StringArrayUtils.java

@@ -1,5 +1,5 @@
  
-
+import java.util.*;
 /**
  * Created by leon on 1/29/18.
  */
@@ -9,7 +9,7 @@ public class StringArrayUtils {
      * @return first element of specified array
      */ // TODO
     public static String getFirstElement(String[] array) {
-        return null;
+        return array[0];
     }
 
     /**
@@ -17,7 +17,7 @@ public class StringArrayUtils {
      * @return second element in specified array
      */
     public static String getSecondElement(String[] array) {
-        return null;
+        return array[1];
     }
 
     /**
@@ -25,7 +25,7 @@ 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 +33,7 @@ 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];
     }
 
     /**
@@ -42,7 +42,7 @@ public class StringArrayUtils {
      * @return true if the array contains the specified `value`
      */ // TODO
     public static boolean contains(String[] array, String value) {
-        return false;
+        return Arrays.asList(array).contains(value);
     }
 
     /**
@@ -50,7 +50,12 @@ public class StringArrayUtils {
      * @return an array with identical contents in reverse order
      */ // TODO
     public static String[] reverse(String[] array) {
-        return null;
+        int length = array.length;
+        String[] result = new String[length];
+        for (int i = 0; i < length; i++) {
+            result[i] = array[(length - 1) - i];
+        }
+        return result;   
     }
 
     /**
@@ -58,7 +63,7 @@ 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 +71,19 @@ 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[] alpha = {"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"};
+        String s = "";   
+        int count = 0;
+        for (String e : array) {
+             s += e.replace(" ", "");
+        }
+        String[] check = s.toLowerCase().split("");
+        for (String letter : alpha) {
+            if (contains(check, letter)) count++;
+        }
+        return count == alpha.length;
     }
 
     /**
@@ -75,7 +92,11 @@ 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 (String i : array) {
+            count += (i == value) ? 1 : 0;    
+        }
+        return count;
     }
 
     /**
@@ -84,15 +105,24 @@ 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> result = new ArrayList<>();
+    for (String s : array) {
+        if (!s.equals(valueToRemove)) result.add(s);
+    }    
+    return result.toArray(new String[result.size()]);
     }
 
     /**
      * @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> result = new ArrayList<>();
+        for (int i = 0; i < array.length - 1; i++) {
+            if (!array[i].equals(array[i + 1])) result.add(array[i]); 
+        }
+        result.add(array[array.length - 1]);
+        return result.toArray(new String[result.size()]);
     }
 
     /**
@@ -100,7 +130,21 @@ 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;
+        ArrayList<String> result = new ArrayList<>();
+        StringBuilder addMe = new StringBuilder();
+        for (int i = 0; i < array.length - 1; i++) {          
+            if (!array[i].equals(array[i + 1])) {
+                addMe.append(array[i]);
+                result.add(addMe.toString());
+                addMe = new StringBuilder();
+            }
+            else {
+                addMe.append(array[i]);
+            }
+        }
+        addMe.append(array[array.length - 1]);
+        result.add(addMe.toString());
+        return result.toArray(new String[result.size()]);
     }
 
 

StringArrayUtilsTest.java

@@ -175,6 +175,15 @@ public class StringArrayUtilsTest {
             Assert.assertTrue(outcome);
         }
     }
+    @Test 
+    public void testContainsTwo() {
+       String[] array = {"Five quacking", "zephyrs", "jolt my", "wax bed"};
+       for (String s : array) {
+           boolean outcome = StringArrayUtils.contains(array, s);
+           Assert.assertTrue(outcome);
+       }
+        
+    }
 
 
 

package.bluej

@@ -0,0 +1,42 @@
+#BlueJ package file
+dependency1.from=StringArrayUtilsTest
+dependency1.to=StringArrayUtils
+dependency1.type=UsesDependency
+editor.fx.0.height=712
+editor.fx.0.width=910
+editor.fx.0.x=143
+editor.fx.0.y=59
+objectbench.height=164
+objectbench.width=776
+package.divider.horizontal=0.6
+package.divider.vertical=0.6845018450184502
+package.editor.height=364
+package.editor.width=674
+package.editor.x=112
+package.editor.y=174
+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