StringArray

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

@@ -1,15 +1,25 @@
 package com.zipcodewilmington;
 
+import com.sun.tools.javac.util.ArrayUtils;
+import java.util.Arrays;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Set;
+
 /**
  * Created by leon on 1/29/18.
  */
 public class StringArrayUtils {
+    private static String[] array;
+
     /**
      * @param array array of String objects
      * @return first element of specified array
      */ // TODO
     public static String getFirstElement(String[] array) {
-        return null;
+
+        return array[0];
     }
 
     /**
@@ -17,7 +27,8 @@ public class StringArrayUtils {
      * @return second element in specified array
      */
     public static String getSecondElement(String[] array) {
-        return null;
+
+        return array[1];
     }
 
     /**
@@ -25,7 +36,8 @@ public class StringArrayUtils {
      * @return last element in specified array
      */ // TODO
     public static String getLastElement(String[] array) {
-        return null;
+
+        return array[array.length - 1];
     }
 
     /**
@@ -33,7 +45,9 @@ public class StringArrayUtils {
      * @return second to last element in specified array
      */ // TODO
     public static String getSecondToLastElement(String[] array) {
-        return null;
+
+        return array[array.length - 2];
+
     }
 
     /**
@@ -42,6 +56,12 @@ public class StringArrayUtils {
      * @return true if the array contains the specified `value`
      */ // TODO
     public static boolean contains(String[] array, String value) {
+
+        for (String s : array) {
+            if (s.equals(value))
+                return true;
+
+        }
         return false;
     }
 
@@ -50,7 +70,15 @@ public class StringArrayUtils {
      * @return an array with identical contents in reverse order
      */ // TODO
     public static String[] reverse(String[] array) {
-        return null;
+
+        String temp = "";
+
+        for (int i = 0; i < array.length / 2; i++) {
+            temp = array[i];
+            array[i] = array[array.length - 1 - i];
+            array[array.length - 1 - i] = temp;
+        }
+        return array;
     }
 
     /**
@@ -58,7 +86,14 @@ 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;
+
+        for (int i = 0; i < array.length; i++) {
+            if (!array[i].equals(array[array.length - 1 - i])) {
+                return false;
+            }
+        }
+
+        return true;
     }
 
     /**
@@ -66,16 +101,50 @@ 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 combo = "";
+
+        for (int i = 0; i < array.length; i++) {
+            String temp = array[i].toLowerCase();
+            String[] tempArray = temp.split(" ");
+            for (int j = 0; j < tempArray.length; j++) {
+                combo += tempArray[j];
+            }
+        }
+        String[] apart = combo.split("");
+
+        String[] counter = new String[26];
+        for (int i = 0; i < apart.length; i++) { //z-z=0 ;  z-a=25 (26-26=0  ; 26-1=25)
+            if (counter['z' - apart[i].charAt(0)] == null) {
+                counter['z' - apart[i].charAt(0)] = apart[i];
+            }
+        }
+        for (int i = 0; i < 26; i++) {
+            if (counter[i] == null) {
+                return false;
+            }
+        }
+        return true;
     }
 
+
     /**
      * @param array array of String objects
      * @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;
+
+        int count = 0;
+
+        for (int i = 0; i < array.length; i++) {
+            if (array[i] == value) {
+                count++;
+            } else {
+            }
+        }
+
+        return count;
     }
 
     /**
@@ -84,7 +153,13 @@ 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;
     }
 
     /**
@@ -92,16 +167,48 @@ public class StringArrayUtils {
      * @return array of Strings with consecutive duplicates removes
      */ // TODO
     public static String[] removeConsecutiveDuplicates(String[] array) {
-        return null;
+
+        ArrayList<String> temp = new ArrayList<String>();
+
+        temp.add(array[0]);
+
+        for (int i = 1; i < array.length; i++) {
+            if (!array[i - 1].equals(array[i])) {
+                temp.add(array[i]);
+            }
+        }
+        String[] newArray = new String[temp.size()];
+        newArray = temp.toArray(new String[temp.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;
-    }
 
+        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[] updatedArray = new String[arrayList.size()];
+        updatedArray = arrayList.toArray(new String[arrayList.size()]);
+        return updatedArray;
+    }
 }
+