链式调用Builder

Posted 2021-02-12 q1359720840

使用Lombok实现链式调用

1.静态调用

User对象: 对象中必须有一个值不为空staticname作为指定的参数并调用对象

@Accessors(chain = true)
@Getter
@Setter
@RequiredArgsConstructor(staticName  = "of")
@ToString
public class User {
private  Integer id;
    @NonNull
private  String username;
private  String password;
private  String  remarks;
private  String true_name;
}

main调用：

   public static void main(String[] args) throws IOException {
        User user = User.of("张三")
                .setPassword("zhangsan123")
                .setTrue_name("zhangsaniii");
        System.out.println(user);}

控制台输出：

User(id=null, username=张三, password=zhangsan123, remarks=null, true_name=zhangsaniii)

2.第二张创建方式

user对象

import lombok.*;

@Data
@Builder//链式调用<--
@RequiredArgsConstructor
@AllArgsConstructor
@ToString
public class User {
private  Integer id;
private  String username;
private  String password;
private  String  remarks;
private  String true_name;
}

测试main

  User build = User.builder().
                username("zhangsan").id(2).
                password("123").build();
        System.out.println(build);

输出：

User(id=2, username=zhangsan, password=123, remarks=null, true_name=null)