create multiply method useing get number to check for erros

Calculations.java

@@ -6,6 +6,7 @@ public class Calculations
 {
     public static Console console = new Console();
     public static ArrayList<String> library = new ArrayList<String>();
+    public static String invalidArgumentsAmountError = "You have entered an invalid amount of arguments. Please only use two arguments, or switch to PEMDAS";
     
     public Calculations(){
    
@@ -28,7 +29,7 @@ public class Calculations
         
     }
 
-    public static void getCommand(String userInput)
+    public static String getCommand(String userInput)
     {
         boolean foundCommand = false;
         String command = "";
@@ -76,12 +77,12 @@ public class Calculations
                  Clear();
             break;
         }
-        System.out.println(result);
-        //return result;
+        return result;
     }
     
     public static ArrayList<Double> getNumbers(String userInput){
         ArrayList<Double> results = new ArrayList<Double>();
+        
         //takes in a string
         //finds the first occurence of a number
         //store it as a double ( left )
@@ -92,6 +93,7 @@ public class Calculations
         //if the size of the arraylist is 2
             //return the array list
         //else return null'
+        
         Pattern pattern = Pattern.compile("\\s?\\.?\\d+\\.?(\\d+)?\\s?");
         Matcher matcher = pattern.matcher(userInput);
         
@@ -101,19 +103,25 @@ public class Calculations
             results.add(deci);
         }
         
-        return results;
+        if(results.size() == 2)
+        { 
+            return results;
+        }
+        return null;
     }
     
     public static String Multiply(String userInput)
     {
-        //get getNumbers
-        //perform the operation
-        //convert to string
-        //return string
-        
-        
-        
-        return null;
+        String result = "";
+        ArrayList<Double> results = getNumbers(userInput);
+        if(results != null)
+        {
+            Double product = results.get(0) * results.get(1);
+            result = String.valueOf(product);
+            return result;
+        } else {
+            return invalidArgumentsAmountError;
+        }
     }
 
     public static String Divide(String userInput)

MainApplication.java

@@ -18,11 +18,13 @@ public class MainApplication {
     }
     
     public void Run(){
-        Scanner scanner = new Scanner(System.in);       
+        Scanner scanner = new Scanner(System.in); 
+        String result = "";
         while(this.on == true)
         {
             String userInput = scanner.nextLine();
-            calculator.getCommand(userInput); 
+            result = calculator.getCommand(userInput);
+            System.out.println(result);
         }
     }
     

package.bluej

@@ -8,32 +8,15 @@ dependency2.type=UsesDependency
 dependency3.from=Calculations
 dependency3.to=Console
 dependency3.type=UsesDependency
-editor.fx.0.height=716
-editor.fx.0.height=709
-editor.fx.0.width=800
-editor.fx.0.x=480
-editor.fx.0.y=23
-objectbench.height=198
-objectbench.width=595
-package.divider.horizontal=0.6
-package.divider.vertical=0.685099846390169
-package.editor.height=439
-package.editor.width=493
-package.editor.x=115
-package.editor.y=24
-package.frame.height=709
-package.frame.width=619
-package.numDependencies=0
-package.numTargets=2
-editor.fx.0.width=0
+editor.fx.0.height=800
+editor.fx.0.width=1280
 editor.fx.0.x=0
 editor.fx.0.y=0
-editor.fx.0.height=717
 objectbench.height=200
 objectbench.width=595
 package.divider.horizontal=0.6
 package.divider.vertical=0.6854103343465046
-package.editor.height=444
+package.editor.height=428
 package.editor.width=493
 package.editor.x=35
 package.editor.y=23
@@ -50,31 +33,23 @@ readme.width=47
 readme.x=10
 readme.y=10
 target1.height=50
-target1.name=OrderOfOperations
-target1.showInterface=false
-target1.type=ClassTarget
-target1.width=140
-target1.x=70
-target1.y=70
 target1.name=Calculations
 target1.showInterface=false
 target1.type=ClassTarget
 target1.width=100
-target1.x=120
-target1.y=150
+target1.x=310
+target1.y=260
 target2.height=50
 target2.name=Console
 target2.showInterface=false
 target2.type=ClassTarget
 target2.width=80
-target2.x=80
-target2.y=200
-target2.x=20
-target2.y=150
-target3.height=50
+target2.x=190
+target2.y=160
+target3.height=120
 target3.name=MainApplication
 target3.showInterface=false
 target3.type=ClassTarget
-target3.width=120
-target3.x=70
-target3.y=70
+target3.width=230
+target3.x=320
+target3.y=20