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Feature/bael 4662 sealed classes (#10224) 

* BAEL-4662: Initial commit of new module

* BAEL-4662: Example with Records

* BAEL-4662: Example with Interface

* BAEL-4662: Add test classes

* BAEL-4662: Update examples and tests

* BAEL-4662: Rename test classes
This commit is contained in:
Daniel Strmecki 2020-11-03 20:37:30 +01:00 committed by GitHub
parent f40ed2cef5
commit 5116a45d1e
13 changed files with 389 additions and 0 deletions
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1
core-java-modules/core-java-15/.mvn/jvm.config Normal file
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--enable-preview

7
core-java-modules/core-java-15/README.md Normal file
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## Core Java 15
This module contains articles about Java 15.
### Relevant articles
- TODO: add article links here

77
core-java-modules/core-java-15/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-15</artifactId>
<name>core-java-15</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../pom.xml</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${apache-commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<release>${maven.compiler.release}</release>
<compilerArgs>--enable-preview</compilerArgs>
<source>15</source>
<target>15</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.release>15</maven.compiler.release>
<apache-commons-lang3.version>3.11</apache-commons-lang3.version>
<assertj.version>3.17.2</assertj.version>
<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
<surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
</properties>
</project>

49
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/alternative/Vehicles.java Normal file
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package com.baeldung.sealed.alternative;
public class Vehicles {
abstract static class Vehicle {
private final String registrationNumber;
public Vehicle(String registrationNumber) {
this.registrationNumber = registrationNumber;
}
public String getRegistrationNumber() {
return registrationNumber;
}
}
public static final class Car extends Vehicle {
private final int numberOfSeats;
public Car(int numberOfSeats, String registrationNumber) {
super(registrationNumber);
this.numberOfSeats = numberOfSeats;
}
public int getNumberOfSeats() {
return numberOfSeats;
}
}
public static final class Truck extends Vehicle {
private final int loadCapacity;
public Truck(int loadCapacity, String registrationNumber) {
super(registrationNumber);
this.loadCapacity = loadCapacity;
}
public int getLoadCapacity() {
return loadCapacity;
}
}
}

21
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/classes/Car.java Normal file
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package com.baeldung.sealed.classes;
public non-sealed class Car extends Vehicle implements Service {
private final int numberOfSeats;
public Car(int numberOfSeats, String registrationNumber) {
super(registrationNumber);
this.numberOfSeats = numberOfSeats;
}
public int getNumberOfSeats() {
return numberOfSeats;
}
@Override
public int getMaxServiceIntervalInMonths() {
return 12;
}
}

11
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/classes/Service.java Normal file
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package com.baeldung.sealed.classes;
public sealed interface Service permits Car, Truck {
int getMaxServiceIntervalInMonths();
default int getMaxDistanceBetweenServicesInKilometers() {
return 100000;
}
}

21
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/classes/Truck.java Normal file
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package com.baeldung.sealed.classes;
public final class Truck extends Vehicle implements Service {
private final int loadCapacity;
public Truck(int loadCapacity, String registrationNumber) {
super(registrationNumber);
this.loadCapacity = loadCapacity;
}
public int getLoadCapacity() {
return loadCapacity;
}
@Override
public int getMaxServiceIntervalInMonths() {
return 18;
}
}

15
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/classes/Vehicle.java Normal file
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package com.baeldung.sealed.classes;
public abstract sealed class Vehicle permits Car, Truck {
protected final String registrationNumber;
public Vehicle(String registrationNumber) {
this.registrationNumber = registrationNumber;
}
public String getRegistrationNumber() {
return registrationNumber;
}
}

14
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/records/Car.java Normal file
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package com.baeldung.sealed.records;
public record Car(int numberOfSeats, String registrationNumber) implements Vehicle {
@Override
public String getRegistrationNumber() {
return registrationNumber;
}
public int getNumberOfSeats() {
return numberOfSeats;
}
}

14
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/records/Truck.java Normal file
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package com.baeldung.sealed.records;
public record Truck(int loadCapacity, String registrationNumber) implements Vehicle {
@Override
public String getRegistrationNumber() {
return registrationNumber;
}
public int getLoadCapacity() {
return loadCapacity;
}
}

7
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/records/Vehicle.java Normal file
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package com.baeldung.sealed.records;
public sealed interface Vehicle permits Car, Truck {
String getRegistrationNumber();
}

