Finished String Utilities

PredicateUtilities.java

@@ -10,6 +10,7 @@ public class PredicateUtilities {
     * @return true if `x` is greater than `y`
     */
    public Boolean isGreaterThan(int x, int y) {
+       
        return null;
    }
 

StringUtilities.java

@@ -1,5 +1,4 @@
 
-
 /**
  * Created by dan on 6/14/17.
  */
@@ -8,7 +7,7 @@ public class StringUtilities {
      * @return `Hello World` as a string
      */
     public String getHelloWorld() {
-        return null;
+        return "Hello World";
     }
 
     /**
@@ -17,7 +16,7 @@ public class StringUtilities {
      * @return the concatenation of two strings, `firstSegment`, and `secondSegment`
      */
     public String concatenation(String firstSegment, String secondSegment){
-        return null;
+        return String.join("",firstSegment,secondSegment);
     }
 
     /**
@@ -26,7 +25,8 @@ public class StringUtilities {
      * @return the concatenation of an integer, `firstSegment`, and a String, `secondSegment`
      */
     public String concatenation(int firstSegment, String secondSegment){
-        return null;
+        Integer.toString(firstSegment);
+        return firstSegment + secondSegment;
     }
 
     /**
@@ -34,7 +34,7 @@ public class StringUtilities {
      * @return the first 3 characters of `input`
      */
     public String getPrefix(String input){
-        return null;
+        return input.substring(0,3);
     }
 
     /**
@@ -42,7 +42,7 @@ public class StringUtilities {
      * @return the last 3 characters of `input`
      */
     public String getSuffix(String input){
-        return null;
+        return input.substring(input.length()-3);
     }
 
     /**
@@ -51,7 +51,11 @@ public class StringUtilities {
      * @return the equivalence of two strings, `inputValue` and `comparableValue`
      */
     public Boolean compareTwoStrings(String inputValue, String comparableValue){
-        return null;
+        if (inputValue.equals(comparableValue)) {
+            return true;
+        } else {
+            return false;
+        }
     }
 
     /**
@@ -59,15 +63,16 @@ public class StringUtilities {
      * @return the middle character of `inputValue`
      */
     public Character getMiddleCharacter(String inputValue){
-        return null;
-    }
 
+        return inputValue.charAt(((inputValue.length()-1)/2));
+
+    }
     /**
      * @param spaceDelimitedString a string, representative of a sentence, containing spaces
      * @return the first sequence of characters
      */
     public String getFirstWord(String spaceDelimitedString){
-        return null;
+        return spaceDelimitedString.split(" ")[0];
     }
 
     /**
@@ -75,7 +80,7 @@ public class StringUtilities {
      * @return the second word of a string delimited by spaces.
      */
     public String getSecondWord(String spaceDelimitedString){
-        return null;
+        return spaceDelimitedString.split(" ")[1];
     }
 
     /**
@@ -91,7 +96,7 @@ public class StringUtilities {
      * @return an identical string with spaces removed.
      */
     public String removeWhitespace(String input){
-        return null;
+        return input.replaceAll(" ","");
     }
 
     /**
@@ -99,6 +104,6 @@ public class StringUtilities {
      * @return an identical string with spaces in the front and end removed.
      */
     public String trim(String input){
-        return null;
+        return input.trim();
     }
 }

package.bluej

@@ -2,16 +2,16 @@
 dependency1.from=StringUtilitiesTest
 dependency1.to=StringUtilities
 dependency1.type=UsesDependency
-dependency2.from=PredicateUtilitiesTest
-dependency2.to=PredicateUtilities
+dependency2.from=MathUtilitiesTest
+dependency2.to=MathUtilities
 dependency2.type=UsesDependency
-dependency3.from=MathUtilitiesTest
-dependency3.to=MathUtilities
+dependency3.from=PredicateUtilitiesTest
+dependency3.to=PredicateUtilities
 dependency3.type=UsesDependency
-editor.fx.0.height=0
-editor.fx.0.width=0
-editor.fx.0.x=0
-editor.fx.0.y=0
+editor.fx.0.height=709
+editor.fx.0.width=995
+editor.fx.0.x=240
+editor.fx.0.y=23
 objectbench.height=145
 objectbench.width=776
 package.divider.horizontal=0.6