list1.foreach(list=>print("合并前: " +  list + "\n"))

    var list2 = List("list11", "list12", "list13");

    list2.foreach(list=>print("合并前: " + list + "\n"))

    var list3 = list1 :::list2

    list3.foreach(list=>print("合并后: " + list + "\n"))

  }





  def testset(): Unit ={

    print("\n scala set \n")

    var set =  scala.collection.mutable.HashSet("set1", "set2")

    set += "set3"

    set.foreach(value=>print(value + "\t"))



    print("\n java set \n")

    var javaset = new util.HashSet[String]()

    for(i <- 0 to 3){

      javaset.add("set" + i.toString())

    }



    var itor = javaset.iterator()

    while(itor.hasNext){

      print(itor.next()  +  " \t")

    }

  }





   def testhashmap(): Unit ={

     print("\n scala hashmap \n")

     var buf = new scala.collection.mutable.HashMap[Int, Int]()

     for (i <- 0 to 10){

       buf += (i -> i)

     }

     buf += (11 -> 11)

     buf.foreach(f=>print("key: " + f._1 + "value :" + f._2 + "\t"))



     print("\n java hashmap \n")

     var javamap  = new JavaHashMap[String, String]()

     for(i <- 0 to 10){

       javamap.put(i.toString, i.toString)

     }

     for(i <- javamap.keySet().toArray()){

       print("key:= " + i  + " value " + javamap.get(i) + "\t")

     }

   }





   def main(args: Array[String]) {

     testarry()

     testlist()

     testset()

     testhashmap()

  }



}