Add TransactionCalculator interface

solvena · Feb 20, 2026 · 0ec9bd5 · 0ec9bd5
1 parent c5abc66
commit 0ec9bd5
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/src/main/java/TransactionCalculator.java b/src/main/java/TransactionCalculator.java
@@ -0,0 +1,9 @@
+import java.math.BigDecimal;
+
+public interface TransactionCalculator {
+    // Methods in interface is automatically public abstract.
+    BigDecimal calculateGross();
+    BigDecimal calculateCommission();
+    BigDecimal calculateTax();
+    BigDecimal calculateTotal();
+}