StrinArrayUtilities

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

@@ -1,39 +1,50 @@
 package com.zipcodewilmington;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
 
 /**
  * Created by leon on 1/29/18.
  */
-public class StringArrayUtils {
+public class StringArrayUtils
+{
     /**
      * @param array array of String objects
      * @return first element of specified array
      */ // TODO
-    public static String getFirstElement(String[] array) {
-        return null;
+    public static String getFirstElement(String[] array)
+
+    {
+        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];
     }
 
     /**
@@ -41,7 +52,15 @@ public class StringArrayUtils {
      * @param value value to check array for
      * @return true if the array contains the specified `value`
      */ // TODO
-    public static boolean contains(String[] array, String value) {
+    public static boolean contains(String[] array, String value)
+    {
+        for(String str : array)
+        {
+            if(value.equals(str))
+            {
+                return true;
+            }
+        }
         return false;
     }
 
@@ -49,8 +68,17 @@ public class StringArrayUtils {
      * @param array of String objects
      * @return an array with identical contents in reverse order
      */ // TODO
-    public static String[] reverse(String[] array) {
-        return null;
+
+    public static String[] reverse(String[] array)
+    {
+        String[] str = new String[array.length];
+        int count=(array.length)-1;
+        for(String s : array)
+        {
+            str[count]=s;
+              count--;
+        }
+        return  str;
     }
 
     /**
@@ -58,6 +86,17 @@ public class StringArrayUtils {
      * @return true if the order of the array is the same backwards and forwards
      */ // TODO
     public static boolean isPalindromic(String[] array) {
+        String[] str = new String[array.length];
+        int count = (array.length) - 1;
+        for (String s : array) {
+            str[count] = s;
+            count--;
+            for (int i = 0, j = 0; i < array.length; i++, j++) {
+                if (array[i].equals(str[j]))
+                    return true;
+            }
+
+        }
         return false;
     }
 
@@ -65,8 +104,19 @@ public class StringArrayUtils {
      * @param array array of String objects
      * @return true if each letter in the alphabet has been used in the array
      */ // TODO
-    public static boolean isPangramic(String[] array) {
-        return false;
+    public static boolean isPangramic(String[] array)
+    {
+        boolean isAPanGramic = true;
+        String strLower = "";
+        for (String var : array) {
+            strLower = strLower.concat(var.toLowerCase());
+        }
+        for(int i = 97; i <= 122; i++){
+            if(!strLower.contains(Character.toString((char)i))){
+                isAPanGramic = false;
+            }
+        }
+        return isAPanGramic;
     }
 
     /**
@@ -74,8 +124,15 @@ 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 (String str: array){
+            if(value.equals(str) )
+                count++;
+        }
+        return count;
     }
 
     /**
@@ -83,24 +140,56 @@ public class StringArrayUtils {
      * @param valueToRemove value to remove from array
      * @return array with identical contents excluding values of `value`
      */ // TODO
-    public static String[] removeValue(String[] array, String valueToRemove) {
-        return null;
+    public static String[] removeValue(String[] array, String valueToRemove)
+    {
+        List<String> list = new ArrayList<String>(Arrays.asList(array));
+        list.remove(valueToRemove);
+        array = list.toArray(new String[0]);
+        return array;
     }
 
     /**
      * @param array array of chars
      * @return array of Strings with consecutive duplicates removes
      */ // TODO
-    public static String[] removeConsecutiveDuplicates(String[] array) {
-        return null;
+    public static String[] removeConsecutiveDuplicates(String[] array)
+    {
+
+        ArrayList<String> remove = new ArrayList<String>();
+        remove.add(array[0]);
+        for (int i = 1; i < array.length; i++) {
+            if (!array[i - 1].equals(array[i])) {
+                remove.add(array[i]);
+            }
+        }
+        String[] newArray = new String[remove.size()];
+        newArray = remove.toArray(new String[remove.size()]);
+
+        return newArray;
     }
 
     /**
      * @param array array of chars
      * @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;
+    public static String[] packConsecutiveDuplicates(String[] array)
+    {
+
+        ArrayList<String> arrayList = new ArrayList<String>();
+        String str = new String();
+        str = array[0];
+        arrayList.add(array[0]);
+        for (int i = 1; i < array.length; i++) {
+            if (array[i] == str) {
+                arrayList.set(arrayList.size() - 1, arrayList.get(arrayList.size() - 1) + array[i]);
+            } else {
+                arrayList.add(array[i]);
+                str = array[i];
+            }
+        }
+        String[] newArray = new String[arrayList.size()];
+        newArray = arrayList.toArray(new String[arrayList.size()]);
+        return newArray;
     }
 
 

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

@@ -33,19 +33,6 @@ public class StringArrayUtilsTest {
         Assert.assertEquals(expected, actual);
     }
 
