StringArrayUtils.java

- 
 
 /**
  * Created by leon on 1/29/18.
  */
+
+import java.util.Arrays;
 public class StringArrayUtils {
     /**
      * @param array array of String objects
      * @return first element of specified array
      */ // TODO
     public static String getFirstElement(String[] array) {
-        return null;
+        String result = "";
+        for(int i = 0; i < array.length; i++) {
+            result += array[0]; 
+            break;
+        }
+        return result;
     }
 
     /**
      * @return second element in specified array
      */
     public static String getSecondElement(String[] array) {
-        return null;
+        String result = "";
+        for(int i = 0; i < array.length; i++) {
+            result += array[1];
+            break;
+        }
+        return result;
     }
 
     /**
      * @return last element in specified array
      */ // TODO
     public static String getLastElement(String[] array) {
-        return null;
-    }
+        return array[array.length -1];
+    }        
 
     /**
      * @param array array of String objects
      * @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 hasString = false;
+        for(String s : array) {
+            if(s.equals(value)) {
+                hasString = true;
+                break;
+            }
+        }
+        return hasString;
     }
 
     /**
      * @return an array with identical contents in reverse order
      */ // TODO
     public static String[] reverse(String[] array) {
-        return null;
+        String[] ns = new String[array.length];
+        for(int i = 0; i < array.length; i++){
+            ns[array.length -1 -i] = array[i];
+        }
+        return ns;
     }
 
     /**
      * @return true if the order of the array is the same backwards and forwards
      */ // TODO
     public static boolean isPalindromic(String[] array) {
-        return false;
+        boolean ispalindromin = false;
+        for(int i = 0; i < array.length / 2; i++) {
+            if(array[i] == array[array.length -i -1]) {
+                ispalindromin = true;
+            }
+        }
+        return ispalindromin;
+
     }
 
     /**
      * @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;
     }
 
     /**
      * @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(s.equals(value)){
+                count +=1;
+            }
+        }
+        return count;
     }
 
     /**
      * @return array with identical contents excluding values of `value`
      */ // TODO
     public static String[] removeValue(String[] array, String valueToRemove) {
-        return null;
+        int count = 0;
+        int occurences = getNumberOfOccurrences(array, valueToRemove);
+        String[] str = new String[array.length - occurences];
+        for(String element : array) {
+            if(element != valueToRemove) {
+                str[count] = element;
+                count++;
+            }
+        }
+        return str;
     }
 
     /**
      * @return array of Strings with consecutive duplicates removes
      */ // TODO
     public static String[] removeConsecutiveDuplicates(String[] array) {
-        return null;
+        int dupCount = 0;
+        
+        for(int i = 0; i < array.length -1; i++) {
+            if(array[i].equals(array[i+1])) {
+                dupCount = dupCount + 1;
+            }
+        }
+        
+        String[] str = new String[array.length - dupCount];
+        
+        int j = 0;
+        for(int i = 0; i < array.length -1; i++) {
+            if(!array[i].equals(array[i + 1])) {
+                str[j++] = (array[i]);
+            }
+        }
+        str[str.length -1] = array[array.length -1];
+        return str;
     }
 
     /**
      * @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 dupCount = 0;
+       
+        for(int i = 0; i < array.length-1; i++){
+            if(array[i].equals(array[i+1])){
+                dupCount = dupCount + 1;
+            }
+        }
+        
+        String[] str = new String[array.length - dupCount];
+        
+        int j = 0;
+        for(int i = 0; i < array.length-1; i++){
+            if(array[i].equals(array[i+1])){
+                StringBuilder sb = new StringBuilder(array[i]);
+                sb.append(array[i+1]);
+                
+                str[j++] = (array[i]);
+            }
+        }
+ 
+        return str;
     }
-
-
 }
+

package.bluej

+#BlueJ package file
+dependency1.from=StringArrayUtilsTest
+dependency1.to=StringArrayUtils
+dependency1.type=UsesDependency
+editor.fx.0.height=717
+editor.fx.0.width=645
+editor.fx.0.x=635
+editor.fx.0.y=23
+objectbench.height=101
+objectbench.width=636
+package.divider.horizontal=0.6
+package.divider.vertical=0.8361153262518968
+package.editor.height=544
+package.editor.width=534
+package.editor.x=183
+package.editor.y=23
+package.frame.height=717
+package.frame.width=660
+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=160
+target1.x=130
+target1.y=10
+target2.height=50
+target2.name=StringArrayUtils
+target2.showInterface=false
+target2.type=ClassTarget
+target2.width=130
+target2.x=70
+target2.y=70