Hexagonal Architecture in Java - incorporated feedback

core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/hexagon/ConstantTaxRateRepository.java

@@ -1,11 +1,10 @@
 package com.baeldung.hexagon;
 
-public class ConstantTaxRateRepository implements TaxRateRepository{
+public class ConstantTaxRateRepository implements TaxRateRepository {
+    private static final double TAX_RATE = 0.13d;
 
-	private static final double TAX_RATE = 0.13d;
-	
-	@Override
-	public double getRate() {
-		return TAX_RATE;
-	}
+    @Override
+    public double getRate() {
+        return TAX_RATE;
+    }
 }

core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/hexagon/TaxCalculator.java

@@ -2,16 +2,15 @@ package com.baeldung.hexagon;
 
 public class TaxCalculator implements TaxService {
 
-	private TaxRateRepository taxRateRepository;
+    private TaxRateRepository taxRateRepository;
 
-	public TaxCalculator(TaxRateRepository repository) {
-		super();
-		taxRateRepository = repository;
-	}
+    public TaxCalculator(TaxRateRepository repository) {
+        super();
+        taxRateRepository = repository;
+    }
 
-	@Override
-	public double calculateTax(Double amount) {
-		return amount * taxRateRepository.getRate();
-	}
-	
+    @Override
+    public double calculateTax(double amount) {
+        return amount * taxRateRepository.getRate();
+    }
 }

core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/hexagon/TaxFactory.java

@@ -1,13 +1,11 @@
 package com.baeldung.hexagon;
 
 public class TaxFactory {
-	
-	public static TaxService getTaxService() {
-		return new TaxCalculator(getTaxRepository());
-	}
-	
-	public static TaxRateRepository getTaxRepository() {
-		return new ConstantTaxRateRepository();
-	}
+    public static TaxService getTaxService() {
+        return new TaxCalculator(getTaxRepository());
+    }
 
+    public static TaxRateRepository getTaxRepository() {
+        return new ConstantTaxRateRepository();
+    }
 }

core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/hexagon/TaxRateRepository.java

@@ -1,6 +1,5 @@
 package com.baeldung.hexagon;
 
 public interface TaxRateRepository {
-
-	public double getRate();
+    public double getRate();
 }

core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/hexagon/TaxService.java

@@ -1,7 +1,5 @@
 package com.baeldung.hexagon;
 
 public interface TaxService {
-
-	public double calculateTax(Double amount);
-	
+    public double calculateTax(double amount);
 }

core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/hexagon/TestTaxUser.java

@@ -2,8 +2,8 @@ package com.baeldung.hexagon;
 
 public class TestTaxUser {
 
-	public double calculateTax(Double amount) {
-		return TaxFactory.getTaxService().calculateTax(amount);
-	}
-
+    public double calculateTax(Double amount) {
+        return TaxFactory.getTaxService()
+            .calculateTax(amount);
+    }
 }