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()
  }

}