Addes separate classes/interfaces for Operations

Java Classes & Interfaces/New Calc Engine/src/Adder.java

@@ -0,0 +1,28 @@
+public class Adder extends CalculateBase implements MathProcessing {
+
+    public Adder() {}
+
+    public Adder(double leftVal, double rightVal) {
+        super(leftVal, rightVal);
+    }
+
+    @Override
+    public void calculate() {
+        setResult(getLeftVal() + getRightVal());
+    }
+
+    // Using interfaces
+    @Override
+    public String getKeyWord() {
+        return "add";
+    }
+
+    @Override
+    public double doCalculation(double leftVal, double rightVal) {
+        setLeftVal(leftVal);
+        setRightVal(rightVal);
+        calculate();
+        
+        return getResult();
+    }
+}

Java Classes & Interfaces/New Calc Engine/src/Divider.java

@@ -0,0 +1,13 @@
+public class Divider extends CalculateBase {
+
+    public Divider() {}
+
+    public Divider(double leftVal, double rightVal) {
+        super(leftVal, rightVal);
+    }
+
+    @Override
+    public void calculate() {
+        setResult(getLeftVal() / getRightVal());
+    }
+}

Java Classes & Interfaces/New Calc Engine/src/Multiplier.java

@@ -0,0 +1,13 @@
+public class Multiplier extends CalculateBase {
+
+    public Multiplier() {}
+
+    public Multiplier(double leftVal, double rightVal) {
+        super(leftVal, rightVal);
+    }
+
+    @Override
+    public void calculate() {
+        setResult(getLeftVal() * getRightVal());
+    }
+}

Java Classes & Interfaces/New Calc Engine/src/PowerOf.java

@@ -0,0 +1,21 @@
+public class PowerOf implements MathProcessing {
+
+    private String formattedOutput;
+
+    @Override
+    public String getKeyWord() {
+        return "power";
+    }
+
+    @Override
+    public String doFormatting() {
+        return formattedOutput;
+    } 
+
+    @Override
+    public double doCalculation(double leftVal, double rightVal) {
+        double product = Math.pow(leftVal, rightVal);
+        formattedOutput = leftVal + " Has Been Raised To The Power Of " + rightVal + " Which Results In: " + product;
+        return product;
+    }
+}

Java Classes & Interfaces/New Calc Engine/src/Subtractor.java

@@ -0,0 +1,13 @@
+public class Subtractor extends CalculateBase {
+
+    public Subtractor() {} 
+
+    public Subtractor(double leftVal, double rightVal) {
+        super(leftVal, rightVal);
+    }
+
+    @Override
+    public void calculate() {
+        setResult(getLeftVal() - getRightVal());
+    }
+}