Lombok添加类注解@Data自动在class中生成setter，getter等方法

た入场券 2023-07-01 12:54 50阅读 0赞

在没有lombok之前都是手写setter，getter，后来又了IDE之后能快捷键自动生成Setter，Getter等方法，

那么现在有了lombok之后，只需添加类注解@Data，那么常用的类方法都给生成了，下面来上例子哈~~~

# 环境： #

## IDEA: ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pwMzU3MjUyNTM5_size_16_color_FFFFFF_t_70][]

## JDK： ##

![20200122094156539.png][]

# 没有添加@Data的注解的类\[User.java\] #

package com.esoon.ids.model;
    
    
    public class User {
        private String name;
        private int age;
        private String pass;
    
    }

# 没有添加@Data的注解的类\[User.java\]生成的Class文件反编译之后的结果 #

# 添加@Data的注解的类\[User.java\] #

package com.esoon.ids.model;
    
    import lombok.Data;
    
    @Data
    public class User {
        private String name;
        private int age;
        private String pass;
    
    }

# lombok我用的maven依赖是： #

<properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
            <lombok.version>1.16.18</lombok.version>
        </properties>
    ...................
    <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
                <scope>provided</scope>
            </dependency>

# 添加@Data的注解的类\[User.java\]生成的Class文件反编译之后的结果 #

//
    // Source code recreated from a .class file by IntelliJ IDEA
    // (powered by Fernflower decompiler)
    //
    
    package com.esoon.ids.model;
    
    public class User {
        private String name;
        private int age;
        private String pass;
    
        public User() {
        }
    
        public String getName() {
            return this.name;
        }
    
        public int getAge() {
            return this.age;
        }
    
        public String getPass() {
            return this.pass;
        }
    
        public void setName(final String name) {
            this.name = name;
        }
    
        public void setAge(final int age) {
            this.age = age;
        }
    
        public void setPass(final String pass) {
            this.pass = pass;
        }
    
        public boolean equals(final Object o) {
            if (o == this) {
                return true;
            } else if (!(o instanceof User)) {
                return false;
            } else {
                User other = (User)o;
                if (!other.canEqual(this)) {
                    return false;
                } else {
                    label39: {
                        Object this$name = this.getName();
                        Object other$name = other.getName();
                        if (this$name == null) {
                            if (other$name == null) {
                                break label39;
                            }
                        } else if (this$name.equals(other$name)) {
                            break label39;
                        }
    
                        return false;
                    }
    
                    if (this.getAge() != other.getAge()) {
                        return false;
                    } else {
                        Object this$pass = this.getPass();
                        Object other$pass = other.getPass();
                        if (this$pass == null) {
                            if (other$pass != null) {
                                return false;
                            }
                        } else if (!this$pass.equals(other$pass)) {
                            return false;
                        }
    
                        return true;
                    }
                }
            }
        }
    
        protected boolean canEqual(final Object other) {
            return other instanceof User;
        }
    
        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();
            Object $pass = this.getPass();
            result = result * 59 + ($pass == null ? 43 : $pass.hashCode());
            return result;
        }
    
        public String toString() {
            return "User(name=" + this.getName() + ", age=" + this.getAge() + ", pass=" + this.getPass() + ")";
        }
    }

# 总结 #

可以看到，除了Setter,Getter之外，还自动实现了toString(),hashCode(),equals(),canEqual（）,当然你也可以根据需要自动实现不合适的部分。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pwMzU3MjUyNTM5_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200122094040153.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pwMzU3MjUyNTM5,size_16,color_FFFFFF,t_70
[20200122094156539.png]: https://img-blog.csdnimg.cn/20200122094156539.png