implement skeleton for Exchange class

src/main/java/edu/ntnu/idi/idatt2003/gruppe42/Model/Exchange.java

@@ -1,4 +1,55 @@
 package edu.ntnu.idi.idatt2003.gruppe42.Model;
 
+import edu.ntnu.idi.idatt2003.gruppe42.Model.Transaction.Transaction;
+
+import java.math.BigDecimal;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+
 public class Exchange {
+  private String name;
+  private int week;
+  private Map<String, Stock> stockMap;
+  private Random random;
+
+  public Exchange(String name, List<Stock> stocks) {
+    this.name = name;
+    this.week = 0;
+    this.stockMap = new HashMap<String, Stock>();
+    this.random = new Random();
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public int getWeek() {
+    return week;
+  }
+
+  public boolean hasStock(String symbol) {
+    return true;
+  }
+
+  public Stock getStock(String symbol) {
+    return null;
+  }
+
+  public List<Stock> findStocks(String searchTerm) {
+    return null;
+  }
+
+  public Transaction buy(String symbol, BigDecimal quantity, Player player) {
+    return null;
+  }
+
+  public Transaction sell(Share share, Player player) {
+    return null;
+  }
+
+  public void advance() {
+    week += 1;
+  }
 }