arrays

StringArrayUtils.java

@@ -3,13 +3,18 @@
 /**
  * Created by leon on 1/29/18.
  */
+
+import java.util.Collections;
+
 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 firstElement = array[0];
+        
+        return firstElement;
     }
 
     /**
@@ -17,7 +22,9 @@ public class StringArrayUtils {
      * @return second element in specified array
      */
     public static String getSecondElement(String[] array) {
-        return null;
+        String secondElement = array[1];
+        
+        return secondElement;
     }
 
     /**
@@ -25,7 +32,9 @@ public class StringArrayUtils {
      * @return last element in specified array
      */ // TODO
     public static String getLastElement(String[] array) {
-        return null;
+        String lastElement = array[array.length-1];
+        
+        return lastElement;
     }
 
     /**
@@ -33,7 +42,8 @@ public class StringArrayUtils {
      * @return second to last element in specified array
      */ // TODO
     public static String getSecondToLastElement(String[] array) {
-        return null;
+        String secondToLast = array[array.length-2];
+        return secondToLast;
     }
 
     /**
@@ -42,7 +52,14 @@ public class StringArrayUtils {
      * @return true if the array contains the specified `value`
      */ // TODO
     public static boolean contains(String[] array, String value) {
-        return false;
+        boolean contains = false;
+        
+        for (int i = 0; i < array.length; i++) {
+            if (array[i].equalsIgnoreCase(value)) {
+                contains = true;
+        }
+    }
+        return contains;
     }
 
     /**
@@ -50,7 +67,15 @@ public class StringArrayUtils {
      * @return an array with identical contents in reverse order
      */ // TODO
     public static String[] reverse(String[] array) {
-        return null;
+        
+        String temp;
+        for (int i = 0; i <= array.length/2; i++) {
+            temp = array[i];
+            array[i] = array[array.length -1 -i];
+            array[array.length -1 -i] = temp;
+            
+        }
+        return array;
     }
 
     /**
@@ -58,7 +83,15 @@ 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 palindrome = false;
+        for (int i = 0; i <= array.length/2; i++) {
+            if (array[i] == array[array.length -1 -i]) {
+                palindrome = true;
+        }
+        
+        
+        }
+        return palindrome;
     }
 
     /**
@@ -66,7 +99,25 @@ 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 pangram = false;
+        
+        StringBuilder build = new StringBuilder();
+        
+        for (String s : array){
+            build.append(s);
+        }
+        
+        String ofArr = "";
+        ofArr = build.toString();
+            for (char a = 'A'; a <= 'Z'; a++) {
+                if ((ofArr.indexOf(a) < 0) && (ofArr.indexOf((char)(a + 32)) < 0)) {
+                    pangram = false;
+            } else {
+                    pangram = true;
+                    
+            }
+        }
+        return pangram;
     }
 
     /**
@@ -75,7 +126,16 @@ 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 (int i = 0; i < array.length; i++) {
+            if (array[i] == value) {
+                count++;
+            }
+        }
+        
+        
+        return count;
     }
 
     /**
@@ -84,7 +144,20 @@ 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 [] newArr = new String [array.length - count] ;
+        
+        for (int i = 0; i < array.length; i++) {
+           if (array[i] != valueToRemove) {
+               
+               newArr[index] = array[i];
+               index++;
+            }
+        }
+        return newArr;
+        
+        
     }
 
     /**
@@ -92,7 +165,30 @@ public class StringArrayUtils {
      * @return array of Strings with consecutive duplicates removes
      */ // TODO
     public static String[] removeConsecutiveDuplicates(String[] array) {
-        return null;
+        String last = null;
+        int index = 0;
+        int count = 0; 
+        
+        
+        for (int i = 0; i < array.length - 1; i++) {
+            if (array[i].equals(array[i + 1])) {
+                count++;
+            }
+        }
+        
+        String [] newArr = new String [array.length - count];
+        
+        for (int i = 0; i < array.length; i++) {
+            
+            
+            if (!array[i].equals(last)){
+                newArr[index] = array[i];
+                last = array[i];
+                index++;
+            }
+        }
+        
+        return newArr;
     }
 
     /**
@@ -100,8 +196,37 @@ 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 getCounting = getCount(array);
+        String [] savedArr = new String [array.length - getCounting];
+        String last = array[0];
+        savedArr[0] = array[0];
+        int index = 0;
+        
+        for (int i = 1; i < array.length; i++) {
+            if (array[i].equals(last)) {
+                savedArr[index] += array[i];
+            }
+            else {
+                index++;
+                savedArr[index] = array[i];
+                last = array[i];
+        }
+        
+    }
+        
+        return savedArr;
+    
     }
 
-
+    private static int getCount (String[] array){
+        int count = 0; 
+        
+        
+        for (int i = 0; i < array.length - 1; i++) {
+            if (array[i].equals(array[i + 1])) {
+                count++;
+            }
+        }
+        return count;
+    }
 }

package.bluej

@@ -0,0 +1,42 @@
+#BlueJ package file
+dependency1.from=StringArrayUtilsTest
+dependency1.to=StringArrayUtils
+dependency1.type=UsesDependency
+editor.fx.0.height=794
+editor.fx.0.width=925
+editor.fx.0.x=451
+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=459
+package.editor.y=226
+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=240
+target1.y=20
+target2.height=50
+target2.name=StringArrayUtils
+target2.showInterface=false
+target2.type=ClassTarget
+target2.width=120
+target2.x=70
+target2.y=70