StringArrayUtils

StringArrayUtils.java

@@ -1,4 +1,4 @@
- 
+import java.util.Arrays;
 
 /**
  * Created by leon on 1/29/18.
@@ -9,7 +9,8 @@ public class StringArrayUtils {
      * @return first element of specified array
      */ // TODO
     public static String getFirstElement(String[] array) {
-        return null;
+        return array[0];
+
     }
 
     /**
@@ -17,7 +18,7 @@ public class StringArrayUtils {
      * @return second element in specified array
      */
     public static String getSecondElement(String[] array) {
-        return null;
+        return array[1];
     }
 
     /**
@@ -25,7 +26,7 @@ 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 +34,7 @@ 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 +43,12 @@ public class StringArrayUtils {
      * @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 string : array) {
+            if (string.equalsIgnoreCase(value));
+            answer = true;
+        }
+        return answer;
     }
 
     /**
@@ -50,7 +56,12 @@ public class StringArrayUtils {
      * @return an array with identical contents in reverse order
      */ // TODO
     public static String[] reverse(String[] array) {
-        return null;
+        String[] answer = new String[array.length];
+
+        for (int i = 0; i< array.length; i++)
+            answer[i] = array[array.length-1-i];
+
+        return answer;
     }
 
     /**
@@ -58,7 +69,12 @@ 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;
+        boolean answer = false;
+        for (int i = 0; i < array.length; i++)
+            if (Arrays.equals(array, reverse(array))){
+                answer = true;
+            }
+        return answer;
     }
 
     /**
@@ -66,7 +82,17 @@ 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 isPangramic = false;
+        for (char i = 'A' ; i <= 'Z'; i++)
+            if (Arrays.toString(array).indexOf(i) < 0 && (Arrays.toString(array).indexOf((char) i +32) < 0)) {
+                isPangramic = false;
+                break;
+            } else {
+                isPangramic = true;
+            }
+
+        return isPangramic;
     }
 
     /**
@@ -75,7 +101,13 @@ 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 s: array) {
+            if (value.equals(s)) {
+                count ++;
+            }
+        }
+        return count;     
     }
 
     /**
@@ -84,7 +116,16 @@ public class StringArrayUtils {
      * @return array with identical contents excluding values of `value`
      */ // TODO
     public static String[] removeValue(String[] array, String valueToRemove) {
-        return null;
+        int index = 0;
+        int count = getNumberOfOccurrences(array, valueToRemove);
+        String[] newArray = new String[array.length-count];       
+        for (int i = 0; i < array.length; i++) {
+            if (array[i] != valueToRemove) {
+                newArray[index] = array[i];
+                index++;
+            }        
+        }    
+        return newArray;
     }
 
     /**
@@ -92,6 +133,7 @@ public class StringArrayUtils {
      * @return array of Strings with consecutive duplicates removes
      */ // TODO
     public static String[] removeConsecutiveDuplicates(String[] array) {
+
         return null;
     }
 
@@ -103,5 +145,4 @@ public class StringArrayUtils {
         return null;
     }
 
-
 }

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=686
+editor.fx.0.y=23
+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=387
+package.editor.y=81
+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=ClassTarget
+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