code portfolio class

the code for the portfoli class

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/Portfolio.java

@@ -0,0 +1,41 @@
+package edu.ntnu.idi.idatt2003.g40.mappe;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class Portfolio {
+
+    private final List<Share> shares = new ArrayList<>();
+
+    public Portfolio() {
+        // Intentionally empty
+    }
+
+    public boolean addShare(Share share) {
+        Objects.requireNonNull(share, "share cannot be null");
+        return shares.add(share);
+    }
+
+    public boolean removeShare(Share share) {
+        Objects.requireNonNull(share, "share cannot be null");
+        return shares.remove(share);
+    }
+
+
+    public List<Share> getShares() {
+        return List.copyOf(shares);
+    }
+
+    public List<Share> getShares(String symbol) {
+        Objects.requireNonNull(symbol, "symbol cannot be null");
+        return shares.stream()
+                .filter(s -> symbol.equalsIgnoreCase(s.getStock().getSymbol()))
+                .toList();
+    }
+
+    public boolean contains(Share share) {
+        Objects.requireNonNull(share, "share cannot be null");
+        return shares.contains(share);
+    }
+}