Merge

src/main/java/millions/model/Exchange.java

@@ -2,10 +2,13 @@
 
 import java.math.BigDecimal;
 import java.math.RoundingMode;
+import java.util.Collection;
+import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Random;
+import java.util.stream.Collectors;
 
 public class Exchange {
   private String name;
@@ -67,6 +70,22 @@ public List<Stock> findStocks(String searchTerm) {
         .toList();
   }
 
+  public List<Stock> getGainers(int limit) {
+    Collection<Stock> stocksCollection = stocks.values();
+    return stocksCollection.stream()
+        .sorted(Comparator.comparing(Stock::getLatestPriceChange).reversed())
+        .limit(limit)
+        .collect(Collectors.toList());
+  }
+
+  public List<Stock> getLosers(int limit) {
+    Collection<Stock> stocksCollection = stocks.values();
+    return stocksCollection.stream()
+        .sorted(Comparator.comparing(Stock::getLatestPriceChange))
+        .limit(limit)
+        .collect(Collectors.toList());
+  }
+
   public void advance() {
     this.weekNumber++;
     for (Stock stock : this.stocks.values()) {

src/main/java/millions/model/Player.java

@@ -9,7 +9,7 @@ public class Player {
   private BigDecimal money;
   private Portfolio portfolio;
   private TransactionArchive transactionArchive;
-  //temporary attribute until a better solution is found
+  // temporary attribute until a better solution is found
   public int weeksTraded;
 
   public Player(String name, BigDecimal startingMoney) {
@@ -42,12 +42,6 @@ public void withdrawMoney(BigDecimal amount) {
     this.money = this.money.subtract(amount);
   }
 
-  public BigDecimal getNetWorth() {
-    BigDecimal netWorth = this.money;
-    netWorth = netWorth.add(this.portfolio.getNetWorth());
-    return netWorth;
-  }
-
   public String getStatus() {
     String status = "Novice";
     BigDecimal netWorth = getNetWorth();
@@ -73,6 +67,10 @@ public Portfolio getPortfolio() {
     return this.portfolio;
   }
 
+  public BigDecimal getNetWorth() {
+    return this.money.add(this.portfolio.getNetWorth());
+  }
+
   public TransactionArchive getTransactionArchive() {
     return this.transactionArchive;
   }

src/main/java/millions/model/Portfolio.java

@@ -1,10 +1,9 @@
 package millions.model;
 
-import millions.model.calculators.SaleCalculator;
-
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import millions.model.calculators.SaleCalculator;
 
 public class Portfolio {
   List<Share> shares;
@@ -32,11 +31,12 @@ public List<Share> getShares(String symbol) {
   }
 
   public BigDecimal getNetWorth() {
-    BigDecimal netWorth = new BigDecimal(0);
+    BigDecimal total = BigDecimal.ZERO;
     for (Share share : shares) {
-      netWorth = netWorth.add(new SaleCalculator(share).calculateTotal());
+      BigDecimal value = new SaleCalculator(share).calculateTotal();
+      total = total.add(value);
     }
-    return netWorth;
+    return total;
   }
 
   public boolean contains(Share share) {

src/main/java/millions/model/Stock.java

@@ -68,6 +68,10 @@ public BigDecimal getLowestPrice() {
   }
 
   public BigDecimal getLatestPriceChange() {
+    if (this.prices.size() < 2) {
+      return BigDecimal.ZERO;
+    }
+
     BigDecimal currentPrice = this.prices.getLast();
     BigDecimal lastPrice = this.prices.get(this.prices.size() - 2);