Java? ?? getter, setter, ??? ? toString ???? ?? ???? ??? ??? ??? ? ??? ??? ??? ????. ????? ??? ??? ???? ?? ?? ??? ???? ??? ?? ?? ????? ? ???? ? ????. Project Lombok? ??? ??? ??? ??? ???? ???? ? ??? ?????.

? ?????? Lombok? Java? ?? ??? ??? ?? ???? ??? ?? ??? ????, Lombok? ?? ??? ???? Java Abstract? ???? ???? ??? ???? ?? ?? ??? ???????. ?? ??(AST)? ???? ??? ???? ?? ??? ???? ?? ? ????.

? ??? ??????

Java?? ??? ?? ??? ??? ?????. ??, ???, getter, setter ? toString ???? ???? ??? POJO? ??? ???.

public class User {
    private String name;
    private int age;

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{name='" + name + "', age=" + age + '}';
    }
}

??? ??????? ??? ????? ?????? ??? ??? ???? ?? ?????? ? ????.

???: ??

Lombok? ???? ??? ???? ??? ?? ?? ? ????. Lombok? ??? ??? ???? ??? ??? ????.

import lombok.Data;

@Data
public class User {
    private String name;
    private int age;
}

? ??? ???? Lombok? getter, setter, toString, equals ? hashCode ???? ???? ??? ? ???? ?? ???? ?? ????.

??? ???? ??

1??: Lombok ??? ??

Maven ?????? Lombok? ????? pom.xml? ?? ???? ?????.

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.28</version>
    <scope>provided</scope>
</dependency>

Gradle? ??:

compileOnly 'org.projectlombok:lombok:1.18.28'
annotationProcessor 'org.projectlombok:lombok:1.18.28'

2??: IDE ??

IDE? Lombok ????? ???? ??? ?????. IntelliJ IDEA??:

1.  Go to Settings > Plugins.
2.  Search for Lombok.
3.  Install the Lombok plugin.
4.  Enable annotation processing under Settings > Build, Execution, Deployment > Compiler > Annotation Processors.

?? ?? ??: ???? ???

?? ??? ?

Lombok? Java Annotation Processor? ???? Java Abstract Syntax Tree(AST)? ???????. ?? ????? ??? ???? ?? ?? ??? ???? ????? ?????. Lombok? ?? ????? ?? ???? ??? ????? ?? getter, setter ? toString? ?? ???? AST? ?? ???? ?????.

?? ?? ??(AST) ??

AST? ??? ?? ????, ??? ????? ??? ? ?? ???? ??? ?????. Java ??? ??? ? ? ??(?: ???, ??, ???)? AST? ??? ?????.

Lombok? ?? ????? Lombok ??? ?? ???? ???? AST ??? ???? ??? ?? ???? ?????. ?? ??? ???? ??? ?? ???? ?? ??? ??? ???? ?? ?????. ??? ???? ??? ??? ?? ???? ???? ???? ?????.

???: Lombok? ??? ???? ??? ??

Lombok? ??? Java ?? ?? ?? ??? ????? ?? ??? ??? ???? ?????. ??? ????? ??? ????.

public class User {
    private String name;
    private int age;

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{name='" + name + "', age=" + age + '}';
    }
}

????? ??? ???? getter, setter ? ?? ???? ??? ??? ??????? ???? ?? ?? ??? ??? ??? ?????.

?? ?? ??

• @Getter ? @Setter

??? ??? ??? ?? getter ? setter ???? ???? ?? ???? ??? ????? ?????.

import lombok.Data;

@Data
public class User {
    private String name;
    private int age;
}

• @ToString

@ToString? ?? ??? ???? ??? ?? ????? ?? ??? ???? toString ???? ?????.

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.28</version>
    <scope>provided</scope>
</dependency>

• @EqualsAndHashCode

equals ? hashCode ???? ?????. ??? ??? ??? ???? HashMap ?? HashSet? ?? ????? ???? ? ??????.

compileOnly 'org.projectlombok:lombok:1.18.28'
annotationProcessor 'org.projectlombok:lombok:1.18.28'

• @NoArgsConstructor, @AllArgsConstructor ? @RequiredArgsConstructor

??? ??? ??? ???? ??? ???? ???? ?????.

1.  Go to Settings > Plugins.
2.  Search for Lombok.
3.  Install the Lombok plugin.
4.  Enable annotation processing under Settings > Build, Execution, Deployment > Compiler > Annotation Processors.

1.  AST Creation: The compiler reads the Java source code and generates the AST.
2.  Annotation Processing: Lombok’s annotation processor scans the AST for Lombok annotations.
3.  AST Manipulation: When an annotation like @Getter or @Setter is found, Lombok adds nodes to the AST to represent the corresponding methods.
4.  Bytecode Generation: The modified AST is used to generate the final bytecode, which includes the methods added by Lombok.

• @???

@Getter, @Setter, @ToString, @EqualsAndHashCode ? @RequiredArgsConstructor? ?????.

import lombok.Getter;
import lombok.Setter;

@Getter
@Setter
public class User {
    private String name;
    private int age;
}

• @??

?? ????? ???? ??? ??? ???? ? ?? ??? ?? ??? ?????.

import lombok.ToString;

@ToString(exclude = ?password“)
public class User {
    private String name;
    private int age;
    private String password;
}

???:

import lombok.EqualsAndHashCode;

@EqualsAndHashCode
public class User {
    private String name;
    private int age;
}

• @Slf4j(??)

SLF4J Logger ????? ???? ?? ??? ??????.

? @NoArgsConstructor: No-argument constructor.
? @AllArgsConstructor: Constructor with parameters for all fields.
? @RequiredArgsConstructor: Constructor for fields marked final or @NonNull.

Spring Boot ??????? Lombok

Lombok? ??? ??? ??? ???, ??? ? ??? ?? ??? ? ?? Spring Boot ??????? ?? ?????. ??? Spring Boot ????? Lombok? ???? ????.

import lombok.NoArgsConstructor;
import lombok.AllArgsConstructor;
import lombok.RequiredArgsConstructor;

@NoArgsConstructor
@AllArgsConstructor
@RequiredArgsConstructor
public class User {
    private final String name;
    private int age;
}

? ????:

import lombok.Data;

@Data
public class User {
    private String name;
    private int age;
}

??

Lombok? Java ????? ??? ?????. ??? ??? ?? ??? ???? ???? ???? ???? ??????. ?? ??? ???? AST? ?????? Lombok? ??? ?? ???? ?? ???? ?? ?? ?? ?? ???? ?????.

Spring Boot? ???? Lombok? ??? ?? ??????. @Data, @Builder ? @Slf4j? ?? ??? ?? ? ???? ?? ???? ?? ??? ??? ??? ???? ??? ??? ?????.

Java? ???? ?? Lombok? ??? ? ??? ???. Lombok? ??? ? ??? ? ?? ???? ? ?? ??? ??????

? ??? Project Lombok?? Java ??: ?? ???, ??? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!