@Data和@Getter与@Setter区别

Lombok插件安装

@Data和@Getter与@Setter都是lombok插件的注解，用于简单对象的增强编译实现。

maven pom引入文件

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.8</version>
</dependency>

@Getter @Setter 使用效果

源码参考：

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

编译后再反编译查看：

public class Student {
    public String name;
    public int age;
 
    public Student() {
    }
 
    public String getName() {
        return this.name;
    }
 
    public int getAge() {
        return this.age;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public void setAge(int age) {
        this.age = age;
    }
}

可以看到@Getter和@Setter仅对对象的属性进行了get set方法填充

@Data效果

源码：

@Data
public class Student {
   public String name;
   public int age;
}

编译后：

public class Student {
    public String name;
    public int age;
 
    public Student() {
    }
 
    public String getName() {
        return this.name;
    }
 
    public int getAge() {
        return this.age;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public void setAge(int age) {
        this.age = age;
    }
 
    public boolean equals(Object o) {
        if (o == this) {
            return true;
        } else if (!(o instanceof Student)) {
            return false;
        } else {
            Student other = (Student)o;
            if (!other.canEqual(this)) {
                return false;
            } else {
                Object this$name = this.getName();
                Object other$name = other.getName();
                if (this$name == null) {
                    if (other$name == null) {
                        return this.getAge() == other.getAge();
                    }
                } else if (this$name.equals(other$name)) {
                    return this.getAge() == other.getAge();
                }
 
                return false;
            }
        }
    }
 
    protected boolean canEqual(Object other) {
        return other instanceof Student;
    }
 
    public int hashCode() {
        int PRIME = true;
        int result = 1;
        Object $name = this.getName();
        int result = result * 59 + ($name == null ? 43 : $name.hashCode());
        result = result * 59 + this.getAge();
        return result;
    }
 
    public String toString() {
        return "Student(name=" + this.getName() + ", age=" + this.getAge() + ")";
    }
}

可以看到@Data不仅包括了@Setter和@Getter的部分，还增强实现了toString hashCode canEqual equals 方法

lombok @Data @Getter @Setter

http://blog.xqlee.com/article/2504011439221096.html