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BAEL-6154: Migrate from Java 8 to Java 17 + tests (eugenp#13474)
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‎core-java-modules/core-java-17/src/main/java/com/baeldung/java8to17/Address.java‎

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package com.baeldung.java8to17;
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public class Address {
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private String street;
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private String city;
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private String pin;
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public Address(String street, String city, String pin) {
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super();
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this.street = street;
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this.city = city;
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this.pin = pin;
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}
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public String getStreet() {
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return street;
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}
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public void setStreet(String street) {
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this.street = street;
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}
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public String getCity() {
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return city;
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}
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public void setCity(String city) {
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this.city = city;
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}
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public String getPin() {
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return pin;
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}
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public void setPin(String pin) {
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this.pin = pin;
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}
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}

‎core-java-modules/core-java-17/src/main/java/com/baeldung/java8to17/Circle.java‎

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package com.baeldung.java8to17;
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public record Circle(double radius) implements Shape {
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}

‎core-java-modules/core-java-17/src/main/java/com/baeldung/java8to17/Person.java‎

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package com.baeldung.java8to17;
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public class Person {
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private String name;
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private Address address;
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public Person(String name, Address address) {
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super();
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this.name = name;
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this.address = address;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public Address getAddress() {
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return address;
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}
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public void setAddress(Address address) {
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this.address = address;
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}
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}

‎core-java-modules/core-java-17/src/main/java/com/baeldung/java8to17/Rectangle.java‎

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package com.baeldung.java8to17;
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public record Rectangle(double length, double width) implements Shape {
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}

‎core-java-modules/core-java-17/src/main/java/com/baeldung/java8to17/Shape.java‎

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package com.baeldung.java8to17;
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public interface Shape {
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}

‎core-java-modules/core-java-17/src/main/java/com/baeldung/java8to17/Student.java‎

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package com.baeldung.java8to17;
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public record Student(int rollNo, String name) {
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}

‎core-java-modules/core-java-17/src/test/java/com/baeldung/java17/Java8to17ExampleUnitTest.java‎

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package com.baeldung.java17;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.junit.Assert.assertThrows;
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import java.util.Arrays;
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import org.junit.jupiter.api.Test;
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import com.baeldung.java8to17.Address;
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import com.baeldung.java8to17.Circle;
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import com.baeldung.java8to17.Person;
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import com.baeldung.java8to17.Rectangle;
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import com.baeldung.java8to17.Student;
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public class Java8to17ExampleUnitTest {
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@Test
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void givenMultiLineText_whenUsingTextBlock_thenStringIsReturned() {
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String value = """
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This is a
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Multi-line
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Text
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""";
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assertThat(value).isEqualTo("This is a\nMulti-line\nText\n");
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}
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@Test
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void givenString_whenUsingUtilFunctions_thenReturnsExpectedResult() {
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assertThat(" ".isBlank());
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assertThat("Twinkle ".repeat(2)).isEqualTo("Twinkle Twinkle ");
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assertThat("Format Line".indent(4)).isEqualTo(" Format Line\n");
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assertThat("Line 1 \n Line2".lines()).asList().size().isEqualTo(2);
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assertThat(" Text with white spaces ".strip()).isEqualTo("Text with white spaces");
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assertThat("Car, Bus, Train".transform(s1 -> Arrays.asList(s1.split(","))).get(0)).isEqualTo("Car");
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}
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@Test
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void givenDataModel_whenUsingRecordType_thenBehavesLikeDTO() {
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Student student = new Student(10, "Priya");
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Student student2 = new Student(10, "Priya");
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assertThat(student.rollNo()).isEqualTo(10);
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assertThat(student.name()).isEqualTo("Priya");
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assertThat(student.equals(student2));
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assertThat(student.hashCode()).isEqualTo(student2.hashCode());
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}
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@Test
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void givenObject_whenThrowingNPE_thenReturnsHelpfulMessage() {
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Person student = new Person("Lakshmi", new Address("35, West Street", null, null));
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Exception exception = assertThrows(NullPointerException.class, () -> {
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student.getAddress().getCity().toLowerCase();
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});
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assertThat(exception.getMessage()).isEqualTo(
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"Cannot invoke \"String.toLowerCase()\" because the return value of \"com.baeldung.java8to17.Address.getCity()\" is null");
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}
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@Test
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void givenGenericObject_whenUsingPatternMatching_thenReturnsTargetType() {
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String city = null;
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Object obj = new Address("35, West Street", "Chennai", "6000041");
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if (obj instanceof Address address) {
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city = address.getCity();
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}
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assertThat(city).isEqualTo("Chennai");
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}
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@Test
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void givenGenericObject_whenUsingSwitchExpression_thenPatternMatchesRightObject() {
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Object shape = new Rectangle(10, 20);
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double circumference = switch (shape) {
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case Rectangle r -> 2 * r.length() + 2 * r.width();
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case Circle c -> 2 * c.radius() * Math.PI;
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default -> throw new IllegalArgumentException("Unknown shape");
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};
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assertThat(circumference).isEqualTo(60);
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}
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}

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