Some changes done

ExchangeList.java

@@ -70,7 +70,7 @@ public void Delete(Exchange e)
 			}
 			temp = temp.next;
 		}
-		throw new RuntimeException("Error - Exchange " + e.id + " is not present in list");
+		throw new RuntimeException("Error - Exchange with identifier " + e.id + " is not present in the list");
 	}
 
 	public int size()

Makefile

@@ -1,13 +1,7 @@
 all:
-	javac assn3checker.java
-	javac Myset.java
-	javac MobilePhone.java
-	javac MobilePhoneSet.java
-	javac Exchange.java
-	javac ExchangeList.java
-	javac RoutingMapTree.java
+	javac *.java
 	java assn3checker
 
 clean:
-	find . -name "*.class" -type f -delete
+	rm *.class
 	clear

MobilePhone.java

@@ -43,6 +43,6 @@ public void switchOff()
 	public Exchange location()
 	{
 		if(status) return exchange;
-		throw new RuntimeException("Error - Mobilephone " + number() + " is switched off");
+		throw new RuntimeException("Error - Mobile phone with identifier " + number() + " is currently switched off");
 	}
 }

MobilePhoneSet.java

@@ -11,18 +11,19 @@ public MobilePhoneSet()
 
 	public void Insert(MobilePhone mobile)
 	{
-		mobileSet.Insert(mobile);
+		try { mobileSet.Insert(mobile); }
+		catch(RuntimeException ex)
+		{
+			throw new RuntimeException("Error - Mobile phone with identifier " + mobile.number() + " is already present in this resident set");
+		}
 	}
 
 	public void Delete(MobilePhone mobile)
 	{
-		try
-		{
-			mobileSet.Delete(mobile);
-		}
+		try { mobileSet.Delete(mobile); }
 		catch(RuntimeException e)
 		{
-			throw e;
+			throw new RuntimeException("Error - Mobile phone with identifier " + mobile.number() + " is not present in this resident set");
 		}
 	}
 

Myset.java

@@ -33,7 +33,7 @@ public boolean IsMember(Object o)
 
 	public void Insert(Object o)
 	{
-		if(IsMember(o)) return;
+		if(IsMember(o)) throw new RuntimeException("Error - Object is already in the set");
 		Node tmp = new Node(o);
 		if(head==null)
 		{
@@ -77,7 +77,8 @@ public Myset Union(Myset a)
 		temp = a.head;
 		while(temp != null)
 		{
-			if(!union.IsMember(temp.obj)) union.Insert(temp.obj);
+			try { union.Insert(temp.obj); }
+			catch(RuntimeException ex) {}
 			temp = temp.next;
 		}
 		return union;
@@ -119,21 +120,4 @@ public Object[] getItems()
 		}
 		return objs;
 	}
-
-	/*public static void main(String[] args)
-	{
-		Myset a = new Myset();
-		System.out.println(a.IsEmpty());
-		a.Insert(1529); a.Insert(99); a.Insert(455); a.Insert(99);
-		System.out.println(a.IsEmpty());
-		System.out.println(a.size());
-		System.out.println(a.IsMember(455));
-		System.out.println(a.getItems()[1]);
-		//a.Delete(15);
-		System.out.println(a.getItems()[1]);
-		Myset b = new Myset(); //b.Insert(99); b.Insert(656); b.Insert(34); b.Insert(1529);
-		Myset c = b.Union(a);
-		c = b.Intersection(a);
-		System.out.println(c.size());
-	}*/
 }