Added exception

src/main/data/WatchList.java

@@ -4,6 +4,7 @@ import java.util.*;
 import java.io.*;
 import data.StockEntry;
 import ui.Main;
+import data.exceptions.*;
 
 public class WatchList implements Load,Save {
     private LinkedHashMap<String, StockEntry> listdata;
@@ -38,7 +39,10 @@ public class WatchList implements Load,Save {
     // Effects: Delete an entry with key==target
     // Modifies: this.listdata
     // Requires: target exists in list
-    public void delStock(String target) {
+    public void delStock(String target) throws StockNotExistsException {
+        if (!listdata.containsKey(target)) {
+            throw new StockNotExistsException();
+        }
         this.listdata.remove(target);
     }
 

src/main/data/exceptions/StockNotExistsException.java

@@ -0,0 +1,6 @@
+package data.exceptions;
+
+import data.exceptions.WatchListExceptions;
+
+public class StockNotExistsException extends WatchListExceptions {
+}

src/main/data/exceptions/WatchListExceptions.java

@@ -0,0 +1,4 @@
+package data.exceptions;
+
+public abstract class WatchListExceptions extends Exception {
+}

src/main/ui/Main.java

@@ -6,6 +6,7 @@ import data.StypeMap;
 import data.StockType;
 import data.WatchList;
 import ui.IfaceFactory;
+import data.exceptions.*;
 
 public class Main {
     private Iface iface;
@@ -60,7 +61,11 @@ public class Main {
     public void delWatchStock(String target) {
         //XXX Concurrency not ready
         // Should add runnable to executor
+        try {
             mainList.delStock(target);
+        } catch (StockNotExistsException e) {
+            System.out.println("Stock: " + target + " doesn't exists");
+        }
     }
 
     // Consider moving all to watchlist

src/test/data/NasdaqTest.java

@@ -1,3 +1,5 @@
+package test;
+
 import data.StypeMap;
 import data.StockType;
 import data.Nasdaq;

src/test/data/NyseTest.java

@@ -1,3 +1,5 @@
+package data;
+
 import data.StypeMap;
 import data.StockType;
 import data.Nyse;

src/test/data/StockEntryTest.java

@@ -1,3 +1,5 @@
+package data;
+
 import data.StockEntry;
 import data.StypeMap;
 import data.StockType;

src/test/data/StypeMapTest.java

@@ -1,3 +1,5 @@
+package data;
+
 import data.StypeMap;
 import data.StockType;
 import data.Nyse;

src/test/data/WatchListTest.java

@@ -1,7 +1,10 @@
+package data;
+
 import data.WatchList;
 import data.StypeMap;
 import data.StockType;
 import data.Nyse;
+import data.exceptions.*;
 import ui.Main;
 import java.io.*;
 import org.junit.jupiter.api.BeforeEach;
@@ -9,6 +12,7 @@ import org.junit.jupiter.api.Test;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
 
 public class WatchListTest {
     private WatchList watchlist;
@@ -41,17 +45,35 @@ public class WatchListTest {
     }
 
     @Test
-    public void testDelStock() {
+    public void testDelStockNoThrow() {
         StockType nyyyse = smap.getStype("Nyse");
         for (int i = 0; i < 100; i++) {
             watchlist.addStock(Integer.toString(i), nyyyse);
         }
         for (int i = 0; i < 50; i++) {
+            try {
                 watchlist.delStock(Integer.toString(i));
+            } catch (WatchListExceptions e) {
+                fail();
+            }
         }
         assertEquals(watchlist.size(), 50);
     }
 
+    @Test
+    public void testDelNotExistsStock() {
+        StockType nyyyse = smap.getStype("Nyse");
+        for (int i = 0; i < 100; i++) {
+            watchlist.addStock(Integer.toString(i), nyyyse);
+        }
+        try {
+            watchlist.delStock(Integer.toString(-1));
+            fail();
+        } catch (WatchListExceptions e) {
+            //expected to throw
+        }
+    }
+
     @Test
     public void testSaveLoad() {
         StockType nyyyse = smap.getStype("Nyse");