Scala:打印类变量/属性的类对象列表
我试图打印存储在列表中的类实例的变量。应该自动生成一个getter方法供我使用,但我不能使用它Scala:打印类变量/属性的类对象列表,scala,list,class,oop,instance,Scala,List,Class,Oop,Instance,我试图打印存储在列表中的类实例的变量。应该自动生成一个getter方法供我使用,但我不能使用它 case class InventoryItem(var inventory_item_name: String, var number_of_available_items: Int) class InventoryManagement() { private var inventory_storage = new ListBuffer[InventoryItem]()
case class InventoryItem(var inventory_item_name: String, var
number_of_available_items: Int)
class InventoryManagement() {
private var inventory_storage = new ListBuffer[InventoryItem]()
//New function that connects list to the front.
def attachToList(): Unit = {}
//////////////////////////////
//ADDING AN ITEM TO THE LIST//
//////////////////////////////
def addItems(): Unit = {
var inventory_item_name_input = "0"
var number_of_available_items_input = "0"
inventory_item_name_input = scala.io.StdIn.readLine("What is the name of the item you want to add?")
number_of_available_items_input = scala.io.StdIn.readLine("How many are there?")
inventory_storage += new InventoryItem(inventory_item_name_input,number_of_available_items_input.toInt)
}
///////////////////
//PRINT THE LIST //
///////////////////
def listItems(): Unit = {
println(); println();
println(inventory_storage)
println(inventory_storage.InventoryItem.inventory_item_name) // Failure
println(inventory_storage.inventory_item_name) // Failure
inventory_storage.foreach(println(inventory_item_name)) // More Failure
}
}
假设您的代码如下所示,以向ListBuffer添加元素
case class InventoryItem(var inventory_item_name: String, var number_of_available_items: Int)
var inventory_storage = new ListBuffer[InventoryItem]()
inventory_storage += InventoryItem("a1",1)
inventory_storage += InventoryItem("a2",2)
inventory_storage += InventoryItem("a3",3)
inventory_storage += InventoryItem("a4",4)
现在,要访问listBuffer中case类的变量,可以将write-your-foreach声明为
inventory_storage.foreach{
x => println(x.inventory_item_name)
}
请注意,如果OP没有对您的答案发表评论,
@
对未参与对话的用户无效。@Chaitanya Waikar感谢您的帮助。“=>”函数箭头的使用量超出了我的预期。