MathUtilities.java

@@ -1,4 +1,3 @@
- 
 
 /**
  * Created by dan on 6/14/17.
@@ -11,7 +10,7 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Integer add(int baseValue, int difference) {
-        return null;
+        return baseValue + difference;
     }
 
     /**
@@ -20,7 +19,7 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Long add(long baseValue, long difference) {
-        return null;
+        return baseValue + difference;
     }
 
     /**
@@ -29,7 +28,8 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Short add(short baseValue, short difference) {
-        return null;
+        int x =  baseValue+  difference;
+        return   (short)x;
     }
 
     /**
@@ -38,7 +38,8 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Byte add(byte baseValue, byte difference) {
-        return null;
+        int x = baseValue +difference;
+        return (byte) x;
     }
 
     /**
@@ -47,7 +48,8 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Float add(float baseValue, float difference) {
-        return null;
+
+        return baseValue + difference;
     }
 
     /**
@@ -56,7 +58,7 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Double add(double baseValue, double difference) {
-        return null;
+        return baseValue + difference;
     }
 
     /**
@@ -65,7 +67,7 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Integer subtract(int baseValue, int difference) {
-        return null;
+        return baseValue - difference;
     }
 
     /**
@@ -74,7 +76,9 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Long subtract(long baseValue, long difference) {
-        return null;
+        double x = baseValue - difference;
+        return (long) x;
+
     }
 
     /**
@@ -83,7 +87,9 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Short subtract(short baseValue, short difference) {
-        return null;
+        int x = baseValue -difference;
+        return (short) x;
+
     }
 
     /**
@@ -92,7 +98,8 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Byte subtract(byte baseValue, byte difference) {
-        return null;
+        int x = baseValue -difference;
+        return (byte) x;
     }
 
     /**
@@ -101,7 +108,7 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Float subtract(float baseValue, float difference) {
-        return null;
+        return  baseValue- difference;
     }
 
     /**
@@ -110,17 +117,16 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Double subtract(double baseValue, double difference) {
-        return null;
+        return baseValue - difference;
     }
 
-
     /**
      * @param dividend value to be divided
      * @param divisor value to divide by
      * @return division of `dividend` by `divisor
      */
     public Integer divide(int dividend, int divisor) {
-        return null;
+        return dividend/divisor;
     }
 
     /**
@@ -129,7 +135,7 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Long divide(long dividend, long divisor) {
-        return null;
+        return dividend/divisor;
     }
 
     /**
@@ -138,7 +144,8 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Short divide(short dividend, short divisor) {
-        return null;
+        int x =dividend /divisor;
+        return (short) x;
     }
 
     /**
@@ -147,7 +154,8 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Byte divide(byte dividend, byte divisor) {
-        return null;
+         int x =dividend /divisor;
+        return (byte) x;
     }
 
     /**
@@ -156,7 +164,7 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Float divide(float dividend, float divisor) {
-        return null;
+        return dividend/ divisor;
     }
 
     /**
@@ -165,17 +173,16 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Double divide(double dividend, double divisor) {
-        return null;
+        return dividend/divisor;
     }
 
-
     /**
      * @param multiplicand value to be multiplied
      * @param multiplier value to multiply by
      * @return product of `multiplicand` by `multiplier`
      */
     public Integer multiply(int multiplicand, int multiplier) {
-        return null;
+        return multiplicand*multiplier;
     }
 
     /**
@@ -184,7 +191,8 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Long multiply(long multiplicand, long multiplier) {
-        return null;
+         double x =multiplicand * multiplier;
+        return (long) x;
     }
 
     /**
@@ -193,15 +201,20 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Short multiply(short multiplicand, short multiplier) {
-        return null;
+         int x =multiplicand * multiplier;
+        return (short) x;
+    
     }
+
     /**
      * @param multiplicand value to be multiplied
      * @param multiplier value to multiply by
      * @return product of `multiplicand` by `multiplier`
      */
     public Byte multiply(byte multiplicand, byte multiplier) {
-        return null;
+         int x =multiplicand * multiplier;
+        return (byte) x;
+    
     }
 
     /**
@@ -210,7 +223,7 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Float multiply(float multiplicand, float multiplier) {
-        return null;
+        return multiplicand*multiplier;
     }
 
     /**
@@ -219,22 +232,21 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Double multiply(double multiplicand, double multiplier) {
-        return null;
+        return multiplicand * multiplier ;
     }
 
-
     /**
-      * @return true
+     * @return true
      */
     public Boolean returnTrue() {
-        return null;
+        return true;
     }
 
     /**
      * @return false
      */
     public Boolean returnFalse() {
-        return null;
+        return false;
     }
 
 }

PredicateUtilities.java

@@ -10,7 +10,7 @@ public class PredicateUtilities {
      * @return true if `x` is greater than `y`
      */
     public Boolean isGreaterThan(int x, int y) {
-        return null;
+        return x>y;
     }
 
     /**
@@ -19,7 +19,7 @@ public class PredicateUtilities {
      * @return true if `x` is less than `y`
      */
     public Boolean isLessThan(int x, int y) {
-        return null;
+        return x<y;
     }
 
     /**
@@ -28,7 +28,7 @@ public class PredicateUtilities {
      * @return true if `x` is greater than or equal to `y`
      */
     public Boolean isGreaterThanOrEqualTo(int x, int y) {
-        return null;
+        return x>=y;
     }
 
     /**
@@ -37,6 +37,6 @@ public class PredicateUtilities {
      * @return true if `x` is less than or equal to `y`
      */
     public Boolean isLessThanOrEqualTo(int x, int y) {
-        return null;
+        return x<=y;
     }
 }

