Made Item and ItemOverview abstract

src/main/java/no/ntnu/idatt1002/demo/data/Economics/Item.java

@@ -70,7 +70,7 @@ public abstract class Item {
      */
     public void setAmount(double amount) {
         if(amount <= 1.0f ) {
-            throw new IllegalArgumentException("A positive amount must be provided.");
+            throw new IllegalArgumentException("A positive amount must be provided");
         }
         this.amount = amount;
     }

src/main/java/no/ntnu/idatt1002/demo/data/Economics/ItemOverview.java

@@ -3,7 +3,7 @@ package no.ntnu.idatt1002.demo.data.Economics;
 import java.util.ArrayList;
 
 /**
- * ItemOverview is an abstract class for storing and getting
+ * ItemOverview is an abstract class for storing and getting.
  * information on items. Superclass for Income- and ExpenseOverview.
  */
 public abstract class ItemOverview {
@@ -17,8 +17,8 @@ public abstract class ItemOverview {
     }
 
     /**
-     * Class constructor that takes in an ArrayList of Item´s as argument
-     * @param items   An ArrayList of the Item´s you want to overview
+     * Class constructor that takes in an ArrayList of Item´s as argument.
+     * @param items   An ArrayList of the Item´s you want to overview.
      */
     public ItemOverview(ArrayList<Item> items){
         this.items = items;
@@ -44,8 +44,8 @@ public abstract class ItemOverview {
     }
 
     /**
-     * Get the sum of all Item´s in items
-     * @return   Sum of all Item´s
+     * Get the sum of all Item´s in items.
+     * @return   Sum of all Item´s.
      */
     public double getTotalSum(){
         return items.stream().map(Item::getAmount).mapToDouble(Double::doubleValue).sum();