Finished Drills

MathUtilities.java

@@ -11,7 +11,7 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Integer add(int baseValue, int difference) {
-        return null;
+        return baseValue + difference;
     }
 
     /**
@@ -20,7 +20,7 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Long add(long baseValue, long difference) {
-        return null;
+        return baseValue + difference;
     }
 
     /**
@@ -29,7 +29,7 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Short add(short baseValue, short difference) {
-        return null;
+        return (short) (baseValue + difference);
     }
 
     /**
@@ -38,7 +38,7 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Byte add(byte baseValue, byte difference) {
-        return null;
+        return (byte) (baseValue + difference);
     }
 
     /**
@@ -47,7 +47,7 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Float add(float baseValue, float difference) {
-        return null;
+        return baseValue + difference;
     }
 
     /**
@@ -56,7 +56,7 @@ public class MathUtilities {
      * @return sum of `baseValue` and `difference`
      */
     public Double add(double baseValue, double difference) {
-        return null;
+        return (baseValue + difference);
     }
 
     /**
@@ -65,7 +65,7 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Integer subtract(int baseValue, int difference) {
-        return null;
+        return baseValue - difference;
     }
 
     /**
@@ -74,7 +74,7 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Long subtract(long baseValue, long difference) {
-        return null;
+        return baseValue - difference;
     }
 
     /**
@@ -83,7 +83,7 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Short subtract(short baseValue, short difference) {
-        return null;
+        return (short) (baseValue - difference);
     }
 
     /**
@@ -92,7 +92,7 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Byte subtract(byte baseValue, byte difference) {
-        return null;
+        return (byte) (baseValue - difference);
     }
 
     /**
@@ -101,7 +101,7 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Float subtract(float baseValue, float difference) {
-        return null;
+        return baseValue - difference;
     }
 
     /**
@@ -110,7 +110,7 @@ public class MathUtilities {
      * @return difference between `baseValue` and `difference`
      */
     public Double subtract(double baseValue, double difference) {
-        return null;
+        return baseValue - difference;
     }
 
 
@@ -120,7 +120,7 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Integer divide(int dividend, int divisor) {
-        return null;
+        return dividend / divisor;
     }
 
     /**
@@ -129,7 +129,7 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Long divide(long dividend, long divisor) {
-        return null;
+        return dividend / divisor;
     }
 
     /**
@@ -138,7 +138,7 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Short divide(short dividend, short divisor) {
-        return null;
+        return (short) (dividend / divisor);
     }
 
     /**
@@ -147,7 +147,7 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Byte divide(byte dividend, byte divisor) {
-        return null;
+        return (byte) (dividend / divisor);
     }
 
     /**
@@ -156,7 +156,7 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Float divide(float dividend, float divisor) {
-        return null;
+        return dividend / divisor;
     }
 
     /**
@@ -165,7 +165,7 @@ public class MathUtilities {
      * @return division of `dividend` by `divisor
      */
     public Double divide(double dividend, double divisor) {
-        return null;
+        return dividend / divisor;
     }
 
 
@@ -175,7 +175,7 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Integer multiply(int multiplicand, int multiplier) {
-        return null;
+        return multiplicand * multiplier;
     }
 
     /**
@@ -184,7 +184,7 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Long multiply(long multiplicand, long multiplier) {
-        return null;
+        return multiplicand * multiplier;
     }
 
     /**
@@ -193,7 +193,7 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Short multiply(short multiplicand, short multiplier) {
-        return null;
+        return (short) (multiplicand * multiplier);
     }
     /**
      * @param multiplicand value to be multiplied
@@ -201,7 +201,7 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Byte multiply(byte multiplicand, byte multiplier) {
-        return null;
+        return (byte) (multiplicand * multiplier);
     }
 
     /**
@@ -210,7 +210,7 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Float multiply(float multiplicand, float multiplier) {
-        return null;
+        return multiplicand * multiplier;
     }
 
     /**
@@ -219,7 +219,7 @@ public class MathUtilities {
      * @return product of `multiplicand` by `multiplier`
      */
     public Double multiply(double multiplicand, double multiplier) {
-        return null;
+        return multiplicand * multiplier;
     }
 
 
@@ -227,14 +227,14 @@ public class MathUtilities {
       * @return true
      */
     public Boolean returnTrue() {
-        return null;
+        return true;
     }
 
     /**
      * @return false
      */
     public Boolean returnFalse() {
-        return null;
+        return false;
     }
 
