Rolled back to before 10 becuase I broke everything; now reaching step 10 again

.idea/workspace.xml

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+      <window_info anchor="right" content_ui="combo" id="Hierarchy" order="8" weight="0.25" />
+    </layout-to-restore>
   </component>
   <component name="TypeScriptGeneratedFilesManager">
     <option name="version" value="1" />
@@ -568,20 +540,7 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/Teacher.java">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="30">
-          <caret line="2" column="23" selection-start-line="2" selection-start-column="23" selection-end-line="2" selection-end-column="23" />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Teacher.java">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="135">
-          <caret line="9" lean-forward="true" selection-start-line="9" selection-end-line="9" />
-        </state>
-      </provider>
-    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/Teacher.java" />
     <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/InstructorTest.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="255">
@@ -614,36 +573,17 @@
     </entry>
     <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/PeopleTest.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="360">
-          <caret line="113" column="49" selection-start-line="113" selection-start-column="49" selection-end-line="113" selection-end-column="49" />
+        <state relative-caret-position="165">
+          <caret line="13" selection-start-line="13" selection-end-line="13" />
           <folding>
             <element signature="imports" expanded="true" />
-            <element signature="e#184#185#0" expanded="true" />
-            <element signature="e#219#220#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Person.java">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="210">
-          <caret line="14" column="5" selection-start-line="14" selection-start-column="5" selection-end-line="14" selection-end-column="5" />
-          <folding>
-            <element signature="e#191#192#0" expanded="true" />
-            <element signature="e#219#220#0" expanded="true" />
-            <element signature="e#104#105#0" expanded="true" />
-            <element signature="e#129#130#0" expanded="true" />
-            <element signature="e#182#183#0" expanded="true" />
-            <element signature="e#209#210#0" expanded="true" />
-            <element signature="e#249#250#0" expanded="true" />
-            <element signature="e#281#282#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/StudentsTest.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="105">
+        <state relative-caret-position="90">
           <caret line="7" column="57" selection-start-line="7" selection-start-column="57" selection-end-line="7" selection-end-column="57" />
           <folding>
             <element signature="imports" expanded="true" />
@@ -651,21 +591,10 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Instructor.java">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="60">
-          <caret line="4" column="42" selection-start-line="4" selection-start-column="42" selection-end-line="4" selection-end-column="42" />
-          <folding>
-            <element signature="e#125#126#0" expanded="true" />
-            <element signature="e#150#151#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Instructors.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="195">
-          <caret line="13" column="44" selection-start-line="13" selection-start-column="44" selection-end-line="13" selection-end-column="44" />
+        <state relative-caret-position="240">
+          <caret line="17" column="11" selection-start-line="17" selection-start-column="11" selection-end-line="17" selection-end-column="11" />
         </state>
       </provider>
     </entry>
@@ -679,70 +608,73 @@
     <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Students.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="135">
-          <caret line="9" column="36" lean-forward="true" selection-start-line="9" selection-start-column="36" selection-end-line="9" selection-end-column="36" />
-          <folding>
-            <element signature="e#197#198#0" expanded="true" />
-            <element signature="e#227#228#0" expanded="true" />
-          </folding>
+          <caret line="9" column="9" selection-start-line="9" selection-start-column="9" selection-end-line="9" selection-end-column="9" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/People.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="420">
+          <caret line="35" column="5" selection-start-line="35" selection-start-column="5" selection-end-line="35" selection-end-column="5" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/TestStudent.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="315">
+          <caret line="25" column="15" selection-start-line="25" selection-end-line="26" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Teacher.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="30">
+          <caret line="2" column="17" selection-start-line="2" selection-start-column="17" selection-end-line="2" selection-end-column="17" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Student.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="180">
-          <caret line="12" selection-start-line="12" selection-end-line="12" />
-          <folding>
-            <element signature="e#147#148#0" expanded="true" />
-            <element signature="e#172#173#0" expanded="true" />
-            <element signature="e#216#217#0" expanded="true" />
-            <element signature="e#300#301#0" expanded="true" />
-            <element signature="e#337#338#0" expanded="true" />
-          </folding>
+        <state relative-caret-position="30">
+          <caret line="2" column="35" selection-start-line="2" selection-start-column="35" selection-end-line="2" selection-end-column="35" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/People.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Instructor.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="570">
-          <caret line="38" column="41" selection-start-line="38" selection-start-column="41" selection-end-line="38" selection-end-column="41" />
-          <folding>
-            <element signature="e#164#172#0" expanded="true" />
-            <element signature="e#203#204#0" expanded="true" />
-            <element signature="e#228#229#0" expanded="true" />
-            <element signature="e#279#280#0" expanded="true" />
-            <element signature="e#304#305#0" expanded="true" />
-            <element signature="e#331#332#0" expanded="true" />
-            <element signature="e#356#357#0" expanded="true" />
-            <element signature="e#433#434#0" expanded="true" />
-            <element signature="e#458#459#0" expanded="true" />
-            <element signature="e#786#787#0" expanded="true" />
-            <element signature="e#829#830#0" expanded="true" />
-            <element signature="e#882#883#0" expanded="true" />
-            <element signature="e#916#917#0" expanded="true" />
-          </folding>
+        <state relative-caret-position="90">
+          <caret line="9" column="8" selection-start-line="9" selection-start-column="8" selection-end-line="9" selection-end-column="8" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/TestStudent.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/ZipCodeWilmington.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="315">
-          <caret line="25" column="15" selection-start-line="25" selection-end-line="26" />
-          <folding>
-            <marker date="1541270715088" expanded="true" signature="135:199" ph="..." />
-          </folding>
+        <state relative-caret-position="45">
+          <caret line="3" column="13" selection-start-line="3" selection-start-column="13" selection-end-line="3" selection-end-column="13" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/ZipCodeWilmingtonTest.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="240">
-          <caret line="16" column="48" lean-forward="true" selection-start-line="16" selection-start-column="48" selection-end-line="16" selection-end-column="48" />
+        <state relative-caret-position="150">
+          <caret line="10" selection-start-line="10" selection-end-line="10" />
           <folding>
             <element signature="imports" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Person.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="195">
+          <caret line="13" column="20" selection-start-line="13" selection-start-column="20" selection-end-line="13" selection-end-column="20" />
+          <folding>
+            <element signature="e#225#226#0" expanded="true" />
+            <element signature="e#253#254#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
   </component>
   <component name="masterDetails">
     <states>

