StringArrayUtils.java

- 
+import java.util.Arrays;
 
-/**
- * Created by leon on 1/29/18.
- */
 public class StringArrayUtils {
     /**
      * @param array array of String objects
      * @return first element of specified array
      */ // TODO
     public static String getFirstElement(String[] array) {
-        return null;
+        return array[0];
     }
 
     /**
      * @return second element in specified array
      */
     public static String getSecondElement(String[] array) {
-        return null;
+        return array[1];
     }
 
     /**
      * @return last element in specified array
      */ // TODO
     public static String getLastElement(String[] array) {
-        return null;
+        return array[array.length-1];
     }
 
     /**
      * @return second to last element in specified array
      */ // TODO
     public static String getSecondToLastElement(String[] array) {
-        return null;
+        return array[array.length-2];
     }
 
     /**
      * @return true if the array contains the specified `value`
      */ // TODO
     public static boolean contains(String[] array, String value) {
-        return false;
+        boolean answer = false;
+        for (String x: array){
+            if (x.equals(value))
+                answer = true;
+        }
+        return answer;
     }
 
     /**
      * @return an array with identical contents in reverse order
      */ // TODO
     public static String[] reverse(String[] array) {
-        return null;
+        String [] str = new String [array.length];
+        int count = 0;
+        for (int i = array.length-1; i>=0; i--){
+            str[count] = array[i];
+            count=count+1;
+        }
+        return str;
     }
 
     /**
      * @return true if the order of the array is the same backwards and forwards
      */ // TODO
     public static boolean isPalindromic(String[] array) {
-        return false;
+        String [] newArray = reverse(array);
+        if (Arrays.equals(newArray, array)) 
+            return true;
+        else
+            return false;
     }
 
     /**
      * @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 flag = false;
+        String [] alphabet = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"};
+
+        StringBuilder sb = new StringBuilder();
+        for (String element: array)
+            sb.append(element);
+        String str = sb.toString();
+
+        for (String letter : alphabet){
+            if (str.contains(letter))
+                flag = true;           
+            else
+                flag = false;
+        }
+        return flag;
+
     }
 
     /**
      * @return number of occurrences the specified `value` has occurred
      */ // TODO
     public static int getNumberOfOccurrences(String[] array, String value) {
-        return 0;
+        int numberOfOccurences = 0;
+        for (int i = 0; i <=array.length-1; i++){
+            if (array[i]==value)
+                numberOfOccurences+=1;  
+        }
+        return numberOfOccurences;             
     }
 
     /**
      * @return array with identical contents excluding values of `value`
      */ // TODO
     public static String[] removeValue(String[] array, String valueToRemove) {
-        return null;
+        String [] strWithoutValue = new String [array.length-1];
+        int count = 0;
+        for (int i = 0; i < array.length; i++){
+            if (!array[i].equals(valueToRemove)){
+                strWithoutValue[count]=array[i];
+                count += 1;
+            }
+        }
+        return strWithoutValue;         
     }
 
     /**
      * @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) {        
+        String [] newArray = new String[array.length];
+
+        int positionOfNewArray = 0;
+
+        for (int i = 0; i <= array.length-2; i++){
+            if (!array[i].equals(array[i+1])){
+                newArray[positionOfNewArray] = array[i];
+                positionOfNewArray+=1;
+            }
+        }
+
+        newArray[positionOfNewArray] = array[array.length-1];
+
+        String [] finalArray = new String [positionOfNewArray+1];
+
+        for (int i = 0; i< positionOfNewArray+1; i++){
+            finalArray[i] = newArray[i];
+        }
+        return finalArray;
     }
 
     /**
      * @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();
+
+        for (int i = 0; i < array.length-1; i++){
+            if (array[i].equals(array[i+1]))
+                sb.append(array[i]);
+            else {
+                sb.append(array[i]);
+                sb.append(" ");
+            }
+        }
+        sb.append(array[array.length-1]);
 
-}
+        String str = sb.toString();
+        String [] newArray = str.split(" ");
+        return newArray;
+    }
+}

package.bluej

+#BlueJ package file
+dependency1.from=StringArrayUtilsTest
+dependency1.to=StringArrayUtils
+dependency1.type=UsesDependency
+editor.fx.0.height=722
+editor.fx.0.width=800
+editor.fx.0.x=320
+editor.fx.0.y=51
+objectbench.height=102
+objectbench.width=461
+package.divider.horizontal=0.6
+package.divider.vertical=0.7988929889298892
+package.editor.height=426
+package.editor.width=674
+package.editor.x=0
+package.editor.y=23
+package.frame.height=600
+package.frame.width=800
+package.numDependencies=1
+package.numTargets=2
+package.showExtends=true
+package.showUses=true
+project.charset=UTF-8
+readme.height=58
+readme.name=@README
+readme.width=47
+readme.x=10
+readme.y=10
+target1.height=50
+target1.name=StringArrayUtilsTest
+target1.showInterface=false
+target1.type=UnitTestTargetJunit4
+target1.width=150
+target1.x=130
+target1.y=10
+target2.height=50
+target2.name=StringArrayUtils
+target2.showInterface=false
+target2.type=ClassTarget
+target2.width=120
+target2.x=70
+target2.y=70