did a few

src/main/java/rocks/zipcode/io/quiz4/collections/ComparableTreeSet.java

@@ -1,17 +1,32 @@
 package rocks.zipcode.io.quiz4.collections;
 
+import java.util.Arrays;
+import java.util.TreeSet;
+
 /**
  * @author leon on 11/12/2018.
  */
-public class ComparableTreeSet<_> {
-    public ComparableTreeSet(_... arr) {
-    }
+public class ComparableTreeSet<T> extends TreeSet implements Comparable{
 
+    @SafeVarargs
+    public ComparableTreeSet(T... arr) {
 
+    }
     public ComparableTreeSet() {
     }
 
-    public Integer compareTo(ComparableTreeSet<_> o) {
+    public Integer compareTo(ComparableTreeSet<T> o) {
+
         return null;
     }
+
+    @Override
+    public int compareTo(Object o) {
+        return 0;
+    }
+
+    @Override
+    public String toString() {
+       return Arrays.toString(this.toArray());
+    }
 }

src/main/java/rocks/zipcode/io/quiz4/collections/SimpleStringGroup.java

@@ -1,31 +1,59 @@
 package rocks.zipcode.io.quiz4.collections;
 
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
 /**
  * @author leon on 11/12/2018.
  */
-public class SimpleStringGroup {
+public class SimpleStringGroup implements Iterable {
+    private ArrayList<String> list = new ArrayList<>();
+
     public SimpleStringGroup() {
-        throw new UnsupportedOperationException("Method not yet implemented");
+
     }
 
     public Integer count() {
-        return null;
+        return list.size();
     }
 
     public void insert(String string) {
+        list.add(string);
     }
 
     public Boolean has(String valueToInsert) {
-        return null;
+        return list.contains(valueToInsert);
     }
 
     public String fetch(int indexOfValue) {
-        return null;
+        return list.get(indexOfValue);
     }
 
     public void delete(String valueToInsert) {
+        list.remove(valueToInsert);
     }
 
     public void clear() {
+        list.clear();
+    }
+
+    @Override
+    public Iterator iterator() {
+        return new Iterator() {
+            int i = 0;
+            @Override
+            public boolean hasNext() {
+                return i < list.size();
+            }
+            @Override
+            public Object next() {
+                if (!hasNext()) {
+                    throw new NoSuchElementException("blank");
+                } else {
+                    return list.get(i++);
+                }
+            }
+        };
     }
 }

src/main/java/rocks/zipcode/io/quiz4/collections/ZipCodeWilmington.java

@@ -2,23 +2,31 @@ package rocks.zipcode.io.quiz4.collections;
 
 import rocks.zipcode.io.quiz4.objectorientation.Student;
 
+import java.util.ArrayList;
 import java.util.Map;
+import java.util.TreeMap;
 
 /**
  * @author leon on 11/12/2018.
  */
 public class ZipCodeWilmington {
+    ArrayList<Student> studentList = new ArrayList<>();
+
     public void enroll(Student student) {
+        studentList.add(student);
     }
 
     public Boolean isEnrolled(Student student) {
-        return null;
+        return studentList.contains(student);
     }
 
     public void lecture(double numberOfHours) {
+        studentList.forEach(Student -> Student.learn(numberOfHours));
     }
 
     public Map<Student, Double> getStudyMap() {
-        return null;
+        TreeMap<Student, Double> temp = new TreeMap<>();
+        studentList.forEach(Student -> temp.put(Student, Student.getTotalStudyTime()));
+        return temp;
     }
 }

src/main/java/rocks/zipcode/io/quiz4/fundamentals/PalindromeEvaluator.java

@@ -5,6 +5,9 @@ package rocks.zipcode.io.quiz4.fundamentals;
  */
 public class PalindromeEvaluator {
     public static String[] getAllPalindromes(String string) {
+
+
+
         return null;
     }
 

src/main/java/rocks/zipcode/io/quiz4/objectorientation/Student.java

@@ -4,17 +4,22 @@ package rocks.zipcode.io.quiz4.objectorientation;
  * @author leon on 11/12/2018.
  */
 public class Student {
+    Integer id;
+    Double hoursTaught;
+
     public Student() {
         this(null);
     }
 
     public Student(Integer id) {
+        this.id = id;
     }
 
     public void learn(Double amountOfHours) {
+        hoursTaught += amountOfHours;
     }
 
     public Double getTotalStudyTime() {
-        return null;
+        return hoursTaught;
     }
 }

src/test/java/rocks/zipcode/io/quiz4/collections/zipcodewilmington/EnrollTest.java

@@ -18,7 +18,8 @@ public class EnrollTest {
     public void test2() {
         test(
                 new Student(),
-                new Student());
+                new Student()
+        );
     }
 
     @Test