String lab1

MathUtilities.java

     * @return sum of `baseValue` and `difference`
     */
    public Integer add(int baseValue, int difference) {
-       return null;
+       return baseValue + difference;
    }
 
    /**
     * @return sum of `baseValue` and `difference`
     */
    public Long add(long baseValue, long difference) {
-       return null;
+       return baseValue + difference;
    }
 
    /**
     * @return sum of `baseValue` and `difference`
     */
    public Short add(short baseValue, short difference) {
-       return null;
+       return (short)(baseValue + difference);
    }
 
    /**
     * @return sum of `baseValue` and `difference`
     */
    public Byte add(byte baseValue, byte difference) {
-       return null;
+       return (byte)(baseValue + difference);
    }
 
    /**
     * @return sum of `baseValue` and `difference`
     */
    public Float add(float baseValue, float difference) {
-       return null;
+       return (float)(baseValue + difference);
    }
 
    /**
     * @return sum of `baseValue` and `difference`
     */
    public Double add(double baseValue, double difference) {
-       return null;
+       return (double)( baseValue + difference);
    }
 
    /**
     * @return difference between `baseValue` and `difference`
     */
    public Integer subtract(int baseValue, int difference) {
-       return null;
+       return baseValue - difference;
    }
 
    /**
     * @return difference between `baseValue` and `difference`
     */
    public Long subtract(long baseValue, long difference) {
-       return null;
+       return baseValue - difference;
    }
 
    /**
     * @return difference between `baseValue` and `difference`
     */
    public Short subtract(short baseValue, short difference) {
-       return null;
+       return (short) (baseValue - difference);
    }
 
    /**
     * @return difference between `baseValue` and `difference`
     */
    public Byte subtract(byte baseValue, byte difference) {
-       return null;
+       return (byte) ( baseValue - difference);
    }
 
    /**
     * @return difference between `baseValue` and `difference`
     */
    public Float subtract(float baseValue, float difference) {
-       return null;
+       return (float) (baseValue - difference);
    }
 
    /**
     * @return difference between `baseValue` and `difference`
     */
    public Double subtract(double baseValue, double difference) {
-       return null;
+       return (double) ( baseValue - difference);
    }
 
 
     * @return division of `dividend` by `divisor
     */
    public Integer divide(int dividend, int divisor) {
-       return null;
+       return dividend / divisor;
    }
 
    /**
     * @return division of `dividend` by `divisor
     */
    public Long divide(long dividend, long divisor) {
-       return null;
+       return dividend / divisor;
    }
 
    /**
     * @return division of `dividend` by `divisor
     */
    public Short divide(short dividend, short divisor) {
-       return null;
+       return (short) (dividend / divisor);
    }
 
    /**
     * @return division of `dividend` by `divisor
     */
    public Byte divide(byte dividend, byte divisor) {
-       return null;
+       return (byte) ( dividend / divisor) ;
    }
 
    /**
     * @return division of `dividend` by `divisor
     */
    public Float divide(float dividend, float divisor) {
-       return null;
+       return (float) (dividend / divisor);
    }
 
    /**
     * @return division of `dividend` by `divisor
     */
    public Double divide(double dividend, double divisor) {
-       return null;
+       return (double) ( dividend / divisor) ;
    }
 
 
     * @return product of `multiplicand` by `multiplier`
     */
    public Integer multiply(int multiplicand, int multiplier) {
-       return null;
+       return multiplicand * multiplier;
    }
 
    /**
     * @return product of `multiplicand` by `multiplier`
     */
    public Long multiply(long multiplicand, long multiplier) {
-       return null;
+       return multiplicand * multiplier;
    }
 
    /**
     * @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
     * @return product of `multiplicand` by `multiplier`
     */
    public Byte multiply(byte multiplicand, byte multiplier) {
-       return null;
+       return (byte) ( multiplicand * multiplier);
    }
 
    /**
     * @return product of `multiplicand` by `multiplier`
     */
    public Float multiply(float multiplicand, float multiplier) {
-       return null;
+       return (float) (multiplicand * multiplier);
    }
 
    /**
     * @return product of `multiplicand` by `multiplier`
     */
    public Double multiply(double multiplicand, double multiplier) {
-       return null;
+       return (double) ( multiplicand * multiplier);
    }
 
 
      * @return true
     */
    public Boolean returnTrue() {
-       return null;
+       return true;
    }
 
    /**
     * @return false
     */
    public Boolean returnFalse() {
-       return null;
+       return false;
    }
 
 }

PredicateUtilities.java

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

StringUtilities.java

      * @return `Hello World` as a string
      */
     public String getHelloWorld() {
-        return null;
+        return "Hello World";
     }
 
     /**
      * @return the concatenation of two strings, `firstSegment`, and `secondSegment`
      */
     public String concatenation(String firstSegment, String secondSegment){
-        return null;
+        return firstSegment + secondSegment;
     }
 
     /**
      * @return the concatenation of an integer, `firstSegment`, and a String, `secondSegment`
      */
     public String concatenation(int firstSegment, String secondSegment){
-        return null;
+        return firstSegment + secondSegment;
     }
 
     /**
      * @return the first 3 characters of `input`
      */
     public String getPrefix(String input){
-        return null;
+        return input.substring(0 , 3);
     }
 
     /**
      * @return the last 3 characters of `input`
      */
     public String getSuffix(String input){
-        return null;
+        return input.substring(input.length()-3, input.length());
     }
 
     /**
      * @return the equivalence of two strings, `inputValue` and `comparableValue`
      */
     public Boolean compareTwoStrings(String inputValue, String comparableValue){
-        return null;
+        return inputValue.equals(comparableValue);
     }
 
     /**
      * @return the middle character of `inputValue`
      */
     public Character getMiddleCharacter(String inputValue){
-        return null;
-    }
+        if (inputValue.length() %2 ==0){
+            return inputValue.charAt((inputValue.length()/2) -1);
+            
+        } else{ return inputValue.charAt(inputValue.length()/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.substring(0, spaceDelimitedString.indexOf(" "));
     }
 
     /**
      * @return the second word of a string delimited by spaces.
      */
     public String getSecondWord(String spaceDelimitedString){
-        return null;
+        return spaceDelimitedString.substring 
+        (spaceDelimitedString.indexOf(" ")+1, spaceDelimitedString.length());
+              
     }
 
     /**
      * @return an identical string with characters in reverse order.
      */
     public String reverse(String stringToReverse){
-        return null;
+     
+        String sol ="";
+        for(int x = stringToReverse.length() -1; x>-1; x--){
+            sol+= stringToReverse.charAt(x);
+        }
+        return sol;
     }
 
     /**
      * @return an identical string with spaces removed.
      */
     public String removeWhitespace(String input){
-        return null;
+        return input.replaceAll("\\s", "");
     }
 
     /**
      * @return an identical string with spaces in the front and end removed.
      */
     public String trim(String input){
-        return null;
+        return input.trim();
     }
 }

StringUtilitiesTest.java

 
         // : When
         String actual = stringUtilities.getHelloWorld();
+      
 
         // : Then
         assertEquals(expected, actual);

package.bluej

 #BlueJ package file
-dependency1.from=StringUtilitiesTest
-dependency1.to=StringUtilities
+dependency1.from=PredicateUtilitiesTest
+dependency1.to=PredicateUtilities
 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=StringUtilitiesTest
+dependency3.to=StringUtilities
 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=722
+editor.fx.0.width=864
+editor.fx.0.x=201
+editor.fx.0.y=23
 objectbench.height=145
 objectbench.width=776
 package.divider.horizontal=0.6