pom.xml

@@ -7,6 +7,18 @@
     <groupId>com.zipcodewilmington.labs</groupId>
     <artifactId>arrayutils</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
     <dependencies>
         <dependency>
             <groupId>junit</groupId>

src/main/java/com/zipcodewilmington/StringArrayUtils.java

@@ -1,5 +1,8 @@
 package com.zipcodewilmington;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+
 /**
  * Created by leon on 1/29/18.
  */
@@ -9,31 +12,35 @@ public class StringArrayUtils {
      * @return first element of specified array
      */ // TODO
     public static String getFirstElement(String[] array) {
-        return null;
+
+        return array[0];
     }
 
     /**
      * @param array array of String objects
      * @return second element in specified array
      */
-    public static String getSecondElement(String[] array) {
-        return null;
+    public static String getSecondElement(String[] array)
+    {
+        return array[1];
     }
 
     /**
      * @param array array of String objects
      * @return last element in specified array
      */ // TODO
-    public static String getLastElement(String[] array) {
-        return null;
+    public static String getLastElement(String[] array)
+    {
+        return array[array.length -1];
     }
 
     /**
      * @param array array of String objects
      * @return second to last element in specified array
      */ // TODO
-    public static String getSecondToLastElement(String[] array) {
-        return null;
+    public static String getSecondToLastElement(String[] array)
+    {
+        return array[array.length -2];
     }
 
     /**
@@ -42,7 +49,22 @@ public class StringArrayUtils {
      * @return true if the array contains the specified `value`
      */ // TODO
     public static boolean contains(String[] array, String value) {
-        return false;
+       /*boolean result= false;
+        for(int i=0; i<array.length;i++)
+        {
+            if (array[i].equals(value) )
+            {
+                 result=true;
+            }
+            else
+                {
+                     result=  false;
+                }
+        }
+        return result;*/
+
+        boolean result  = Arrays.stream(array).anyMatch(value :: equals);
+       return result;
     }
 
     /**
@@ -50,7 +72,17 @@ public class StringArrayUtils {
      * @return an array with identical contents in reverse order
      */ // TODO
     public static String[] reverse(String[] array) {
-        return null;
+        String[] result =new String[array.length];
+        int j=0;
+
+        for(int i =array.length-1; i>=0; i--)
+        {
+            result[j]=  array[i];
+            j++;
+        }
+
+
+        return result;
     }
 
     /**
@@ -58,7 +90,32 @@ public class StringArrayUtils {
      * @return true if the order of the array is the same backwards and forwards
      */ // TODO
     public static boolean isPalindromic(String[] array) {
-        return false;
+        boolean result = false;
+        if ((array.length % 2) == 0)
+        {
+            for (int i = 0; i <= array.length - 1; i++)
+            {
+                if (array[i] == array[array.length - i - 1])
+                {
+                    result = true;
+                } else
+                    {
+                    result = false;
+                }
+            }
+        }
+        else// odd
+            {
+            for (int i = 0; i <= (array.length - 1) / 2 - 1; i++) {
+                if (array[i] == array[array.length - i - 1]) {
+                    result = true;
+                } else {
+                    result = false;
+                }
+            }
+
+        }
+        return result;
     }
 
     /**
@@ -66,7 +123,21 @@ public class StringArrayUtils {
      * @return true if each letter in the alphabet has been used in the array
      */ // TODO
     public static boolean isPangramic(String[] array) {
-        return false;
+        boolean result =true;
+        String lower="";
+        for(String var :array)
+        {
+            lower= lower.concat(var.toLowerCase());
+        }
+        for(int i=97;i<=122;i++)
+        {
+            if(!lower.contains(Character.toString((char)i))){
+                result=false;
+            }
+        }
+
+
+        return result;
     }
 
     /**
@@ -74,8 +145,17 @@ public class StringArrayUtils {
      * @param value value to check array for
      * @return number of occurrences the specified `value` has occurred
      */ // TODO
-    public static int getNumberOfOccurrences(String[] array, String value) {
-        return 0;
+    public static int getNumberOfOccurrences(String[] array, String value)
+    {
+        int count=0;
+        for(int i=0; i<array.length;i++)
+        {
+            if(array[i]== value)
+            {
+                count=count+1;
+            }
+        }
+        return count;
     }
 
     /**
@@ -84,7 +164,19 @@ public class StringArrayUtils {
      * @return array with identical contents excluding values of `value`
      */ // TODO
     public static String[] removeValue(String[] array, String valueToRemove) {
-        return null;
+        String[] result =new String[array.length];
+        int len=0;
+        for(int i=0;i<array.length;i++)
+        {
+            if(!valueToRemove.equals(array[i]))
+            {
+                result[len]=array[i];
+                len++;
+
+            }
+
+        }
+        return Arrays.copyOf(result, len);
     }
 
     /**
@@ -92,7 +184,23 @@ public class StringArrayUtils {
      * @return array of Strings with consecutive duplicates removes
      */ // TODO
     public static String[] removeConsecutiveDuplicates(String[] array) {
-        return null;
+        ArrayList <String> result=new ArrayList <String> ();
+        for(int i=1;i<array.length;i++)
+        {
+            if(i+1<array.length && (array[i].equals(array[i+1])))
+            {
+                continue;
+            }
+            else
+                {
+                    result.add(array[i]);
+                }
+        }
+
+        String[] newList= result.toArray(new String[result.size()]);
+
+
+        return newList;
     }
 
     /**
@@ -100,8 +208,47 @@ public class StringArrayUtils {
      * @return array of Strings with each consecutive duplicate occurrence concatenated as a single string in an array of Strings
      */ // TODO
     public static String[] packConsecutiveDuplicates(String[] array) {
-        return null;
+
+        ArrayList<String> s = new ArrayList<String>();
+        StringBuffer tempB= new StringBuffer();
+        boolean flag= false;
+        int i=0;
+        while(i<(array.length)-1){
+            if(array[i].equalsIgnoreCase(array[i+1])){
+                flag=true;
+                tempB.append(array[i]);
+            }
+            else{
+                if (flag==true) {
+                    tempB.append(array[i]);
+                    s.add(tempB.toString());
+                    tempB = new StringBuffer("");
+                }
+                else{
+                    s.add(array[i]);
+                }
+                flag=false;
+
+                }
+                i++;
+            }
+        if (flag==true) {
+            tempB.append(array[i]);
+            s.add(tempB.toString());
+            tempB = new StringBuffer("");
+        }
+        else{
+            s.add(array[i]);
+        }
+
+
+            String[] result= s.toArray(new String[s.size()]);
+        System.out.println(result);
+            return result;
+        }
+
+
     }
 
 
-}
+

src/test/java/com/zipcodewilmington/StringArrayUtilsTest.java

@@ -171,7 +171,7 @@ public class StringArrayUtilsTest {
     public void testContains() {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
         for (String s : array) {
-            boolean outcome = StringArrayUtils.contains(array, s);
+            boolean outcome = StringArrayUtils.contains(array,s);
             Assert.assertTrue(outcome);
         }
     }