src/main/java/io/zipcoder/interfaces/ZipCodeWilmington.java

@@ -0,0 +1,20 @@
+package io.zipcoder.interfaces;
+
+public enum ZipCodeWilmington {
+    INSTANCE;
+
+    Students students = Students.getInstance();
+    Instructors instructors = Instructors.getInstance();
+
+    public void hostLecture(Teacher teacher, double numberOfHours) {
+        Student[] studentsArray = (Student[]) students.studentList.getArray();
+        teacher.lecture(studentsArray, numberOfHours);
+    }
+
+    public void hostLecture(long id, double numberOfHours) {
+        Student[] studentsArray = (Student[]) students.studentList.getArray();
+        Teacher teacher = (Teacher) instructors.instructorList.findByID(id);
+        teacher.lecture(studentsArray, numberOfHours);
+    }
+
+}

src/test/java/io/zipcoder/interfaces/ZipCodeWilmingtonTest.java

@@ -7,12 +7,13 @@ public class ZipCodeWilmingtonTest {
 
     @Test
     public void testHostLecture() {
-        Students students = Students.getInstance();
-        Student[] studentListArray = (Student[]) students.studentList.getArray();
+        ZipCodeWilmington zcw = ZipCodeWilmington.INSTANCE;
+        Student[] studentsArray = (Student[]) zcw.students.studentList.getArray();
+        Instructor[] instructorsArray = (Instructor[]) zcw.instructors.instructorList.getArray();
 
-        double before = studentListArray[0].getTotalStudyTime();
-        ZipCodeWilmington.hostLecture(1, students.studentList);
-        double after = studentListArray[0].getTotalStudyTime();
+        double before = studentsArray[0].getTotalStudyTime();
+        zcw.hostLecture(instructorsArray[0], 1);
+        double after = studentsArray[0].getTotalStudyTime();
 
         Assert.assertTrue(after-before == 1/39);
     }