tried my best to complete

LoopFun.java

@@ -8,7 +8,12 @@ public class LoopFun
        * @return the factorial of the number
        */
       public int factorial(int number){
-          return -1;
+          int total = 0;
+          for (int i=1;i<=number;i++) {
+              total = total * i;
+              i++;
+            }
+          return total;
       }
 
       /**
@@ -19,7 +24,13 @@ public class LoopFun
        * @return Upper case string of the first letter of each word
        */
       public String acronym(String phrase) {
-          return null;
+        StringBuilder newStr = new StringBuilder();
+        String[] array = phrase.split(" ");
+            for (int i=0;i<array.length;i++){
+                phrase = array[i].substring(0, 1).toUpperCase();
+                newStr.append(phrase);
+            }
+        return newStr.toString();
       }
 
       /**
@@ -34,7 +45,23 @@ public class LoopFun
        * @param word
        * @return the encrypted string by shifting each character by three character
        */
+      
+      
       public String encrypt(String word) {
-          return null;
-      }
+          String encrypted = "";
+          for (int i = 0; i < word.length(); i++) {
+          if (((char)(word.charAt(i) + 3)  > 'Z' &&
+                         word.charAt(i) <= 'Z') 
+                    || ((char)(word.charAt(i) + 3)  > 'z' 
+                        && word.charAt(i) <= 'z')){
+                            encrypted = encrypted + (char)(word.charAt(i) + 3 - 26);	
+				}
+				else 
+				{encrypted = encrypted + (char)(word.charAt(i) + 3);
+				}
+				encrypted = encrypted + word.charAt(i);
 }
+			                
+            return encrypted;                  
+      }
+    }

MathUtilities.java

@@ -6,7 +6,7 @@ public class MathUtilities{
    * @return the sum of the two numbers
    */
   public int add(int num1, int num2){
-      return -1;
+      return num1 + num2;
   }
 
   /**
@@ -16,7 +16,7 @@ public class MathUtilities{
    * @return the sum of the two numbers
    */
   public double add(double num1, double num2){
-      return -1;
+      return num1 + num2;
   }
 
   /**
@@ -25,7 +25,7 @@ public class MathUtilities{
    * @return the half of the number in double
    */
   public double half(int number) {
-      return -1;
+      return number/2;
   }
 
   /**
@@ -34,7 +34,11 @@ public class MathUtilities{
    * @return true if the number is odd, false if it is even
    */
   public boolean isOdd(int number){
-      return false;
+      
+      if (number%2 == 1){
+          return true;
+        }
+      return false;  
   }
 
 
@@ -44,7 +48,7 @@ public class MathUtilities{
    * @return the result of the number multiply by itself
    */
   public int square(int number) {
-      return -1;
+      return number*number;
   }
 
 }

StringUtilities.java

@@ -1,13 +1,30 @@
 public class StringUtilities {
    public Character getMiddleCharacter(String word){
-       return null;
+       char wordResult = 'a';
+
+       if (word.length()%2 == 1) {
+           int oddLength = word.length()/2;
+           int evenLength = word.length()/2-1;
+//           wordResult = word.substring(oddLength, oddLength + 1);
+        }
+        else {
+ //           wordResult = word.substring(evenLength, evenlength + 1);
+        }
+       return wordResult;
    }
-   
+ 
+
    public String removeCharacter(String value, char charToRemove){
-     return null;  
+       String newString = "";
+ 
+       for (int i = 0; i < value.length(); i ++) {
+           if (value.charAt(i) != charToRemove) newString += value.charAt(i);
+        }
+ 
+    return newString;  
    }
    
    public String getLastWord(String value) {
-       return null;
+       return value.substring(value.lastIndexOf(" ")+1);
    }
 }

package.bluej

@@ -2,24 +2,24 @@
 dependency1.from=StringUtilitiesTest
 dependency1.to=StringUtilities
 dependency1.type=UsesDependency
-dependency2.from=BonusTest
-dependency2.to=Bonus
+dependency2.from=LoopFunTest
+dependency2.to=LoopFun
 dependency2.type=UsesDependency
 dependency3.from=MathUtilitiesTest
 dependency3.to=MathUtilities
 dependency3.type=UsesDependency
-editor.fx.0.height=722
-editor.fx.0.width=876
-editor.fx.0.x=158
-editor.fx.0.y=216
+editor.fx.0.height=567
+editor.fx.0.width=1172
+editor.fx.0.x=288
+editor.fx.0.y=98
 objectbench.height=164
 objectbench.width=669
 package.divider.horizontal=0.6
 package.divider.vertical=0.7628294036061026
 package.editor.height=543
 package.editor.width=567
-package.editor.x=557
-package.editor.y=43
+package.editor.x=23
+package.editor.y=23
 package.frame.height=779
 package.frame.width=693
 package.numDependencies=3
@@ -40,20 +40,19 @@ target1.width=110
 target1.x=110
 target1.y=150
 target2.height=50
-target2.name=BonusTest
+target2.name=LoopFunTest
 target2.showInterface=false
 target2.type=UnitTestTargetJunit4
-target2.width=80
-target2.x=120
-target2.y=270
-target3.association=BonusTest
+target2.width=110
+target2.x=10
+target2.y=240
 target3.height=50
-target3.name=Bonus
+target3.name=LoopFun
 target3.showInterface=false
 target3.type=ClassTarget
 target3.width=80
-target3.x=90
-target3.y=300
+target3.x=200
+target3.y=210
 target4.association=MathUtilitiesTest
 target4.height=50
 target4.name=MathUtilities