NumberUtilities.java

@@ -3,30 +3,64 @@
 
 public class NumberUtilities {
     
-    public static String getRange(int start) {
-        return null;
+    public static String getRange(int stop) {
+        StringBuilder strNumber = new StringBuilder();
+        
+        for (int i = 0; i <stop; i++) {
+            strNumber.append(i);
+        }
+        return strNumber.toString();
     }
-    
+   
     public static String getRange(int start, int stop) {
-        return null;
+        StringBuilder strNumber = new StringBuilder();
+        
+        for (int i = start; i <stop; i++) {
+            strNumber.append(i);
+        }
+        return strNumber.toString();
     }
 
 
     public static String getRange(int start, int stop, int step) {
-        return null;
+        StringBuilder strNumber = new StringBuilder();
+        
+        for (int i = start; i < stop; i = i+ step) {
+            strNumber.append(i);
+        }
+        return strNumber.toString();
     }
     
     public static String getEvenNumbers(int start, int stop) {
-        return null;
+        StringBuilder strNumber = new StringBuilder();
+        
+        for (int i = start; i < stop; i++) {
+            if (i%2 == 0) {
+            strNumber.append(i);}
+        }
+        return strNumber.toString();
     }
 
 
     public static String getOddNumbers(int start, int stop) {
-        return null;
+        StringBuilder strNumber = new StringBuilder();
+        
+        for (int i = start; i < stop; i++) {
+            if (i%2 == 1) {
+                strNumber.append(i);
+            }
+        }
+        return strNumber.toString();
     }
 
 
     public static String getExponentiations(int start, int stop, int exponent) {
-        return null;
+        StringBuilder strNumber = new StringBuilder();
+        
+        for (int i = start; i <=stop; i++) {
+            int result = (int)Math.pow(i,exponent);
+            strNumber.append(result);
+        }
+        return strNumber.toString();
     }
 }

TableUtilities.java

@@ -2,14 +2,47 @@
 
 public class TableUtilities {
     public static String getSmallMultiplicationTable() {
-        return null;
+        StringBuilder xTable = new StringBuilder();
+        int x;
+        int y;
+        for (x =1; x<=5; x++) 
+        {
+        for (y=1; y<=5; y++)
+        {
+         xTable.append(String.format("%3d |", x*y));   
+        }
+        xTable.append("\n");
+        }
+        return xTable.toString();
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+        StringBuilder xTable = new StringBuilder();
+        int x;
+        int y;
+        for (x =1; x<=10; x++) 
+        {
+        for (y=1; y<=10; y++)
+        {
+         xTable.append(String.format("%3d |", x*y));   
+        }
+        xTable.append("\n");
+        }
+        return xTable.toString();
     }
 
     public static String getMultiplicationTable(int tableSize) {
-        return null;
+        StringBuilder xTable = new StringBuilder();
+        int x;
+        int y;
+        for (x =1; x<=tableSize; x++) 
+        {
+        for (y=1; y<=tableSize; y++)
+        {
+         xTable.append(String.format("%3d |", x*y));   
+        }
+        xTable.append("\n");
+        }
+        return xTable.toString();
     }
 }

TriangleUtilities.java

@@ -3,19 +3,50 @@
 public class TriangleUtilities {
 
     public static String getRow(int numberOfStars) {
-        return null;
+        StringBuilder stringStars = new StringBuilder();
+        for (int i = 0; i < numberOfStars; i++) {
+        stringStars.append("*");
+        }
+        return stringStars.toString();
     }
     
     public static String getTriangle(int numberOfRows) {
-        return null;
+        StringBuilder strStars = new StringBuilder();
+        for (int i = 0; i <numberOfRows; i++) 
+        {
+            for (int j = 0; j <= i; j++) 
+            {
+                if (j<=i)
+                strStars.append("*");
+            }
+        strStars.append("\n");
+        }
+        return strStars.toString();
     }
-
-
     public static String getSmallTriangle() {
-        return null;
+        StringBuilder strStars = new StringBuilder();    
+        for (int i = 0; i <4; i++) 
+            {
+            for (int j = 0; j <= i; j++) 
+               {
+                if (j<=i)
+                strStars.append("*");
+                }
+            strStars.append("\n");
+        }
+        return strStars.toString();
     }
 
     public static String getLargeTriangle() {
-        return null;
+        StringBuilder strStars = new StringBuilder();    
+        for (int i = 0; i <9; i++) {
+            for (int j = 0; j <= i; j++)  {
+                if (j<=i) {
+                    strStars.append("*");
+                }
+            }
+            strStars.append("\n");
+        }
+        return strStars.toString();
     }
 }