StringUtilities.ctxt

@@ -27,7 +27,7 @@ comment7.target=java.lang.Character\ getMiddleCharacter(java.lang.String)
 comment7.text=\n\ @param\ inputValue\ the\ value\ input\ from\ user\n\ @return\ the\ middle\ character\ of\ `inputValue`\n
 comment8.params=spaceDelimitedString
 comment8.target=java.lang.String\ getFirstWord(java.lang.String)
-comment8.text=\n\ @param\ spaceDelimitedString\ a\ string,\ representative\ of\ a\ sentence,\ containing\ spaces\n\ @return\ the\ first\ sequence\ of\ characters\n
+comment8.text=\n\ \ \ \ a\ *\ @param\ spaceDelimitedString\ a\ string,\ representative\ of\ a\ sentence,\ containing\ spaces\n\ @return\ the\ first\ sequence\ of\ characters\n
 comment9.params=spaceDelimitedString
 comment9.target=java.lang.String\ getSecondWord(java.lang.String)
 comment9.text=\n\ @param\ spaceDelimitedString\ a\ string\ delimited\ by\ spaces\n\ @return\ the\ second\ word\ of\ a\ string\ delimited\ by\ spaces.\n

StringUtilities.java

@@ -1,4 +1,3 @@
- 
 
 /**
  * Created by dan on 6/14/17.
@@ -8,7 +7,7 @@ public class StringUtilities {
      * @return `Hello World` as a string
      */
     public static String getHelloWorld() {
-        return null;
+        return "Hello World";
     }
 
     /**
@@ -17,7 +16,7 @@ public class StringUtilities {
      * @return the concatenation of two strings, `firstSegment`, and `secondSegment`
      */
     public static String concatenation(String firstSegment, String secondSegment){
-        return null;
+        return firstSegment + secondSegment;
     }
 
     /**
@@ -26,7 +25,7 @@ public class StringUtilities {
      * @return the concatenation of an integer, `firstSegment`, and a String, `secondSegment`
      */
     public static String concatenation(int firstSegment, String secondSegment){
-        return null;
+        return firstSegment  + secondSegment;
     }
 
     /**
@@ -34,7 +33,7 @@ public class StringUtilities {
      * @return the first 3 characters of `input`
      */
     public static String getPrefix(String input){
-        return null;
+        return input.substring(0,3);
     }
 
     /**
@@ -42,7 +41,8 @@ public class StringUtilities {
      * @return the last 3 characters of `input`
      */
     public static String getSuffix(String input){
-        return null;
+        return input.substring(input.length() - 3);
+       
     }
 
     /**
@@ -51,7 +51,10 @@ public class StringUtilities {
      * @return the equivalence of two strings, `inputValue` and `comparableValue`
      */
     public static Boolean compareTwoStrings(String inputValue, String comparableValue){
-        return null;
+        if (inputValue.equals(comparableValue)){
+                return true;}
+        
+        return false;
     }
 
     /**
@@ -59,15 +62,26 @@ public class StringUtilities {
      * @return the middle character of `inputValue`
      */
     public static Character getMiddleCharacter(String inputValue){
-        return null;
+        int remeinder = 0;
+        int leng = inputValue.length();
+        if ( inputValue.length() % 2 == 0) {
+            remeinder = leng /2 -1;
+             
+        } else { remeinder = leng /2 ; }
+        
+        
+               
+        return inputValue.charAt(remeinder);
+        
     }
 
     /**
-     * @param spaceDelimitedString a string, representative of a sentence, containing spaces
+    a * @param spaceDelimitedString a string, representative of a sentence, containing spaces
      * @return the first sequence of characters
      */
     public static String getFirstWord(String spaceDelimitedString){
-        return null;
+        
+        return spaceDelimitedString.split(" ")[0];
     }
 
     /**
@@ -75,7 +89,8 @@ public class StringUtilities {
      * @return the second word of a string delimited by spaces.
      */
     public static String getSecondWord(String spaceDelimitedString){
-        return null;
+       
+        return spaceDelimitedString.split(" ")[1];
     }
 
     /**
@@ -83,6 +98,11 @@ public class StringUtilities {
      * @return an identical string with characters in reverse order.
      */
     public static String reverse(String stringToReverse){
-        return null;
+        String temp = "";
+        for(int i = stringToReverse.length () - 1; i >=0; i--){
+            temp += stringToReverse.charAt (i); 
+        }
+        
+        return temp ;
     }
 }

package.bluej

@@ -3,13 +3,13 @@ editor.fx.0.height=0
 editor.fx.0.width=0
 editor.fx.0.x=0
 editor.fx.0.y=0
-objectbench.height=129
+objectbench.height=128
 objectbench.width=1171
 package.divider.horizontal=0.6
-package.divider.vertical=0.7490774907749077
-package.editor.height=399
+package.divider.vertical=0.7509225092250923
+package.editor.height=400
 package.editor.width=1069
-package.editor.x=59
+package.editor.x=85
 package.editor.y=63
 package.frame.height=600
 package.frame.width=1195
@@ -37,13 +37,13 @@ target2.type=UnitTestTargetJunit4
 target2.width=140
 target2.x=490
 target2.y=70
-target3.height=50
+target3.height=160
 target3.name=MathUtilities
 target3.showInterface=false
 target3.type=ClassTarget
-target3.width=100
-target3.x=60
-target3.y=150
+target3.width=190
+target3.x=40
+target3.y=200
 target4.height=50
 target4.name=StringUtilities
 target4.showInterface=false