76
core-java-modules/core-java-15/src/test/java/com/baeldung/sealed/classes/VehicleUnitTest.java Normal file
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package com.baeldung.sealed.classes;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import java.lang.constant.ClassDesc;
public class VehicleUnitTest {
private static Vehicle car;
private static Vehicle truck;
@BeforeAll
public static void createInstances() {
car = new Car(5, "VZ500DA");
truck = new Truck(19000, "VZ600TA");
}
@Test
public void givenCar_whenUsingReflectionAPI_thenSuperClassIsSealed() {
Assertions.assertThat(car.getClass().isSealed()).isEqualTo(false);
Assertions.assertThat(car.getClass().getSuperclass().isSealed()).isEqualTo(true);
Assertions.assertThat(car.getClass().getSuperclass().permittedSubclasses())
.contains(ClassDesc.of(car.getClass().getCanonicalName()));
}
@Test
public void givenTruck_whenUsingReflectionAPI_thenSuperClassIsSealed() {
Assertions.assertThat(truck.getClass().isSealed()).isEqualTo(false);
Assertions.assertThat(truck.getClass().getSuperclass().isSealed()).isEqualTo(true);
Assertions.assertThat(truck.getClass().getSuperclass().permittedSubclasses())
.contains(ClassDesc.of(truck.getClass().getCanonicalName()));
}
@Test
public void givenCar_whenGettingPropertyTraditionalWay_thenNumberOfSeatsPropertyIsReturned() {
Assertions.assertThat(getPropertyTraditionalWay(car)).isEqualTo(5);
}
@Test
public void givenCar_whenGettingPropertyViaPatternMatching_thenNumberOfSeatsPropertyIsReturned() {
Assertions.assertThat(getPropertyViaPatternMatching(car)).isEqualTo(5);
}
@Test
public void givenTruck_whenGettingPropertyTraditionalWay_thenLoadCapacityIsReturned() {
Assertions.assertThat(getPropertyTraditionalWay(truck)).isEqualTo(19000);
}
@Test
public void givenTruck_whenGettingPropertyViaPatternMatching_thenLoadCapacityIsReturned() {
Assertions.assertThat(getPropertyViaPatternMatching(truck)).isEqualTo(19000);
}
private int getPropertyTraditionalWay(Vehicle vehicle) {
if (vehicle instanceof Car) {
return ((Car) vehicle).getNumberOfSeats();
} else if (vehicle instanceof Truck) {
return ((Truck) vehicle).getLoadCapacity();
} else {
throw new RuntimeException("Unknown instance of Vehicle");
}
}
private int getPropertyViaPatternMatching(Vehicle vehicle) {
if (vehicle instanceof Car car) {
return car.getNumberOfSeats();
} else if (vehicle instanceof Truck truck) {
return truck.getLoadCapacity();
} else {
throw new RuntimeException("Unknown instance of Vehicle");
}
}
}

76
core-java-modules/core-java-15/src/test/java/com/baeldung/sealed/records/VehicleUnitTest.java Normal file
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package com.baeldung.sealed.records;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import java.lang.constant.ClassDesc;
public class VehicleUnitTest {
private static Vehicle car;
private static Vehicle truck;
@BeforeAll
public static void createInstances() {
car = new Car(4, "VZ500DA");
truck = new Truck(16000, "VZ600TA");
}
@Test
public void givenCar_whenUsingReflectionAPI_thenInterfaceIsSealed() {
Assertions.assertThat(car.getClass().isSealed()).isEqualTo(false);
Assertions.assertThat(car.getClass().getInterfaces()[0].isSealed()).isEqualTo(true);
Assertions.assertThat(car.getClass().getInterfaces()[0].permittedSubclasses())
.contains(ClassDesc.of(car.getClass().getCanonicalName()));
}
@Test
public void givenTruck_whenUsingReflectionAPI_thenInterfaceIsSealed() {
Assertions.assertThat(truck.getClass().isSealed()).isEqualTo(false);
Assertions.assertThat(truck.getClass().getInterfaces()[0].isSealed()).isEqualTo(true);
Assertions.assertThat(truck.getClass().getInterfaces()[0].permittedSubclasses())
.contains(ClassDesc.of(truck.getClass().getCanonicalName()));
}
@Test
public void givenCar_whenGettingPropertyTraditionalWay_thenNumberOfSeatsPropertyIsReturned() {
Assertions.assertThat(getPropertyTraditionalWay(car)).isEqualTo(4);
}
@Test
public void givenCar_whenGettingPropertyViaPatternMatching_thenNumberOfSeatsPropertyIsReturned() {
Assertions.assertThat(getPropertyViaPatternMatching(car)).isEqualTo(4);
}
@Test
public void givenTruck_whenGettingPropertyTraditionalWay_thenLoadCapacityIsReturned() {
Assertions.assertThat(getPropertyTraditionalWay(truck)).isEqualTo(16000);
}
@Test
public void givenTruck_whenGettingPropertyViaPatternMatching_thenLoadCapacityIsReturned() {
Assertions.assertThat(getPropertyViaPatternMatching(truck)).isEqualTo(16000);
}
private int getPropertyTraditionalWay(Vehicle vehicle) {
if (vehicle instanceof Car) {
return ((Car) vehicle).getNumberOfSeats();
} else if (vehicle instanceof Truck) {
return ((Truck) vehicle).getLoadCapacity();
} else {
throw new RuntimeException("Unknown instance of Vehicle");
}
}
private int getPropertyViaPatternMatching(Vehicle vehicle) {
if (vehicle instanceof Car car) {
return car.getNumberOfSeats();
} else if (vehicle instanceof Truck truck) {
return truck.getLoadCapacity();
} else {
throw new RuntimeException("Unknown instance of Vehicle");
}
}
}