arrays StringUtilities

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>6</source>
+                    <target>6</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
     <dependencies>
         <dependency>
             <groupId>junit</groupId>

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

@@ -1,5 +1,7 @@
 package com.zipcodewilmington;
 
+import java.util.*;
+
 /**
  * Created by leon on 1/29/18.
  */
@@ -9,7 +11,9 @@ public class StringArrayUtils {
      * @return first element of specified array
      */ // TODO
     public static String getFirstElement(String[] array) {
-        return null;
+
+
+        return array[0];
     }
 
     /**
@@ -17,7 +21,7 @@ public class StringArrayUtils {
      * @return second element in specified array
      */
     public static String getSecondElement(String[] array) {
-        return null;
+        return array[1];
     }
 
     /**
@@ -25,7 +29,9 @@ public class StringArrayUtils {
      * @return last element in specified array
      */ // TODO
     public static String getLastElement(String[] array) {
-        return null;
+        int lastIndex= array.length-1;
+
+        return array[lastIndex];
     }
 
     /**
@@ -33,7 +39,9 @@ public class StringArrayUtils {
      * @return second to last element in specified array
      */ // TODO
     public static String getSecondToLastElement(String[] array) {
-        return null;
+        int secondtoLast = array.length-2;
+
+        return array[secondtoLast];
     }
 
     /**
@@ -42,7 +50,12 @@ public class StringArrayUtils {
      * @return true if the array contains the specified `value`
      */ // TODO
     public static boolean contains(String[] array, String value) {
-        return false;
+        for(String s : array ){
+            if(s.equals(value)){
+                return true;
+            }
+        }
+            return false;
     }
 
     /**
@@ -50,7 +63,9 @@ public class StringArrayUtils {
      * @return an array with identical contents in reverse order
      */ // TODO
     public static String[] reverse(String[] array) {
-        return null;
+        List<String> list = Arrays.asList(Arrays.copyOf(array, array.length));
+        Collections.reverse(list);
+        return list.toArray(new String[array.length]);
     }
 
     /**
@@ -58,7 +73,8 @@ 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;
+       return Arrays.equals(array, reverse(array));
+
     }
 
     /**
@@ -66,7 +82,20 @@ 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;
+        String arrayString ="";
+        for(String s : array){
+            arrayString+= s;
+        }
+
+        String lower = arrayString.toLowerCase();
+
+
+        for(char i = 'a'; i<'z'; i++){
+            if(!lower.contains(String.valueOf(i))){
+                return false;
+            }
+        }
+        return true;
     }
 
     /**
@@ -75,7 +104,12 @@ public class StringArrayUtils {
      * @return number of occurrences the specified `value` has occurred
      */ // TODO
     public static int getNumberOfOccurrences(String[] array, String value) {
-        return 0;
+        int count = 0;
+        for (int i=0; i<array.length; i++)
+            if (value == array[i])
+                count++;
+        return count;
+
     }
 
     /**
@@ -84,7 +118,10 @@ public class StringArrayUtils {
      * @return array with identical contents excluding values of `value`
      */ // TODO
     public static String[] removeValue(String[] array, String valueToRemove) {
-        return null;
+        List<String> list = new ArrayList<String>(Arrays.asList(array));
+        list.remove(valueToRemove);
+        array = list.toArray(new String[0]);
+        return array;
     }
 
     /**
@@ -92,7 +129,18 @@ public class StringArrayUtils {
      * @return array of Strings with consecutive duplicates removes
      */ // TODO
     public static String[] removeConsecutiveDuplicates(String[] array) {
-        return null;
+        int count = 0;
+        List<String> list = new ArrayList<String>();
+        list.add(array[0]);
+        for(int i = 1; i<array.length; i++){
+            if(array[i] != array[i-1]){
+                list.add(array[i]);
+            }
+        }
+
+        array= list.toArray(new String[0]);
+        return array;
+
     }
 
     /**
@@ -100,7 +148,15 @@ 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;
+        StringBuilder sb = new StringBuilder(array[0]);
+        for(int i = 1; i<array.length; i++){
+            if(array[i]!= array[i-1]){
+                sb.append("-");
+            }
+            sb.append(array[i]);
+        }
+           String[] s = sb.toString().split("-");
+            return s;
     }
 
 

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

@@ -193,7 +193,7 @@ public class StringArrayUtilsTest {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
         String[] expected = {"dog", "lazy", "the", "over", "jumps", "fox", "brown", "quick", "the"};
         String[] actual = StringArrayUtils.reverse(array);
-        Assert.assertEquals(expected, actual);
+        Assert.assertArrayEquals(expected, actual);
     }
 
