Pilgrim:

- Add static count of object. Increment in constructor and decrement in overidden 'finalize' method
	- Throw IllegalArgumentException instead of Exception for passport and age

src/Pilgrim.java

@@ -1,5 +1,8 @@
 public class Pilgrim {
 
+    //keep track of all pilgrim object count.
+    private static int totalPilgrims;
+
     private String passport;
     private boolean local;
     private int age;
@@ -12,20 +15,26 @@ public class Pilgrim {
         setPassport(passport);
         this.gender = gender;
         this.priority = priority;
+        totalPilgrims++; //Added a pilgrim
     }
-    public Priority getPriority() {
-        return priority;
-    }
+    public Priority getPriority() { return priority; }
 
-    private void setAge(int age) throws Exception {
-        if (age < 7 || age > 85) throw new Exception("Age out of permitted range");
+    private void setAge(int age) throws IllegalArgumentException {
+        if (age < 7 || age > 85) throw new IllegalArgumentException("Age out of permitted range");
         else this.age = age;
     }
 
-    private void setPassport(String passport) throws Exception {
+    private void setPassport(String passport) throws IllegalArgumentException{
         if (passport.length() == 8) //assuming standard passport number lengths
             this.passport = passport;
-        else throw new Exception("Invalid passport format");
+        else throw new IllegalArgumentException("Invalid passport format");
         //TODO:Make exception classes
     }
+
+    @Override
+    protected void finalize() throws Throwable {
+        super.finalize();
+        //Decrement the count of total objects when GC cleans unneeded.
+        totalPilgrims--;
+    }
 }