Curtis Cook's Dan Do Better Drills Labs

MathUtilities.ctxt

@@ -1,6 +1,6 @@
 #BlueJ class context
 comment0.target=MathUtilities
-comment0.text=\n\ Created\ by\ dan\ on\ 6/14/17.\n
+comment0.text=\n\ Created\ by\ Curtis\ on\ 10/18/18.\n
 comment1.params=baseValue\ difference
 comment1.target=java.lang.Integer\ add(int,\ int)
 comment1.text=\n\ @param\ baseValue\ \ starting\ value\n\ @param\ difference\ value\ to\ add\ to\ starting\ value\n\ @return\ sum\ of\ `baseValue`\ and\ `difference`\n

MathUtilities.java

@@ -1,7 +1,7 @@
  
 
 /**
- * Created by dan on 6/14/17.
+ * Created by Curtis on 10/18/18.
  */
 public class MathUtilities {
 
@@ -10,8 +10,8 @@ public class MathUtilities {
      * @param difference value to add to starting value
      * @return sum of `baseValue` and `difference`
      */
-    public Integer add(int baseValue, int difference) {
-        return null;
+    public Integer add(int baseValue, int difference) {        
+        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.ctxt

@@ -1,6 +1,6 @@
 #BlueJ class context
 comment0.target=PredicateUtilities
-comment0.text=\n\ Created\ by\ dan\ on\ 6/14/17.\n
+comment0.text=\n\ Created\ by\ Curtis\ on\ 10/18/18.\n
 comment1.params=x\ y
 comment1.target=java.lang.Boolean\ isGreaterThan(int,\ int)
 comment1.text=\n\ @param\ x\n\ @param\ y\n\ @return\ true\ if\ `x`\ is\ greater\ than\ `y`\n

PredicateUtilities.java

@@ -1,7 +1,7 @@
  
 
 /**
- * Created by dan on 6/14/17.
+ * Created by Curtis on 10/18/18.
  */
 public class PredicateUtilities {
     /**
@@ -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 ? true : false;
     }
 
     /**
@@ -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 ? true : false;
     }
 
     /**
@@ -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 ? true : false;
     }
 
     /**
@@ -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 ? true : false;
     }
 }

StringUtilities.ctxt

@@ -1,6 +1,6 @@
 #BlueJ class context
 comment0.target=StringUtilities
-comment0.text=\n\ Created\ by\ dan\ on\ 6/14/17.\n
+comment0.text=\n\ Created\ by\ Curtis\ on\ 10/18/18.\n
 comment1.params=
 comment1.target=java.lang.String\ getHelloWorld()
 comment1.text=\n\ @return\ `Hello\ World`\ as\ a\ string\n

StringUtilities.java

@@ -1,14 +1,14 @@
  
 
 /**
- * Created by dan on 6/14/17.
+ * Created by Curtis on 10/18/18.
  */
 public class StringUtilities {
     /**
      * @return `Hello World` as a string
      */
     public static String getHelloWorld() {
-        return null;
+        return "Hello World";
     }
 
     /**
@@ -17,7 +17,7 @@ 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 +26,7 @@ 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 +34,7 @@ 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 +42,7 @@ 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 +51,7 @@ public class StringUtilities {
      * @return the equivalence of two strings, `inputValue` and `comparableValue`
      */
     public static Boolean compareTwoStrings(String inputValue, String comparableValue){
-        return null;
+        return inputValue.equals(comparableValue);
     }
 
     /**
@@ -59,7 +59,15 @@ public class StringUtilities {
      * @return the middle character of `inputValue`
      */
     public static Character getMiddleCharacter(String inputValue){
-        return null;
+        int halfOfStringLength = 0;
+        if(inputValue.length() % 2 == 0) {
+            halfOfStringLength = (inputValue.length() / 2) - 1;
+        } else {
+            halfOfStringLength = inputValue.length() / 2;
+        }
+            
+        char middleCharacter = inputValue.charAt(halfOfStringLength);
+        return middleCharacter;
     }
 
     /**
@@ -67,7 +75,15 @@ public class StringUtilities {
      * @return the first sequence of characters
      */
     public static String getFirstWord(String spaceDelimitedString){
-        return null;
+        String firstWord = " ";
+        for(int i = 0; i < spaceDelimitedString.length(); i++) {
+            if(Character.isWhitespace(spaceDelimitedString.charAt(i))) {
+                firstWord = spaceDelimitedString.substring(0, i);
+                break;
+            }
+        }
+            
+        return firstWord;
     }
 
     /**
@@ -75,7 +91,29 @@ public class StringUtilities {
      * @return the second word of a string delimited by spaces.
      */
     public static String getSecondWord(String spaceDelimitedString){
-        return null;
+        String secondWord = " ";
+        int beginningOfSecondWord = 0;
+        //int endOfSecondWord = 0;
+        for(int i = 0; i < spaceDelimitedString.length(); i++) {
+            if(Character.isWhitespace(spaceDelimitedString.charAt(i))) {
+                beginningOfSecondWord = i;
+                break;
+            }
+        }
+
+        /*
+        spaceDelimitedString = spaceDelimitedString.substring(beginningOfSecondWord + 1, spaceDelimitedString.length() - 1);
+        for(int i = 0; i < spaceDelimitedString.length(); i++) {
+            if(!Character.isWhitespace(spaceDelimitedString.charAt(i))) {
+                endOfSecondWord = i;
+                break;
+            }
+        }       
+        secondWord = spaceDelimitedString.substring(beginningOfSecondWord, endOfSecondWord);
+        */
+       
+        secondWord = spaceDelimitedString.substring(beginningOfSecondWord + 1, spaceDelimitedString.length());
+        return secondWord;
     }
 
     /**
@@ -83,6 +121,10 @@ public class StringUtilities {
      * @return an identical string with characters in reverse order.
      */
     public static String reverse(String stringToReverse){
-        return null;
+        StringBuilder reverseOrder = new StringBuilder();
+        for(int i = 0; i < stringToReverse.length(); i++) {
+            reverseOrder.insert(0, stringToReverse.charAt(i));
+        }
+        return reverseOrder.toString();
     }
 }

package.bluej

@@ -3,11 +3,11 @@ 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.y=63