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[BAEL-4281] Examples of array comparisons

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Joao Esperancinha 2020-06-30 15:52:17 +02:00 committed by jofisaes@gmail.com
parent 6c921b3558
commit d1a9ff7480
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java-collections/README.md Normal file
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## Java Collections Examples
This module support code for articles about handling java collections and arrays.
### Relevant Articles:
- [Comparing two integer arrays in Java](https://stackoverflow.com/questions/14897366/comparing-two-integer-arrays-in-java)
- [Compare two arrays with not the same order](https://stackoverflow.com/questions/54711228/compare-two-arrays-with-not-the-same-order)
- More articles: [[next -->]](../java-collections-conversions-2)

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java-collections/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>java-collections</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>java-collections</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-java</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-all</artifactId>
<version>${hamcrest-all.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>java-collections</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
<properties>
<commons-collections4.version>4.1</commons-collections4.version>
</properties>
</project>

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java-collections/src/main/java/com/baeldung/comparingarrays/Plane.java Normal file
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package com.baeldung.comparingarrays;
import java.util.Objects;
public class Plane {
private final String name;
private final String model;
public Plane(String name, String model) {
this.name = name;
this.model = model;
}
public String getName() {
return name;
}
public String getModel() {
return model;
}
@Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
Plane plane = (Plane) o;
return Objects.equals(name, plane.name) && Objects.equals(model, plane.model);
}
@Override
public int hashCode() {
return Objects.hash(name, model);
}
}

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java-collections/src/main/resources/logback.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

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java-collections/src/test/java/com/baeldung/DeepEqualsCompareUnitTest.java Normal file
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package com.baeldung;
import com.baeldung.comparingarrays.Plane;
import org.junit.jupiter.api.Test;
import java.util.Arrays;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
public class DeepEqualsCompareUnitTest {
@Test
public void givenArray1andArray2_whenSameContent_thenDeepEquals() {
final Plane[][] planes1 = new Plane[][] { new Plane[] { new Plane("Plane 1", "A320") },
new Plane[] { new Plane("Plane 2", "B738") } };
final Plane[][] planes2 = new Plane[][] { new Plane[] { new Plane("Plane 1", "A320") },
new Plane[] { new Plane("Plane 2", "B738") } };
boolean result = Arrays.deepEquals(planes1, planes2);
assertTrue("Result is not true", result);
}
@Test
public void givenArray1andArray2_whenNotSameContent_thenNotDeepEquals() {
final Plane[][] planes1 = new Plane[][] { new Plane[] { new Plane("Plane 1", "A320") },
new Plane[] { new Plane("Plane 2", "B738") } };
final Plane[][] planes2 = new Plane[][] { new Plane[] { new Plane("Plane 2", "B738") },
new Plane[] { new Plane("Plane 1", "A320") } };
boolean result = Arrays.deepEquals(planes1, planes2);
assertFalse("Result is true", result);
}
}

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java-collections/src/test/java/com/baeldung/EqualsCompareUnitTest.java Normal file
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package com.baeldung;
import org.junit.jupiter.api.Test;
import java.util.Arrays;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
public class EqualsCompareUnitTest {
@Test
public void givenArray1andArray2_whenSameContent_thenEquals() {
final String[] planes1 = new String[] { "A320", "B738", "A321", "A319", "B77W", "B737", "A333", "A332" };
final String[] planes2 = new String[] { "A320", "B738", "A321", "A319", "B77W", "B737", "A333", "A332" };
boolean result = Arrays.equals(planes1, planes2);
assertTrue("Result is not true", result);
}
@Test
public void givenArray1andArray2_whenSameContentOtherSort_thenNotEquals() {
final String[] planes1 = new String[] { "A320", "B738", "A321", "A319", "B77W", "B737", "A333", "A332" };
final String[] planes2 = new String[] { "B738", "A320", "A321", "A319", "B77W", "B737", "A333", "A332" };
boolean result = Arrays.equals(planes1, planes2);
assertFalse("Result is true", result);
}
}

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java-collections/src/test/java/com/baeldung/LengthsCompareUnitTest.java Normal file
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package com.baeldung;
import org.junit.jupiter.api.Test;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.collection.IsArrayWithSize.arrayWithSize;
import static org.junit.Assert.assertThat;
public class LengthsCompareUnitTest {
@Test
public void givenArray1andArray2_whenSameSizes_thenSizeEqualsOk() {
final String[] planes1 = new String[] { "A320", "B738", "A321", "A319", "B77W", "B737", "A333", "A332" };
final Integer[] quantities = new Integer[] { 10, 12, 34, 45, 12, 43, 5, 2 };
assertThat(planes1, arrayWithSize(8));
assertThat(quantities, arrayWithSize(8));
assertThat(planes1.length, is(8));
assertThat(quantities.length, is(8));
}
}

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java-collections/src/test/java/com/baeldung/OrderCompareUnitTest.java Normal file
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package com.baeldung;
import com.baeldung.comparingarrays.Plane;
import org.junit.jupiter.api.Test;
import java.util.Arrays;
import java.util.Comparator;
import static org.junit.Assert.assertTrue;
public class OrderCompareUnitTest {
@Test
public void givenArray1andArray2_whenNotSameContent_thenNotDeepEquals() {
final Plane[][] planes1 = new Plane[][] {
new Plane[] { new Plane("Plane 1", "A320"), new Plane("Plane 2", "B738") } };
final Plane[][] planes2 = new Plane[][] {
new Plane[] { new Plane("Plane 2", "B738"), new Plane("Plane 1", "A320") } };
Comparator<Plane> planeComparator = (o1, o2) -> {
if (o1.getName()
.equals(o2.getName())) {
return o2.getModel()
.compareTo(o1.getModel());
}
return o2.getName()
.compareTo(o1.getName());
};
Arrays.sort(planes1[0], planeComparator);
Arrays.sort(planes2[0], planeComparator);
boolean result = Arrays.deepEquals(planes1, planes2);
assertTrue("Result is false", result);
}
}

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java-collections/src/test/java/com/baeldung/ReferenceCompareUnitTest.java Normal file
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package com.baeldung;
import org.junit.jupiter.api.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertNotSame;
import static org.junit.Assert.assertSame;
public class ReferenceCompareUnitTest {
@Test
public void givenArray1andArray2_whenEquals_thenEqual() {
final String[] planes1 = new String[] { "A320", "B738", "A321", "A319", "B77W", "B737", "A333", "A332" };
final String[] planes2 = planes1;
assertSame("Objects are not equal!", planes1, planes2);
planes2[0] = "747";
assertSame("Objects are not same!", planes1, planes2);
assertEquals("Objects are not equal!", "747", planes2[0]);
assertEquals("Objects are not equal!", "747", planes1[0]);
}
@Test
public void givenArray1andArray2_whenDifferentValues_thenNotEqual() {
final String[] planes1 = new String[] { "A320", "B738", "A321", "A319", "B77W", "B737", "A333", "A332" };
final String[] planes2 = new String[] { "A320", "B738", "A321", "A319", "B77W", "B737", "A333", "A332" };
assertNotSame("Objects are the same!", planes1, planes2);
assertNotEquals("Objects are equal!", planes1, planes2);
}
}