简介

对于 Data 注解基本理解而言就是生成 getter & setter 函数

但是经过探究
不单单有getter & setter 还有 toString方法 hashCode 方法 和 equals 方法。

原代码

import lombok.Data;

@Data
public class TestDTO {
    private Integer age;
    private String name;
}

编译后的代码

public class TestDTO {
    private Integer age;
    private String name;

    public TestDTO() {
    }

    public Integer getAge() {
        return this.age;
    }

    public String getName() {
        return this.name;
    }

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

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

    public boolean equals(final Object o) {
        if (o == this) {
            return true;
        } else if (!(o instanceof TestDTO)) {
            return false;
        } else {
            TestDTO other = (TestDTO)o;
            if (!other.canEqual(this)) {
                return false;
            } else {
                Object this$age = this.getAge();
                Object other$age = other.getAge();
                if (this$age == null) {
                    if (other$age != null) {
                        return false;
                    }
                } else if (!this$age.equals(other$age)) {
                    return false;
                }

                Object this$name = this.getName();
                Object other$name = other.getName();
                if (this$name == null) {
                    if (other$name != null) {
                        return false;
                    }
                } else if (!this$name.equals(other$name)) {
                    return false;
                }

                return true;
            }
        }
    }

    protected boolean canEqual(final Object other) {
        return other instanceof TestDTO;
    }

    public int hashCode() {
        int PRIME = true;
        int result = 1;
        Object $age = this.getAge();
        int result = result * 59 + ($age == null ? 43 : $age.hashCode());
        Object $name = this.getName();
        result = result * 59 + ($name == null ? 43 : $name.hashCode());
        return result;
    }

    public String toString() {
        return "TestDTO(age=" + this.getAge() + ", name=" + this.getName() + ")";
    }
}