我的程序是一个项目清单。每个项目由用户输入,直至达到10,然后每个项目的总成本(成本*数量)显示在最后。更新ArrayList中的值
但我需要能够更新特定项目的数量。所以我想以某种方式询问用户“你想更新哪个项目?”和“你想要减去多少”,但我不知道如何将项目与其具体数量联系起来。之后,我想再次显示更新的项目列表和更新的总成本。
是否可以做为ArrayList
?或者我应该使用不同的结构?
所以这里的类:
public class StockItem {
String stockItemID;
String stockItemDescription;
double stockItemCostPrice;
double stockItemSellingPrice;
int stockItemQuantityAvailable;
String toString;
int updateItemQuantityAvailable;
StockItem(String stockItemID, String stockItemDescription, double stockItemCostPrice,
double stockItemSellingPrice, int stockItemQuantityAvailable, int
updateItemQuantityAvailable) {
this.stockItemID = stockItemID;
this.stockItemDescription = stockItemDescription;
this.stockItemCostPrice = stockItemCostPrice;
this.stockItemSellingPrice = stockItemSellingPrice;
this.stockItemQuantityAvailable = stockItemQuantityAvailable;
this.updateItemQuantityAvailable = updateItemQuantityAvailable;
}
public void setStockItemID(String stockItemID) {
this.stockItemID = stockItemID;
}
public String getStockItemID() {
return stockItemID;
}
public void setStockItemDescription(String stockItemDescription) {
this.stockItemDescription = stockItemDescription;
}
public String getStockItemDescription() {
return stockItemDescription;
}
public void setStockItemCostPrice(double stockItemCostPrice) {
this.stockItemCostPrice = stockItemCostPrice;
}
public double getStockItemCostPrice() {
return stockItemCostPrice;
}
public void setStockItemSellingPrice(double stockItemSellingPrice) {
this.stockItemSellingPrice = stockItemSellingPrice;
}
public double getStockItemSellingPrice() {
return stockItemSellingPrice;
}
public void setStockItemQuantityAvailable(int stockItemQuantityAvailable) {
this.stockItemQuantityAvailable = stockItemQuantityAvailable;
}
public int getStockItemQuantityAvailable() {
return stockItemQuantityAvailable;
}
public String toString() {
return (stockItemID + "\t" + stockItemDescription + "\t" + " Cost Price: $" + stockItemCostPrice + "\t" + "Selling Price: $" + stockItemSellingPrice + "\t" + "Quantity: " + stockItemQuantityAvailable + "\n");
}
public void setUpdateItemQuantityAvailable(int updateItemQuantityAvailable){
this.updateItemQuantityAvailable = updateItemQuantityAvailable;
}
public int getUpdateItemQuantityAvailable() {
return updateItemQuantityAvailable;
}
,然后方法:
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
ArrayList<StockItem> list = new ArrayList<StockItem>();
for (int i = 0; i < 2; i++) {
System.out.print(" Enter ID: ");
String stockItemID = input.next();
System.out.print(" Enter Item Description: ");
String stockItemDescription = input.next();
System.out.print(" Enter Item Cost Price: ");
double stockItemCostPrice = input.nextDouble();
System.out.print(" Enter Item Selling Price: ");
double stockItemSellingPrice = input.nextDouble();
System.out.print(" Enter Item Quantity Available: ");
int stockItemQuantityAvailable = input.nextInt();
int updateItemQuantityAvailable = (0);
list.add(new StockItem(stockItemID, stockItemDescription, stockItemCostPrice, stockItemSellingPrice, stockItemQuantityAvailable, updateItemQuantityAvailable));
list.
}
System.out.println(list.toString().replace("]", "").replace("[", "").replace(",", "").replace(" ",""));
for (StockItem data : list) {
double totalStockCost = (data.getStockItemQuantityAvailable()- data.getUpdateItemQuantityAvailable()) * (data.getStockItemCostPrice());
System.out.println(("Total Cost for ") + data.getStockItemDescription() + ": $" + totalStockCost);
}
为了更好地帮助您,请发布[SSCCE](http://sscce.org/)。 – 2013-03-17 03:43:50