final edit of triangles

NumberUtilities.java

@@ -1,32 +1,58 @@
- 
-
+import java.lang.StringBuilder;
 
 public class NumberUtilities {
-    
-    public static String getRange(int start) {
-        return null;
+
+    public static String getRange(int stop) {
+        StringBuilder builder = new StringBuilder();
+        for(int i = 0; i < stop; i++) {
+            builder.append(i);
+        }
+        return builder.toString();
     }
-    
+
     public static String getRange(int start, int stop) {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        for(int i = start; i < stop; i++) {
+            builder.append(i);
+        }
+        return builder.toString();
     }
 
-
     public static String getRange(int start, int stop, int step) {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        for(int i = start; i < stop; i+= step) {
+            builder.append(i);
+        }
+        return builder.toString();
     }
-    
+
     public static String getEvenNumbers(int start, int stop) {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        for(int i = start; i < stop; i++) {
+            if (i % 2 == 0){
+                builder.append(i);
+            }
+        }
+        return builder.toString();
     }
 
-
     public static String getOddNumbers(int start, int stop) {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        for(int i = start; i < stop; i++) {
+            if (i % 2 != 0){
+                 builder.append(i);
+            }
+        }
+        return builder.toString();
     }
 
-
     public static String getExponentiations(int start, int stop, int exponent) {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        for(int i = start; i <= stop; i++) {
+
+            int k = (int)(Math.pow(i, exponent));
+            builder.append(k);
+        }
+        return builder.toString();
     }
 }

TableUtilities.java

@@ -2,14 +2,38 @@
 
 public class TableUtilities {
     public static String getSmallMultiplicationTable() {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        for (int i = 1; i <= 5; i++) {
+            for(int x = 1; x <= 5; x++) {
+                int j = (i * x);
+                builder.append(String.format("%3d |", j));
+            }
+             builder.append("\n");
+        }
+        return builder.toString();
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        for (int i = 1; i <= 10; i++) {
+            for(int x = 1; x <= 10; x++) {
+                int j = (i * x);
+                builder.append(String.format("%3d |", j));
+            }
+             builder.append("\n");
+        }
+        return builder.toString();
     }
 
     public static String getMultiplicationTable(int tableSize) {
-        return null;
+       StringBuilder builder = new StringBuilder();
+        for (int i = 1; i <= tableSize; i++) {
+            for(int x = 1; x <= tableSize; x++) {
+                int j = (i * x);
+                builder.append(String.format("%3d |", j));
+            }
+             builder.append("\n");
+        }
+        return builder.toString();
     }
 }

TriangleUtilities.java

@@ -3,19 +3,39 @@
 public class TriangleUtilities {
 
     public static String getRow(int numberOfStars) {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        for (int i = 0; i < numberOfStars; i++){
+            builder.append("*");
+        }
+        
+        return builder.toString();
     }
     
     public static String getTriangle(int numberOfRows) {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        for (int i = 1; i <= numberOfRows; i++){
+            String s = getRow(i);
+            builder.append(s + "\n");
+        }
+        return builder.toString();
     }
 
 
     public static String getSmallTriangle() {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        for (int i = 1; i <= 4; i++){
+            String s = getRow(i);
+            builder.append(s + "\n");
+        }
+        return builder.toString();
     }
 
     public static String getLargeTriangle() {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        for (int i = 1; i <= 9; i++){
+            String s = getRow(i);
+            builder.append(s + "\n");
+        }
+        return builder.toString();
     }
 }