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     @Test
     public void testGetSecondElement1() {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
@@ -61,8 +48,6 @@ public class StringArrayUtilsTest {
         String actual = StringArrayUtils.getSecondElement(array);
         Assert.assertEquals(expected, actual);
     }
-
-
     @Test
     public void testGetSecondElement3() {
         String[] array = {"brown", "fox", "jumps", "over", "the", "lazy", "dog"};
@@ -70,17 +55,6 @@ public class StringArrayUtilsTest {
         String actual = StringArrayUtils.getSecondElement(array);
         Assert.assertEquals(expected, actual);
     }
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     @Test
     public void testGetLastElement1() {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
@@ -88,7 +62,6 @@ public class StringArrayUtilsTest {
         String actual = StringArrayUtils.getLastElement(array);
         Assert.assertEquals(expected, actual);
     }
-
     @Test
     public void testGetLastElement2() {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy"};
@@ -96,8 +69,6 @@ public class StringArrayUtilsTest {
         String actual = StringArrayUtils.getLastElement(array);
         Assert.assertEquals(expected, actual);
     }
-
-
     @Test
     public void testGetLastElement3() {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over"};
@@ -105,27 +76,6 @@ public class StringArrayUtilsTest {
         String actual = StringArrayUtils.getLastElement(array);
         Assert.assertEquals(expected, actual);
     }
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     @Test
     public void testGetSecondToLastElement1() {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
@@ -133,7 +83,6 @@ public class StringArrayUtilsTest {
         String actual = StringArrayUtils.getSecondToLastElement(array);
         Assert.assertEquals(expected, actual);
     }
-
     @Test
     public void testGetSecondToLastElement2() {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "lazy"};
@@ -141,8 +90,6 @@ public class StringArrayUtilsTest {
         String actual = StringArrayUtils.getSecondToLastElement(array);
         Assert.assertEquals(expected, actual);
     }
-
-
     @Test
     public void testGetSecondToLastElement3() {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over"};
@@ -150,23 +97,6 @@ public class StringArrayUtilsTest {
         String actual = StringArrayUtils.getSecondToLastElement(array);
         Assert.assertEquals(expected, actual);
     }
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     @Test
     public void testContains() {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
@@ -175,19 +105,6 @@ public class StringArrayUtilsTest {
             Assert.assertTrue(outcome);
         }
     }
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     @Test
     public void testReverse1() {
         String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
@@ -195,8 +112,6 @@ public class StringArrayUtilsTest {
         String[] actual = StringArrayUtils.reverse(array);
         Assert.assertEquals(expected, actual);
     }
-
-
     @Test
     public void testReverse2() {
         String[] array  = {"dog", "lazy", "the", "over", "jumps", "fox", "brown", "quick", "the"};
@@ -204,97 +119,54 @@ public class StringArrayUtilsTest {
         String[] actual = StringArrayUtils.reverse(array);
         Assert.assertEquals(expected, actual);
     }
-
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     @Test
     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);
     }
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     @Test
     public void testIsPalindromic1() {
         String[] array = {"a", "b", "c", "b", "a"};
         boolean outcome = StringArrayUtils.isPalindromic(array);
         Assert.assertTrue(outcome);
     }
-
-
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     @Test
     public void testIsPalindromic2() {
         String[] array = {"Is this a palindrome?", "This is a palindrome", "Is this a palindrome?"};
         boolean outcome = StringArrayUtils.isPalindromic(array);
         Assert.assertTrue(outcome);
     }
-
-
     @Test
     public void testIsPalindromic3() {
         String[] array = {"Is this a plaindrome?", "This is not a plaindrome", "Is this a palindrome?", "This is not a palindrome"};
         boolean outcome = StringArrayUtils.isPalindromic(array);
         Assert.assertFalse(outcome);
     }
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     @Test
     public void testIsPangramic1() {
         String[] array = {"The quick brown", "Fox jumps over", "The lazy dog"};
         boolean outcome = StringArrayUtils.isPangramic(array);
         Assert.assertTrue(outcome);
     }
-
     @Test
     public void testIsPangramic2() {
         String[] array = {"The", "quick", "onyx", "goblin", "jumps", "over", "the", "lazy", "dwarf"};
         boolean outcome = StringArrayUtils.isPangramic(array);
         Assert.assertTrue(outcome);
     }
-
     @Test
     public void testIsPangramic3() {
         String[] array = {"Five quacking", "zephyrs", "jolt my", "wax bed"};
         boolean outcome = StringArrayUtils.isPangramic(array);
         Assert.assertTrue(outcome);
     }
-
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     @Test
     public void testIsPangramic4() {
         String[] array = {"a", "b", "c", "d"};
         boolean outcome = StringArrayUtils.isPangramic(array);
         Assert.assertFalse(outcome);
     }
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     @Test
     public void testGetNumberOfOccurrences1() {
         String[] array = {"aba", "aba", "baa", "bab", "bba", "bba", "bba", "bba", "bbb", "bbb"};
@@ -302,7 +174,6 @@ public class StringArrayUtilsTest {
         int actual = StringArrayUtils.getNumberOfOccurrences(array, "bba");
         Assert.assertEquals(actual, expected);
     }
-
     @Test
     public void testGetNumberOfOccurrences2() {
         String[] array = {"aba", "aba", "baa", "bab", "bba", "bba", "bba", "bba", "bbb", "bbb"};
@@ -310,7 +181,6 @@ public class StringArrayUtilsTest {
         int actual = StringArrayUtils.getNumberOfOccurrences(array, "bbb");
         Assert.assertEquals(actual, expected);
     }
-
     @Test
     public void testGetNumberOfOccurrences3() {
         String[] array = {"aba", "aba", "baa", "bab", "bba", "bba", "bba", "bba", "bbb", "bbb"};
@@ -318,20 +188,6 @@ public class StringArrayUtilsTest {
         int actual = StringArrayUtils.getNumberOfOccurrences(array, "bba");
         Assert.assertEquals(actual, expected);
     }
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     @Test
     public void testRemoveConsecutiveDuplicates1() {
         String[] array = {"aba", "aba", "baa", "bab", "bba", "bba", "bba", "bba", "bbb", "bbb"};
@@ -339,9 +195,6 @@ public class StringArrayUtilsTest {
         String[] expected = {"aba", "baa", "bab", "bba", "bbb"};
         Assert.assertEquals(actual, expected);
     }
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     @Test
     public void testRemoveConsecutiveDuplicates2() {
         String[] array = {"aba", "aba", "baa", "bab", "bba", "zzz", "bba", "bba", "bba", "bbb", "bbb"};