edits

Calculations.java

@@ -1,4 +1,6 @@
 import java.util.ArrayList;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 public class Calculations
 {
@@ -89,7 +91,16 @@ public class Calculations
         //add this to the array list
         //if the size of the arraylist is 2
             //return the array list
-        //else return null
+        //else return null'
+        Pattern pattern = Pattern.compile("\\s?\\.?\\d+\\.?(\\d+)?\\s?");
+        Matcher matcher = pattern.matcher(userInput);
+        
+        while(matcher.find()){
+            String number = matcher.group().trim();
+            Double deci = Double.valueOf(number);
+            results.add(deci);
+        }
+        
         return results;
     }
     
@@ -98,7 +109,6 @@ public class Calculations
         //perform the operation
         //convert to string
         //return string
-        String answer = "";
         
         
         

OrderOfOperations.java

@@ -1,120 +0,0 @@
-public class OrderOfOperations {
-    ArrayList<String> contents;
-    String item;
-    OrderOfOperations check;
-
-    public static void main (String[] args){
-        Scanner input = new Scanner(System.in);
-        System.out.println("Enter an operation: ");
-        String a = input.nextLine();
-        OrderOfOperations go = new OrderOfOperations();
-        a = go.brackets(a);
-        System.out.println("Result: "+a);
-    }
-
-    public String brackets(String s){             //method which deal with brackets separately
-        check = new OrderOfOperations();
-        while(s.contains(Character.toString('('))||s.contains(Character.toString(')'))){
-            for(int o=0; o<s.length();o++){
-                try{                                                        //i there is not sign
-                    if((s.charAt(o)==')' || Character.isDigit(s.charAt(o))) //between separate brackets
-                    && s.charAt(o+1)=='('){                         //or number and bracket,
-                        s=s.substring(0,o+1)+"*"+(s.substring(o+1));        //it treat it as
-                    }                                                       //a multiplication
-                }catch (Exception ignored){}                                //ignore out of range ex
-                if(s.charAt(o)==')'){                                  //search for a closing bracket
-                    for(int i=o; i>=0;i--){
-                        if(s.charAt(i)=='('){                          //search for a opening bracket
-                            String in = s.substring(i+1,o);
-                            in = check.recognize(in);
-                            s=s.substring(0,i)+in+s.substring(o+1);
-                            i=o=0;
-                        }
-                    }
-                }
-            }
-            if(s.contains(Character.toString('('))||s.contains(Character.toString(')'))||
-            s.contains(Character.toString('('))||s.contains(Character.toString(')'))){
-                System.out.println("Error: incorrect brackets placement");
-                return "Error: incorrect brackets placement";
-            }
-        }
-        s=check.recognize(s);
-        return s;
-    }
-
-    public String recognize(String s){              //method divide String on numbers and operators
-        PutIt putIt = new PutIt();
-        contents = new ArrayList<String>();         //holds numbers and operators
-        item = "";
-        for(int i=s.length()-1;i>=0;i--){           //is scan String from right to left,
-            if(Character.isDigit(s.charAt(i))){     //Strings are added to list, if scan finds
-                item=s.charAt(i)+item;              //a operator, or beginning of String
-                if(i==0){
-                    putIt.put();
-                }
-            }else{
-                if(s.charAt(i)=='.'){
-                    item=s.charAt(i)+item;
-                }else if(s.charAt(i)=='-' && (i==0 || (!Character.isDigit(s.charAt(i-1))))){
-                    item=s.charAt(i)+item;          //this part should recognize
-                    putIt.put();                    //negative numbers
-                }else{
-                    putIt.put();                //it add already formed number and
-                    item+=s.charAt(i);          //operators to list
-                    putIt.put();                //as separate Strings
-                    if(s.charAt(i)=='|'){       //add empty String to list, before "|" sign,
-                        item+=" ";          //to avoid removing of any meaningful String
-                        putIt.put();        //in last part of result method
-                    }
-                }
-            }
-        }
-        contents = putIt.result(contents, "^", "|");    //check Strings
-        contents = putIt.result(contents, "*", "/");    //for chosen
-        contents = putIt.result(contents, "+", "-");    //operators
-        return contents.get(0);
-    }
-    public class PutIt{
-        public void put(){
-            if(!item.equals("")){
-                contents.add(0,item);
-                item="";
-            }
-        }
-
-public ArrayList<String>result(ArrayList<String> arrayList, String op1, String op2){
-            int scale = 10;                              //controls BigDecimal decimal point accuracy
-            BigDecimal result = new BigDecimal(0);
-            for(int c = 0; c<arrayList.size();c++){
-                if(arrayList.get(c).equals(op1)|| arrayList.get(c).equals(op2)){
-                    if(arrayList.get(c).equals("^")){
-                        result = new BigDecimal(arrayList.get(c-1)).pow(Integer.parseInt(arrayList.get(c+1)));
-                    }else if(arrayList.get(c).equals("|")){
-                        result = new BigDecimal(Math.sqrt(Double.parseDouble(arrayList.get(c+1))));
-                    }else if(arrayList.get(c).equals("*")){
-                        result = new BigDecimal(arrayList.get(c-1)).multiply
-                                (new BigDecimal(arrayList.get(c+1)));
-                    }else if(arrayList.get(c).equals("/")){
-                        result = new BigDecimal(arrayList.get(c-1)).divide
-                                (new BigDecimal(arrayList.get(c+1)),scale,BigDecimal.ROUND_DOWN);
-                    }else if(arrayList.get(c).equals("+")){
-                        result = new BigDecimal(arrayList.get(c-1)).add(new BigDecimal(arrayList.get(c+1)));
-                    }else if(arrayList.get(c).equals("-")){
-                        result = new BigDecimal(arrayList.get(c-1)).subtract(new BigDecimal(arrayList.get(c+1)));
-                    }
-                    try{       //in a case of to "out of range" ex
-                        arrayList.set(c, (result.setScale(scale, RoundingMode.HALF_DOWN).
-                                stripTrailingZeros().toPlainString()));
-                        arrayList.remove(c + 1);            //it replace the operator with result
-                        arrayList.remove(c-1);              //and remove used numbers from list
-                    }catch (Exception ignored){}
-                }else{
-                    continue;            
-                }
-                c=0;                     //loop reset, as arrayList changed size
-            }
-            return arrayList;
-        }
-    }
-}