Add better error message to failure based on accidental public method.

tests/edu/caltech/cs2/interfaces/IStyleTests.java

@@ -131,16 +131,22 @@ public interface IStyleTests {
                 }
 
                 if (Modifier.isPublic(m.getModifiers())) {
-                    for (int i = 0; i < 100; i++) {
-                        if (m.getParameterCount() == 0) {
-                            m.invoke(o);
-                        } else if (m.getParameterCount() == 1) {
-                            Class<?>[] clazes = m.getParameterTypes();
-                            m.invoke(o, getArg(clazes[0]));
-                        } else if (m.getParameterCount() == 2) {
-                            Class<?>[] clazes = m.getParameterTypes();
-                            m.invoke(o, getArg(clazes[0]), getArg(clazes[1]));
+                    try {
+                        for (int i = 0; i < 100; i++) {
+                            if (m.getParameterCount() == 0) {
+                                m.invoke(o);
+                            } else if (m.getParameterCount() == 1) {
+                                Class<?>[] clazes = m.getParameterTypes();
+                                m.invoke(o, getArg(clazes[0]));
+                            } else if (m.getParameterCount() == 2) {
+                                Class<?>[] clazes = m.getParameterTypes();
+                                m.invoke(o, getArg(clazes[0]), getArg(clazes[1]));
+                            }
                         }
+                    } catch (IllegalArgumentException e) {
+                        System.out.println("You have a method that should be private that is public.");
+                        System.out.println("Take a look at your method: " + m);
+                        throw e;
                     }
                 }
                 assertTrue(NewMe.NUM_CALLS == 0, "Calls to " + m.getName() + " should not create a new instance of " + getClazz().getName());