java lombok- @ Builder Notes

java lombok- @ Builder Notes

I. Introduction

In writing the code to be repeated write javaBean get, set, toString method is a no-tech and repeat things work, and more time to read, when javaBean class is also very complicated, lombok for annotations way, do not need to write these repeat code to make the code more simple and elegant.

Two, IDEA Add lombok

IDEA Add lombok link: IDEA plug-ins to add lombok 

Three, @ Builder use Description

In no time using lombok @Builder notes:

User class needs to get, set methods for each field down, and the entire class looks code bloat.

UserInfo class: user add data objects to be repeated call set methods.

• User class needs to get, set methods for each field down, and the entire class looks code bloat. 

public class User {
    private String name;
    private String comment;
    private String sex;
    private int age;

    public String getName() {
        return name;
    }

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

    public String getComment() {
        return comment;
    }

    public void setComment(String comment) {
        this.comment = comment;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public int getAge() {
        return age;
    }

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

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", comment='" + comment + '\'' +
                ", sex='" + sex + '\'' +
                ", age=" + age +
                '}';
    }
}

• UserInfo class: user add data objects to be repeated call set methods.

import java.util.ArrayList;
import java.util.List;

public class UserInfo {

    public static void main(String[] args) {

        printUser();
    }

    private static void printUser() {
        List<User> users = new ArrayList<>();
        //user对象添加属性值
        User user = new User();
        user.setName("李明");
        user.setAge(14);
        user.setSex("男");
        user.setComment("喜欢读书");

        //user对象添加到list集合
        users.add(user);
        System.out.println("User infomation::" + users);
    }
}

 Notes lombok way of writing:

User class do not need to write get, set method, the code is very simple and elegant

UserInfo class can be constructed using the Builder directly User class object and set property values

• User class do not need to write get, set method, the code is very simple and elegant 

import lombok.Builder;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

@Getter
@Setter
@ToString
@Builder
public class User {
    private String name;
    private String comment;
    private String sex;
    private int age;

}

• UserInfo class can be constructed using the Builder directly User class object and set property values

import java.util.ArrayList;
import java.util.List;

public class UserInfo {

    public static void main(String[] args) {
        printUser();
    }

    private static void printUser() {
        List<User> users = new ArrayList<>();
        //user对象添加属性值
        User user = User.builder()
                .name("李明")
                .age(16)
                .sex("男")
                .comment("喜欢读书")
                .build();

        //user对象添加到list集合
        users.add(user);
        System.out.println("User infomation::" + users);
    }
}

• Output

User infomation::[User(name=李明, comment=喜欢读书, sex=男, age=16)]