feat(Exchange): Set gainers/losers to percent change instead of chang…

…e value.

src/main/java/edu/ntnu/idi/idatt/model/Exchange.java

@@ -114,16 +114,16 @@ public List<Stock> findStocks(String searchTerm) {
    *
    * <p>
    * Returns the stocks that have done it the best
-   * in the latest week.
+   * (percent change) in the latest week.
    * </p>
    *
    * @param limit - Amount of stocks to be returned.
    * @return A list of stocks sorted in declining order.
    */
   public List<Stock> getGainers(int limit) {
     return stockMap.values().stream()
-        .filter(stock -> stock.getLatestPriceChange().compareTo(BigDecimal.ZERO) > 0)
-        .sorted(Comparator.comparing(Stock::getLatestPriceChange).reversed())
+        .filter(stock -> stock.getLatestPriceChangePercent().compareTo(BigDecimal.ZERO) > 0)
+        .sorted(Comparator.comparing(Stock::getLatestPriceChangePercent).reversed())
         .limit(limit)
         .toList();
   }
@@ -133,16 +133,16 @@ public List<Stock> getGainers(int limit) {
    *
    * <p>
    * Returns the stocks that have done it the worst
-   * in value in the latest week.
+   * in percent change in the latest week.
    * </p>
    *
    * @param limit - Amount of stocks to be returned.
-   * @return A list of stocks sorted in inclining order.
+   * @return A list of stocks sorted in ascending order.
    */
   public List<Stock> getLosers(int limit) {
     return stockMap.values().stream()
-        .filter(stock -> stock.getLatestPriceChange().compareTo(BigDecimal.ZERO) < 0)
-        .sorted(Comparator.comparing(Stock::getLatestPriceChange))
+        .filter(stock -> stock.getLatestPriceChangePercent().compareTo(BigDecimal.ZERO) < 0)
+        .sorted(Comparator.comparing(Stock::getLatestPriceChangePercent))
         .limit(limit)
         .toList();
   }