finished

StringArrayUtils.java

@@ -1,5 +1,4 @@
- 
-
+import java.util.*;
 /**
  * Created by leon on 1/29/18.
  */
@@ -9,7 +8,7 @@ public class StringArrayUtils {
      * @return first element of specified array
      */ // TODO
     public static String getFirstElement(String[] array) {
-    return array[0];
+        return array[0];
     }
 
     /**
@@ -25,7 +24,8 @@ public class StringArrayUtils {
      * @return last element in specified array
      */ // TODO
     public static String getLastElement(String[] array) {
-        return null;
+        String lastStr = array[array.length - 1];
+        return lastStr;
     }
 
     /**
@@ -33,7 +33,8 @@ public class StringArrayUtils {
      * @return second to last element in specified array
      */ // TODO
     public static String getSecondToLastElement(String[] array) {
-        return null;
+        String lastStr = array[array.length - 2];
+        return lastStr;
     }
 
     /**
@@ -42,6 +43,12 @@ public class StringArrayUtils {
      * @return true if the array contains the specified `value`
      */ // TODO
     public static boolean contains(String[] array, String value) {
+        for (int i = 0; i < array.length; i++){
+            if (array[i] == value) {
+                String result = array[i];
+            }
+            return true;
+        }
         return false;
     }
 
@@ -50,7 +57,12 @@ public class StringArrayUtils {
      * @return an array with identical contents in reverse order
      */ // TODO
     public static String[] reverse(String[] array) {
-        return null;
+        for (int i = 0; i < array.length/2; i++){
+            String temp = array[i];
+            array[i] = array[array.length - i - 1];
+            array[array.length - i - 1] = temp;
+        }
+        return array;
     }
 
     /**
@@ -58,7 +70,17 @@ public class StringArrayUtils {
      * @return true if the order of the array is the same backwards and forwards
      */ // TODO
     public static boolean isPalindromic(String[] array) {
-        return false;
+        int i1 = 0;
+        int i2 = array.length - 1;
+        while (i2 > i1) {
+            if (array[i1] != array[i2]) {
+                return false;
+            }
+            ++i1;
+            --i2;
+        }
+        return true;
+
     }
 
     /**
@@ -66,7 +88,21 @@ 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 bool = true;
+        for (char letter = 'a'; letter <= 'z'; letter++){
+            boolean bool2 = false;
+
+            for (int i = 0; i < array.length; i++){
+                if (array[i].toLowerCase().contains(Character.toString(letter))){
+                    bool2 = true;
+                }
+            }
+            if (!bool2) {
+                bool = false;
+            }
+        }
+
+        return bool;
     }
 
     /**
@@ -75,7 +111,14 @@ public class StringArrayUtils {
      * @return number of occurrences the specified `value` has occurred
      */ // TODO
     public static int getNumberOfOccurrences(String[] array, String value) {
-        return 0;
+        int counter = 0;
+        for (String word : array) {
+            if (value.equals(word)){
+                counter++;
+            }
+        }
+
+        return counter;
     }
 
     /**
@@ -84,7 +127,10 @@ public class StringArrayUtils {
      * @return array with identical contents excluding values of `value`
      */ // TODO
     public static String[] removeValue(String[] array, String valueToRemove) {
-        return null;
+        ArrayList<String> strArr = new ArrayList<String> (Arrays.asList(array));
+        strArr.remove(valueToRemove);
+        String[] newArr = strArr.toArray(new String[strArr.size()]);
+        return newArr;
     }
 
     /**
@@ -92,7 +138,27 @@ public class StringArrayUtils {
      * @return array of Strings with consecutive duplicates removes
      */ // TODO
     public static String[] removeConsecutiveDuplicates(String[] array) {
-        return null;
+        int duplicate = 0;
+        int counter = 0;
+
+        for (int i = 0; i < array.length - 1 ; i++){
+            if (array[i].equals(array[i+1])){
+                counter++;
+            }
+        }
+
+        String[] newArr = new String[array.length - counter];
+        String str = null;
+
+        for (int i = 0; i < array.length; i++){
+            if(!array[i].equals(str)){
+                newArr[duplicate] = array[i];
+                str = array[i];
+                duplicate++;
+
+            }
+        } 
+        return newArr;
     }
 
     /**
@@ -100,8 +166,35 @@ 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;
-    }
+        int counter = getCounter(array);
+        String[] result = new String[array.length - counter];
+        String last = array[0];
+        result[0] = array[0];
+        int index = 0;
 
+        for (int i = 1; i < array.length; i++){
+            if (array[i].equals(last)){
+                result[index] += array[i];
+                last = array[i];
+            }
+            else {
+                index++;
+                result[index] = array[i];
+                last = array[i];
+            }
+        }
 
+        return result;
+    }
+
+    public static int getCounter(String[] array){
+        int counter = 0;
+        for(int i = 0; i < array.length - 1; i++){
+            if(array[i].equals(array[i+1])){
+                counter++;
+            }
+        }
+        return counter;
+    }
 }
+

package.bluej

@@ -0,0 +1,42 @@
+#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=283
+editor.fx.0.y=94
+objectbench.height=101
+objectbench.width=461
+package.divider.horizontal=0.6
+package.divider.vertical=0.8007380073800738
+package.editor.height=427
+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