Numbers triangles and tables.

NumberUtilities.java

@@ -4,29 +4,81 @@
 public class NumberUtilities {
 
     public static String getRange(int stop) {
-        return null;
+        StringBuilder sb = new StringBuilder ();
+        
+        for (int i=0; i < stop; i++) { 
+            
+            sb.append(i);
+        }
+        //to convert back to string from int
+        return sb.toString();
     }
 
     public static String getRange(int start, int stop) {
-        return null;
+        StringBuilder sb = new StringBuilder ();
+        
+        for (int i = start; i < stop; i++) {
+        
+            sb.append(i);
+        }
+        return sb.toString(); 
+      
     }
 
 
     public static String getRange(int start, int stop, int step) {
-        return null;
+        StringBuilder sb = new StringBuilder ();
+        //or can use String string " ".
+        for (int i = start; i < stop; i += step) { 
+            
+            sb.append(i);
+            
+        }
+       return sb.toString();
+       
     }
 
     public static String getEvenNumbers(int start, int stop) {
-        return null;
+        StringBuilder sb = new StringBuilder ();
+        
+        for ( int i = start; i < stop; i ++){
+               
+            if ( i % 2 == 0)
+            
+            sb.append(i);
+        }
+        
+        
+        return sb.toString();
     }
 
 
+    
     public static String getOddNumbers(int start, int stop) {
-        return null;
+        StringBuilder sb = new StringBuilder ();
+        
+        for (int i = start; i < stop; i ++) {
+           
+            if (i % 2 != 0)
+            
+            sb.append(i);
+            
+       
+        }
+        return sb.toString();
     }
 
 
     public static String getExponentiations(int start, int stop, int exponent) {
-        return null;
+        StringBuilder sb = new StringBuilder();
+        
+        for (int i = start; i <= stop; i++) {
+            sb.append((int)Math.pow(i, exponent));
+            
+            
+    }
+     
+   
+        return sb.toString();
     }
 }

TableUtilities.java

@@ -1,15 +1,49 @@
- 
 
 public class TableUtilities {
     public static String getSmallMultiplicationTable() {
-        return null;
+       StringBuilder builder =  new StringBuilder();
+
+        for (int i = 1; i <= 4; i++) {
+            for (int j =1; j <= 4; j++) {
+
+                String value = String.format("%3d |", i * j);
+                builder.append(value);
+            }
+            builder.append("\n");
+
+        }
+        return builder.toString();
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+        StringBuilder builder =  new StringBuilder();
+
+        for (int i = 1; i <= 9; i++) {
+            for (int j =1; j <= 9; j++) {
+
+                String value = String.format("%3d |", i * j);
+                builder.append(value);
+            }
+            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 j =1; j <= tableSize; j++) {
+
+                String value = String.format("%3d |", i * j);
+                builder.append(value);
+            }
+            builder.append("\n");
+
+        }
+        return builder.toString();
     }
 }

TriangleUtilities.java

@@ -3,19 +3,70 @@
 public class TriangleUtilities {
 
     public static String getRow(int numberOfStars) {
-        return null;
+        StringBuilder sb = new StringBuilder();
+        //String str = "";
+        for (int i =0; i < numberOfStars; i++){
+        //str += "*";
+        sb = sb.append("*");
+        }
+        //return str;
+        return sb.toString();
     }
     
     public static String getTriangle(int numberOfRows) {
-        return null;
+        StringBuilder sb = new StringBuilder();
+        
+        for (int i = 0; i < numberOfRows; i++) {
+        
+            for (int j = 0; j <= i; j++) 
+            {
+                //if (j<i)
+                
+                sb = sb.append("*");
+            }
+              sb.append("\n");
+        }
+      
+        return sb.toString();
     }
 
 
     public static String getSmallTriangle() {
-        return null;
+        StringBuilder sb = new StringBuilder();
+        
+        for (int i = 0; i < 4; i++) {
+        
+            for (int j = 0; j <= i; j++) 
+            {
+                //if (j<i)
+                
+                sb.append("*");
+            }
+            sb.append("\n");
+        }
+        
+        
+        System.out.print(sb);
+        return sb.toString(); 
     }
 
     public static String getLargeTriangle() {
-        return null;
+    StringBuilder sb = new StringBuilder();
+        
+        for (int i = 0; i < 9; i++) {
+        
+            for (int j = 0; j <= i; j++) 
+            {
+                //if (j<i)
+                
+                sb.append("*");
+            }
+            sb.append("\n");
+        }
+        
+        
+        System.out.print(sb);
+        return sb.toString(); 
     }
+    
 }

package.bluej

@@ -1,27 +1,27 @@
 #BlueJ package file
-dependency1.from=NumberUtilitiesTest
-dependency1.to=NumberUtilities
+dependency1.from=TableUtilitiesTest
+dependency1.to=TableUtilities
 dependency1.type=UsesDependency
 dependency2.from=TriangleUtilitiesTest
 dependency2.to=TriangleUtilities
 dependency2.type=UsesDependency
-dependency3.from=TableUtilitiesTest
-dependency3.to=TableUtilities
+dependency3.from=NumberUtilitiesTest
+dependency3.to=NumberUtilities
 dependency3.type=UsesDependency
 editor.fx.0.height=722
 editor.fx.0.width=800
-editor.fx.0.x=537
-editor.fx.0.y=28
-objectbench.height=164
-objectbench.width=484
+editor.fx.0.x=107
+editor.fx.0.y=23
+objectbench.height=100
+objectbench.width=387
 package.divider.horizontal=0.6
-package.divider.vertical=0.7560627674750356
-package.editor.height=523
-package.editor.width=382
-package.editor.x=20
-package.editor.y=57
-package.frame.height=759
-package.frame.width=508
+package.divider.vertical=0.5977443609022557
+package.editor.height=152
+package.editor.width=269
+package.editor.x=869
+package.editor.y=458
+package.frame.height=324
+package.frame.width=411
 package.numDependencies=3
 package.numTargets=6
 package.showExtends=true