 }

PredicateUtilities.java

@@ -10,7 +10,12 @@ public class PredicateUtilities {
      * @return true if `x` is greater than `y`
      */
     public Boolean isGreaterThan(int x, int y) {
-        return null;
+        if (x > y){
+            return true;
+        }
+        else return false;
+            
+        
     }
 
     /**
@@ -19,7 +24,10 @@ public class PredicateUtilities {
      * @return true if `x` is less than `y`
      */
     public Boolean isLessThan(int x, int y) {
-        return null;
+        if (x < y){
+            return true;
+        }
+        else return false;
     }
 
     /**
@@ -28,7 +36,10 @@ public class PredicateUtilities {
      * @return true if `x` is greater than or equal to `y`
      */
     public Boolean isGreaterThanOrEqualTo(int x, int y) {
-        return null;
+        if (x >= y) {
+            return true;
+        }
+        else return false;
     }
 
     /**
@@ -37,6 +48,9 @@ public class PredicateUtilities {
      * @return true if `x` is less than or equal to `y`
      */
     public Boolean isLessThanOrEqualTo(int x, int y) {
-        return null;
+        if (x <= y) {
+            return true;
+    }
+        else return false;
     }
 }

StringUtilities.java

@@ -8,7 +8,7 @@ public class StringUtilities {
      * @return `Hello World` as a string
      */
     public static String getHelloWorld() {
-        return null;
+        return "Hello World";
     }
 
     /**
@@ -17,7 +17,8 @@ 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 +27,8 @@ public class StringUtilities {
      * @return the concatenation of an integer, `firstSegment`, and a String, `secondSegment`
      */
     public static String concatenation(int firstSegment, String secondSegment){
-        return null;
+        String str1 = Integer.toString(firstSegment);
+        return firstSegment + secondSegment;
     }
 
     /**
@@ -34,7 +36,7 @@ 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 +44,7 @@ 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 +53,8 @@ public class StringUtilities {
      * @return the equivalence of two strings, `inputValue` and `comparableValue`
      */
     public static Boolean compareTwoStrings(String inputValue, String comparableValue){
-        return null;
+         
+        return inputValue == comparableValue;
     }
 
     /**
@@ -59,7 +62,7 @@ public class StringUtilities {
      * @return the middle character of `inputValue`
      */
     public static Character getMiddleCharacter(String inputValue){
-        return null;
+        return inputValue.charAt((inputValue.length()-1) / 2);
     }
 
     /**
@@ -67,7 +70,8 @@ public class StringUtilities {
      * @return the first sequence of characters
      */
     public static String getFirstWord(String spaceDelimitedString){
-        return null;
+        String[] stringWords = spaceDelimitedString.split(" ");
+        return stringWords[0];
     }
 
     /**
@@ -75,7 +79,8 @@ public class StringUtilities {
      * @return the second word of a string delimited by spaces.
      */
     public static String getSecondWord(String spaceDelimitedString){
-        return null;
+        String[] stringWords = spaceDelimitedString.split(" ");
+        return stringWords[1];
     }
 
     /**
@@ -83,6 +88,12 @@ public class StringUtilities {
      * @return an identical string with characters in reverse order.
      */
     public static String reverse(String stringToReverse){
-        return null;
+        StringBuilder reverse = new StringBuilder();
+        
+        for (int i = stringToReverse.length()-1; i >= 0;  i--){
+            reverse.append(stringToReverse.charAt(i));
+        }
+        
+        return reverse.toString();
     }
 }

package.bluej

@@ -1,18 +1,18 @@
 #BlueJ package file
-editor.fx.0.height=0
-editor.fx.0.width=0
-editor.fx.0.x=0
-editor.fx.0.y=0
-objectbench.height=129
-objectbench.width=1171
+editor.fx.0.height=722
+editor.fx.0.width=800
+editor.fx.0.x=320
+editor.fx.0.y=58
+objectbench.height=128
+objectbench.width=791
 package.divider.horizontal=0.6
-package.divider.vertical=0.7490774907749077
-package.editor.height=399
-package.editor.width=1069
-package.editor.x=59
-package.editor.y=63
+package.divider.vertical=0.7509225092250923
+package.editor.height=400
+package.editor.width=689
+package.editor.x=287
+package.editor.y=23
 package.frame.height=600
-package.frame.width=1195
+package.frame.width=815
 package.numDependencies=0
 package.numTargets=6
 package.showExtends=true