Remove 'public abstract' from methods in IMoney.java

By default, methods in an interface are public and abstract.
Closes #1033

Author: sakky11

src/test/java/junit/samples/money/IMoney.java

@@ -7,45 +7,45 @@ public interface IMoney {
     /**
      * Adds a money to this money.
      */
-    public abstract IMoney add(IMoney m);
+    IMoney add(IMoney m);
 
     /**
      * Adds a simple Money to this money. This is a helper method for
      * implementing double dispatch
      */
-    public abstract IMoney addMoney(Money m);
+    IMoney addMoney(Money m);
 
     /**
      * Adds a MoneyBag to this money. This is a helper method for
      * implementing double dispatch
      */
-    public abstract IMoney addMoneyBag(MoneyBag s);
+    IMoney addMoneyBag(MoneyBag s);
 
     /**
      * Tests whether this money is zero
      */
-    public abstract boolean isZero();
+    boolean isZero();
 
     /**
      * Multiplies a money by the given factor.
      */
-    public abstract IMoney multiply(int factor);
+    IMoney multiply(int factor);
 
     /**
      * Negates this money.
      */
-    public abstract IMoney negate();
+    IMoney negate();
 
     /**
      * Subtracts a money from this money.
      */
-    public abstract IMoney subtract(IMoney m);
+    IMoney subtract(IMoney m);
 
     /**
      * Append this to a MoneyBag m.
      * appendTo() needs to be public because it is used
      * polymorphically, but it should not be used by clients
      * because it modifies the argument m.
      */
-    public abstract void appendTo(MoneyBag m);
-}
+    void appendTo(MoneyBag m);
+}