Project Lombok is a Java library that helps reduce boilerplate code by automatically generating commonly used methods and annotations. It provides annotations that can simplify and reduce the verbosity of your Java classes, making your code more readable and maintainable.
Reduce Boilerplate Code:
Improve Readability:
Maintainability:
Consistent Coding Style:
Maven:
Add the Lombok dependency to your pom.xml file:
<dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.22</version> <scope>provided</scope> </dependency>
Gradle:
Add the Lombok dependency to your build.gradle file:
dependencies { compileOnly 'org.projectlombok:lombok:1.18.22' annotationProcessor 'org.projectlombok:lombok:1.18.22' }
Most IDEs like IntelliJ IDEA and Eclipse support Lombok, but you need to install the Lombok plugin to enable it.
IntelliJ IDEA:
Eclipse:
Here are some commonly used Lombok annotations:
@Getter and @ Setter:
Generates getter and setter methods for the fields of your class.
import lombok.Getter; import lombok.Setter; @Getter @Setter public class User { private Long id; private String name; private String email; }
@ToString:
Generates a toString() method for your class.
import lombok.ToString; @ToString public class User { private Long id; private String name; private String email; }
@EqualsAndHashCode:
Generates equals() and hashCode() methods for your class.
import lombok.EqualsAndHashCode; @EqualsAndHashCode public class User { private Long id; private String name; private String email; }
@NoArgsConstructor, @AllArgsConstructor, and @RequiredArgsConstructor:
Generates constructors for your class.
import lombok.NoArgsConstructor; import lombok.AllArgsConstructor; import lombok.RequiredArgsConstructor; @NoArgsConstructor @AllArgsConstructor @RequiredArgsConstructor public class User { private Long id; private final String name; private final String email; }
@data:
A convenient shortcut that bundles the features of @ToString, @EqualsAndHashCode, @Getter on all fields, and @Setter on all non-final fields, and @RequiredArgsConstructor.
import lombok.Data; @Data public class User { private Long id; private String name; private String email; }
Here is an example of a class before and after using Lombok:
Without Lombok:
public class User { private Long id; private String name; private String email; public User() {} public User(Long id, String name, String email) { this.id = id; this.name = name; this.email = email; } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } @Override public String toString() { return "User{" + "id=" + id + ", name='" + name + '\'' + ", email='" + email + '\'' + '}'; } @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; User user = (User) o; return Objects.equals(id, user.id) && Objects.equals(name, user.name) && Objects.equals(email, user.email); } @Override public int hashCode() { return Objects.hash(id, name, email); } }
With Lombok:
import lombok.Data; @Data public class User { private Long id; private String name; private String email; }
By integrating Lombok into your project, you can significantly simplify your code and focus more on business logic rather than writing repetitive boilerplate code.
The above is the detailed content of How to use project Lombok. For more information, please follow other related articles on the PHP Chinese website!