DID IT

src/main/java/com/zipcodewilmington/arrayutility/ArrayUtility.java

@@ -1,7 +1,88 @@
 package com.zipcodewilmington.arrayutility;
 
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static java.lang.Math.toIntExact;
+
 /**
  * Created by leon on 3/6/18.
  */
-public class ArrayUtility {
-}
+public class ArrayUtility<T> {
+
+    T[] inputArray;
+
+    public ArrayUtility(T[] inputArray) {
+        this.inputArray = inputArray;
+    }
+
+    private Stream<T> getTStream(T[] array) {
+        return Arrays.stream(array);
+    }
+
+    public T getMostCommonFromMerge(T[] arrayToMerge) {
+        Stream<T> inputStream = getTStream(inputArray);
+        Stream<T> toMergeStream = getTStream(arrayToMerge);
+        Stream<T> mergedStream = Stream.concat(inputStream,toMergeStream);
+        return mergedStream
+                .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()))
+                .entrySet()
+                .stream()
+                .max((entry1, entry2) -> entry1.getValue() > entry2.getValue() ? 1 : -1)
+                .get()
+                .getKey()
+                ;
+    }
+
+    public Integer countDuplicatesInMerge(T[] arrayToMerge, T valueToEvaluate) {
+        Stream<T> inputStream = getTStream(inputArray);
+        Stream<T> toMergeStream = getTStream(arrayToMerge);
+        Stream<T> mergedStream = Stream.concat(inputStream,toMergeStream);
+        Long result =  mergedStream
+                .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()))
+                .entrySet()
+                .stream()
+                .max((e1, e2) -> e1.getValue() > e2.getValue() ? 1 : -1)
+                .get()
+                .getValue()
+                ;
+        return toIntExact(result);
+    }
+
+    public Integer getNumberOfOccurrences(T valueToEvaluate) {
+        return toIntExact(getTStream(inputArray)
+                    .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()))
+                    .entrySet()
+                    .stream()
+                    .filter(e -> e.getKey().equals(valueToEvaluate))
+                    .map(Map.Entry::getValue)
+                    .findFirst()
+                    .orElse(null)
+                );
+    }
+
+    public T[] removeValue(T valueToRemove) {
+        // UGH this doesn't work for stupid Java reasons
+//        T[] actual = (T[]) getTStream(inputArray)
+//                .filter(t -> !t.equals(valueToRemove))
+//                .toArray((Object[]::new));
+
+        ArrayList<T> arrayList = new ArrayList<>();
+
+        for (T t : inputArray) {
+            if (!t.equals(valueToRemove)) {
+                arrayList.add(t);
+            }
+        }
+
+        inputArray = (T[]) Array.newInstance(inputArray.getClass().getComponentType(), arrayList.size());
+
+        return arrayList.toArray(inputArray);
+    }
+
+}

src/test/java/com/zipcodewilmington/arrayutility/RemoveValueTest.java

@@ -1,6 +1,6 @@
 package com.zipcodewilmington.arrayutility;
 
-import com.zipcodewilmington.UnitTestingUtils;
+//import com.zipcodewilmington.UnitTestingUtils;
 import org.junit.Test;
 
 /**