 
@@ -202,7 +202,7 @@ public class StringArrayUtilsTest {
         String[] array  = {"dog", "lazy", "the", "over", "jumps", "fox", "brown", "quick", "the"};
         String[] expected = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
         String[] actual = StringArrayUtils.reverse(array);
-        Assert.assertEquals(expected, actual);
+        Assert.assertArrayEquals(expected, actual);
     }
 
 
@@ -210,7 +210,7 @@ public class StringArrayUtilsTest {
     public void testReverse3() {
         String[] expected = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
         String[] actual = StringArrayUtils.reverse(StringArrayUtils.reverse(expected));
-        Assert.assertEquals(expected, actual);
+        Assert.assertArrayEquals(expected, actual);
     }
 
 
@@ -337,7 +337,7 @@ public class StringArrayUtilsTest {
         String[] array = {"aba", "aba", "baa", "bab", "bba", "bba", "bba", "bba", "bbb", "bbb"};
         String[] actual = StringArrayUtils.removeConsecutiveDuplicates(array);
         String[] expected = {"aba", "baa", "bab", "bba", "bbb"};
-        Assert.assertEquals(actual, expected);
+        Assert.assertArrayEquals(expected, actual);
     }
 
 
@@ -347,7 +347,7 @@ public class StringArrayUtilsTest {
         String[] array = {"aba", "aba", "baa", "bab", "bba", "zzz", "bba", "bba", "bba", "bbb", "bbb"};
         String[] actual = StringArrayUtils.removeConsecutiveDuplicates(array);
         String[] expected = {"aba", "baa", "bab", "bba", "zzz", "bba", "bbb"};
-        Assert.assertEquals(actual, expected);
+        Assert.assertArrayEquals(expected, actual);
     }
 
 
@@ -356,7 +356,7 @@ public class StringArrayUtilsTest {
         String[] array = {"aba", "aba", "baa", "bab", "bba", "zzz", "bba", "bba", "bba", "aba", "bbb"};
         String[] actual = StringArrayUtils.removeConsecutiveDuplicates(array);
         String[] expected = {"aba", "baa", "bab", "bba", "zzz", "bba", "aba", "bbb"};
-        Assert.assertEquals(actual, expected);
+        Assert.assertArrayEquals(actual, expected);
     }
 
 
@@ -374,7 +374,7 @@ public class StringArrayUtilsTest {
         String[] array = {"a", "a", "a", "b", "c", "c", "a", "a", "d"};
         String[] expected = {"aaa", "b", "cc", "aa", "d"};
         String[] actual = StringArrayUtils.packConsecutiveDuplicates(array);
-        Assert.assertEquals(expected, actual);
+        Assert.assertArrayEquals(expected, actual);
     }
 
 
@@ -383,7 +383,7 @@ public class StringArrayUtilsTest {
         String[] array = {"t", "t", "q", "a", "a", "a", "b", "c", "c", "a", "a", "d", "e", "e", "e"};
         String[] expected = {"tt", "q", "aaa", "b", "cc", "aa", "d", "eee"};
         String[] actual = StringArrayUtils.packConsecutiveDuplicates(array);
-        Assert.assertEquals(expected, actual);
+        Assert.assertArrayEquals(expected, actual);
     }
 
 
@@ -393,7 +393,7 @@ public class StringArrayUtilsTest {
         String[] array = {"m", "o", "o", "n", "m", "a", "n"};
         String[] expected = {"m", "oo", "n", "m", "a", "n"};
         String[] actual = StringArrayUtils.packConsecutiveDuplicates(array);
-        Assert.assertEquals(expected, actual);
+        Assert.assertArrayEquals(expected, actual);
     }
 
 
@@ -408,7 +408,7 @@ public class StringArrayUtilsTest {
         String[] array = {"The", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
         String[] expected = {"quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
         String[] actual = StringArrayUtils.removeValue(array, "The");
-        Assert.assertEquals(expected, actual);
+        Assert.assertArrayEquals(expected, actual);
     }
 
     @Test
@@ -416,7 +416,7 @@ public class StringArrayUtilsTest {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
         String[] expected = {"the", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
         String[] actual = StringArrayUtils.removeValue(array, "quick");
-        Assert.assertEquals(expected, actual);
+        Assert.assertArrayEquals(expected, actual);
     }
 
     @Test
@@ -424,7 +424,7 @@ public class StringArrayUtilsTest {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
         String[] expected = {"the", "quick", "fox", "jumps", "over", "the", "lazy", "dog"};
         String[] actual = StringArrayUtils.removeValue(array, "brown");
-        Assert.assertEquals(expected, actual);
+        Assert.assertArrayEquals(expected, actual);
     }