Lombok中的@Builder注解怎么用

这篇文章主要介绍Lombok中的@Builder注解怎么用，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

Lombok中的@Builder注解的使用

作用

@Builder注解的作用主要是用来生成对象，并且可以为对象链式赋值。

引入依赖

因为@Builder注解是lombok中的东西，所以第一步我们需要引入lombok的依赖，如下图：

第二步给实体类加上@Builder注解

第二步我们需要给我们的实体类加上一个@Builder注解，如下图：

第三步使用测试使用@Builder注解生成对象

实体类加上@Builder注解之后的编译结果

实体类加上@Builder注解之后，编译之后会多出一个builder()方法，和一个CardBuilder静态内部类，如下图：

代码如下:

public class Card {    private int id;    private String name;    private boolean sex;    public static Card.CardBuilder builder() {        return new Card.CardBuilder();    }    public Card(int id, String name, boolean sex) {        this.id = id;        this.name = name;        this.sex = sex;    }    public Card() {    }    public int getId() {        return this.id;    }    public String getName() {        return this.name;    }    public boolean isSex() {        return this.sex;    }    public void setId(int id) {        this.id = id;    }    public void setName(String name) {        this.name = name;    }    public void setSex(boolean sex) {        this.sex = sex;    }    public boolean equals(Object o) {        if (o == this) {            return true;        } else if (!(o instanceof Card)) {            return false;        } else {            Card other = (Card)o;            if (!other.canEqual(this)) {                return false;            } else if (this.getId() != other.getId()) {                return false;            } else {                Object this$name = this.getName();                Object other$name = other.getName();                if (this$name == null) {                    if (other$name == null) {                        return this.isSex() == other.isSex();                    }                } else if (this$name.equals(other$name)) {                    return this.isSex() == other.isSex();                }                return false;            }        }    }    protected boolean canEqual(Object other) {        return other instanceof Card;    }    public int hashCode() {        int PRIME = true;        int result = 1;        int result = result * 59 + this.getId();        Object $name = this.getName();        result = result * 59 + ($name == null ? 43 : $name.hashCode());        result = result * 59 + (this.isSex() ? 79 : 97);        return result;    }    public String toString() {        return "Card(id=" + this.getId() + ", name=" + this.getName() + ", sex=" + this.isSex() + ")";    }    public static class CardBuilder {        private int id;        private String name;        private boolean sex;        CardBuilder() {        }        public Card.CardBuilder id(int id) {            this.id = id;            return this;        }        public Card.CardBuilder name(String name) {            this.name = name;            return this;        }        public Card.CardBuilder sex(boolean sex) {            this.sex = sex;            return this;        }        public Card build() {            return new Card(this.id, this.name, this.sex);        }        public String toString() {            return "Card.CardBuilder(id=" + this.id + ", name=" + this.name + ", sex=" + this.sex + ")";        }    }}

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