test&lab

DataLabs/lab5/StockLedger.java

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+public class StockLedger {
+    private QueueInterface<StockPurchase> ledger;
+
+    public StockLedger() {
+        ledger = new LinkedQueue<>();
+ }
+
+ public void buy(int sharesBought, double pricePerShare){
+     while(!SharesBought) {
+        StockPurchase purchase = new StockPurchase(pricePerShare);
+        ledger.enqueue(purchase);
+        sharesBought--;
+     }
+    }
+
+ public double sell(int sharesSold, double pricePerShare){
+    double saleAmount = sharesSold*pricePerShare;
+    double totalCost = 0;
+
+    while (!sharesSold){
+        StockPurchase share = ledger.dequeue();
+        double shareCost = share.getCostPerShare();
+        totalCost += shareCost;
+        sharesSold--;
+    }
+
+    return saleAmount - totalCost;
+ }
+}