EQUALSVERIFIER | Release Normal Jar framework in the Java library

EQUALSVERIFIER is a framework for Java libraries to verify whether the implementation of Equals and Hashcode methods is correct.This guide will introduce the steps that use the Equalsverifier framework in the Java library and provide the corresponding Java code example. 1. Introduce Equalsverifier framework Before the beginning, the dependencies of Equalsverifier need to be added to the project construction file (such as pom.xml).For example, the following code fragment can be added in Maven: <dependency> <groupId>nl.jqno.equalsverifier</groupId> <artifactId>equalsverifier</artifactId> <version>3.6.5</version> <scope>test</scope> </dependency> 2. Define the Java class that needs to be verified Suppose we have a Java class called Person, which has two attributes: name and Age.We need to verify the correct implementation of the Equals and HashCode methods of this class. public class Person { private String name; private int age; // constructor, getters, and setters @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null || getClass() != obj.getClass()) { return false; } Person other = (Person) obj; return Objects.equals(name, other.name) && age == other.age; } @Override public int hashCode() { return Objects.hash(name, age); } } 3. Use EQUALSVERIFIER verification We can use the EQUALSVERIFIER framework to verify the correctness of the Equals and HashCode methods we defined.The following is an example code using EqualSverifier: import nl.jqno.equalsverifier.EqualsVerifier; import org.junit.Test; public class PersonTest { @Test public void testEqualsHashCode() { EqualsVerifier.forClass(Person.class).verify(); } } In the above example, we use the equalsverifier.Forclass () method in the test method to specify the class to be verified and perform the verification operation through the Verify () method. 4. Run verification test Now, we can run the test claim containing the verification code.If the Equals and HashCode methods are implemented correctly, the test should pass, otherwise the abnormalities will be thrown and the error message will be displayed. After verification, we can ensure that the Equals and HashCode methods are correct to the Person class.This will help avoid problems when using a collection class (such as HashMap, HashSet, etc.). Summarize: EQUALSVERIFIER is a convenient framework that can be used to verify the correctness of the Equals and Hashcode methods of the Java class.By following the guide in this article, you can easily use Equalsverifier and ensure that the objects in the code are more logical. Please note that this guide only covers the basic usage of the Equalsverifier framework.You can check the official documentation of Equalsverifier to learn more advanced usage and configuration options.