feat(03-tax-calculator): Добавлено задание

labs/03-tax-calculator/app/build.gradle.kts

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+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java application project to get you started.
+ * For more details on building Java & JVM projects, please refer to https://docs.gradle.org/8.10.2/userguide/building_java_projects.html in the Gradle documentation.
+ */
+
+plugins {
+    // Apply the application plugin to add support for building a CLI application in Java.
+    application
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    // This dependency is used by the application.
+    implementation(libs.guava)
+}
+
+// Apply a specific Java toolchain to ease working on different environments.
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(23)
+    }
+}
+
+application {
+    // Define the main class for the application.
+    mainClass = "ru.mrqiz.taxes.App"
+}
+
+tasks.named<Test>("test") {
+    // Use JUnit Platform for unit tests.
+    useJUnitPlatform()
+}
+
+tasks.named<JavaExec>("run") {
+   standardInput = System.`in`
+}
+

labs/03-tax-calculator/app/src/main/java/ru/mrqiz/taxes/App.java

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+package ru.mrqiz.taxes;
+
+public class App {
+  public static void main(String[] args) {
+    TaxCalculator calc = new TaxCalculator();
+    System.out.println(calc.calculateTax("Физ", 100000.0)); // 13%
+    System.out.println(calc.calculateTax("ИП", 1000000.0)); // 15%
+    System.out.println(calc.calculateTax("Сам", 10.0)); // 6%
+  }
+}

labs/03-tax-calculator/app/src/main/java/ru/mrqiz/taxes/Calculator.java

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+package ru.mrqiz.taxes;
+
+public interface Calculator {
+
+  public double calculateTax(Double amount);
+    
+}

labs/03-tax-calculator/app/src/main/java/ru/mrqiz/taxes/Main.java

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+package ru.mrqiz.taxes;
+
+public class Main {
+
+    public static void main(String[] args) {
+        TaxCalculator calc = new TaxCalculator();
+        System.out.println(calc.calculateTax("Физ", 100000.0)); // 13%
+        System.out.println(calc.calculateTax("ИП", 1000000.0)); // 15%
+        System.out.println(calc.calculateTax("Сам", 10.0)); // 6%
+    }
+    
+}

labs/03-tax-calculator/app/src/main/java/ru/mrqiz/taxes/TaxCalculator.java

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+package ru.mrqiz.taxes;
+
+public class TaxCalculator {
+
+  private Calculator getCalculatorByType(String type) {
+    switch (type) {
+      case "Физ" -> {
+        return new TaxPhysCalculator();
+      }
+      case "ИП" -> {
+        return new TaxIndEntCalculator();
+      }
+      case "Сам" -> {
+        return new TaxSelfCalculator();
+      }
+      default -> throw new AssertionError();
+    }
+  }
+
+  public double calculateTax(String type, Double amount) {
+      Calculator c = this.getCalculatorByType(type);
+      return c.calculateTax(amount);
+  };
+    
+}

labs/03-tax-calculator/app/src/main/java/ru/mrqiz/taxes/TaxIndEntCalculator.java

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+package ru.mrqiz.taxes;
+
+public class TaxIndEntCalculator implements Calculator {
+
+  @Override
+  public double calculateTax(Double amount) {
+    return amount * 0.15;
+  };
+  
+}

labs/03-tax-calculator/app/src/main/java/ru/mrqiz/taxes/TaxPhysCalculator.java

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+package ru.mrqiz.taxes;
+
+public class TaxPhysCalculator implements Calculator {
+
+  @Override
+  public double calculateTax(Double amount) {
+    return amount * 0.13;
+  };
+  
+}

labs/03-tax-calculator/app/src/main/java/ru/mrqiz/taxes/TaxSelfCalculator.java

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+package ru.mrqiz.taxes;
+
+public class TaxSelfCalculator implements Calculator {
+
+  @Override
+  public double calculateTax(Double amount) {
+    return amount * 0.06;
+  };
+  
+}