[英]How can I initialize object array in kotlin
我像这样制作了 object class 数组:
private val stockList= MutableList(50){Stock()}
库存 class 有一些变量,如name
、 number
、 price
等。那么如何初始化这个 object class 列表?
stoke *item = new stoke[numb];
for (int a = 0; a < numb; a++) {
char* tmp = new char[100];
int price = 0, number = 0;
cout << a + 1 << ". name price number (using spacebar)";
cin >> tmp >> price >> number;
item[a].setproduct(tmp, price, number);
}
当我使用c++时,我通过这种方式(consol)获得了class成员vlaue。
val editTitle = dialogView.findViewById(R.id.editTitle) as EditText
val editNumber = dialogView.findViewById(R.id.editnumber) as EditText
val editBuy = dialogView.findViewById(R.id.editbuy) as EditText
val editSell = dialogView.findViewById(R.id.editsell) as EditText
以下是现货 class
class stock{
var name:String?=null
var buyprice:Int=0
var sellprice:Int=0
var important:Boolean = false
var number:Int = 0}
我应该制作 class 构造函数吗?
当我使用布局小部件editText
获取这些值时,如何将这些值放入stocklist
?
不太确定你的问题是什么,我不知道 Android。但这里有一个构建对象列表的示例,从 STDIN 读取值:
data class Stock(
var name: String? = null,
var price: Int = 0,
var important: Boolean = false,
var number: Int = 0
)
fun main() {
print("How many items? ")
val itemCount = readLine()!!.toInt()
val items: List<Stock> = (1..itemCount).map {
print("$it. name price number (using spacebar): ")
val (inputName, inputPrice, inputNumber) = readLine()!!.split(' ')
Stock(
name = inputName,
price = inputPrice.toInt(),
number = inputNumber.toInt(),
)
}
println(items)
}
示例 session:
How many items? 3
1. name price number (using spacebar): a 1 2
2. name price number (using spacebar): b 3 4
3. name price number (using spacebar): c 5 6
[Stock(name=a, price=1, important=false, number=2), Stock(name=b, price=3, important=false, number=4), Stock(name=c, price=5, important=false, number=6)]
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