From 9d2e94f5290187f3a48faa34d4363a25a49a951c Mon Sep 17 00:00:00 2001 From: Justin Albano Date: Mon, 11 May 2020 11:47:04 -0400 Subject: [PATCH] BAEL-3951: Added JDK 14 record example and associated tests. (#9270) --- .../com/baeldung/java14/record/Person.java | 22 +++ .../baeldung/java14/record/PersonTest.java | 150 ++++++++++++++++++ 2 files changed, 172 insertions(+) create mode 100644 core-java-modules/core-java-14/src/main/java/com/baeldung/java14/record/Person.java create mode 100644 core-java-modules/core-java-14/src/test/java/com/baeldung/java14/record/PersonTest.java diff --git a/core-java-modules/core-java-14/src/main/java/com/baeldung/java14/record/Person.java b/core-java-modules/core-java-14/src/main/java/com/baeldung/java14/record/Person.java new file mode 100644 index 0000000000..33243c4ecf --- /dev/null +++ b/core-java-modules/core-java-14/src/main/java/com/baeldung/java14/record/Person.java @@ -0,0 +1,22 @@ +package com.baeldung.java14.record; + +import java.util.Objects; + +public record Person (String name, String address) { + + public static String UNKWOWN_ADDRESS = "Unknown"; + public static String UNNAMED = "Unnamed"; + + public Person { + Objects.requireNonNull(name); + Objects.requireNonNull(address); + } + + public Person(String name) { + this(name, UNKWOWN_ADDRESS); + } + + public static Person unnamed(String address) { + return new Person(UNNAMED, address); + } +} diff --git a/core-java-modules/core-java-14/src/test/java/com/baeldung/java14/record/PersonTest.java b/core-java-modules/core-java-14/src/test/java/com/baeldung/java14/record/PersonTest.java new file mode 100644 index 0000000000..4a7d4ede5f --- /dev/null +++ b/core-java-modules/core-java-14/src/test/java/com/baeldung/java14/record/PersonTest.java @@ -0,0 +1,150 @@ +package com.baeldung.java14.record; + +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertFalse; +import static org.junit.Assert.assertNotEquals; +import static org.junit.Assert.assertTrue; + +import org.junit.Test; + +public class PersonTest { + + @Test + public void givenSameNameAndAddress_whenEquals_thenPersonsEqual() { + + String name = "John Doe"; + String address = "100 Linda Ln."; + + Person person1 = new Person(name, address); + Person person2 = new Person(name, address); + + assertTrue(person1.equals(person2)); + } + + @Test + public void givenDifferentObject_whenEquals_thenNotEqual() { + + Person person = new Person("John Doe", "100 Linda Ln."); + + assertFalse(person.equals(new Object())); + } + + @Test + public void givenDifferentName_whenEquals_thenPersonsNotEqual() { + + String address = "100 Linda Ln."; + + Person person1 = new Person("Jane Doe", address); + Person person2 = new Person("John Doe", address); + + assertFalse(person1.equals(person2)); + } + + @Test + public void givenDifferentAddress_whenEquals_thenPersonsNotEqual() { + + String name = "John Doe"; + + Person person1 = new Person(name, "100 Linda Ln."); + Person person2 = new Person(name, "200 London Ave."); + + assertFalse(person1.equals(person2)); + } + + @Test + public void givenSameNameAndAddress_whenHashCode_thenPersonsEqual() { + + String name = "John Doe"; + String address = "100 Linda Ln."; + + Person person1 = new Person(name, address); + Person person2 = new Person(name, address); + + assertEquals(person1.hashCode(), person2.hashCode()); + } + + @Test + public void givenDifferentObject_whenHashCode_thenNotEqual() { + + Person person = new Person("John Doe", "100 Linda Ln."); + + assertNotEquals(person.hashCode(), new Object().hashCode()); + } + + @Test + public void givenDifferentName_whenHashCode_thenPersonsNotEqual() { + + String address = "100 Linda Ln."; + + Person person1 = new Person("Jane Doe", address); + Person person2 = new Person("John Doe", address); + + assertNotEquals(person1.hashCode(), person2.hashCode()); + } + + @Test + public void givenDifferentAddress_whenHashCode_thenPersonsNotEqual() { + + String name = "John Doe"; + + Person person1 = new Person(name, "100 Linda Ln."); + Person person2 = new Person(name, "200 London Ave."); + + assertNotEquals(person1.hashCode(), person2.hashCode()); + } + + @Test + public void givenValidNameAndAddress_whenGetNameAndAddress_thenExpectedValuesReturned() { + + String name = "John Doe"; + String address = "100 Linda Ln."; + + Person person = new Person(name, address); + + assertEquals(name, person.name()); + assertEquals(address, person.address()); + } + + @Test + public void givenValidNameAndAddress_whenToString_thenCorrectStringReturned() { + + String name = "John Doe"; + String address = "100 Linda Ln."; + + Person person = new Person(name, address); + + assertEquals("Person[name=" + name + ", address=" + address + "]", person.toString()); + } + + @Test(expected = NullPointerException.class) + public void givenNullName_whenConstruct_thenErrorThrown() { + new Person(null, "100 Linda Ln."); + } + + @Test(expected = NullPointerException.class) + public void givenNullAddress_whenConstruct_thenErrorThrown() { + new Person("John Doe", null); + } + + @Test + public void givenUnknownAddress_whenConstructing_thenAddressPopulated() { + + String name = "John Doe"; + + Person person = new Person(name); + + assertEquals(name, person.name()); + assertEquals(Person.UNKWOWN_ADDRESS, person.address()); + } + + @Test + public void givenUnnamed_whenConstructingThroughFactory_thenNamePopulated() { + + String address = "100 Linda Ln."; + + Person person = Person.unnamed(address); + + assertEquals(Person.UNNAMED, person.name()); + assertEquals(address, person.address()); + } +}