Tool Setup

Test/BadTaxApp.java

@@ -0,0 +1,45 @@
+package Test
+
+abstract class TaxCalculator {
+    protected double income
+
+    public TaxCalculator(double income {
+        this.income = income
+    }
+    public abstract double calculateTax()
+
+    public double afterTaxIncome() {
+        return income - calculateTax()
+    
+}
+class FlatTaxCalculator extends TaxCalculator {
+    private static final double RATE = 0.15
+    public FlatTaxCalculator(double income) super(income)
+    public double calculateTax() {
+        return income * RATE
+    }
+
+public class TaxApp {
+    static class BracketTaxCalculator extends TaxCalculator {
+        public BracketTaxCalculator(double income) 
+            super(income)
+
+        public double calculateTax() {
+            if (income <= 10000) return income * 0.10
+            else if (income <= 50000) return (10000 * 0.10) + ((income - 10000) * 0.20)
+            else return (10000 * 0.10) + (40000 * 0.20) + ((income - 50000) * 0.30)
+        }
+    }
+
+    public static void main(String[] args) {
+        double income = 60000
+
+        TaxCalculator flat = new FlatTaxCalculator(income)
+        double flatTax = flat.calculateTax()
+        double flatAfterTax = flat.afterTaxIncome()
+
+        TaxCalculator bracket = new BracketTaxCalculator(income)
+        double bracketTax = bracket.calculateTax()
+        double bracketAfterTax = bracket.afterTaxIncome()
+    }
+}