lombok 實現 builder模式的鏈式bean

package com.wing.mall.base.test;

import lombok.*;
import lombok.experimental.Accessors;

import java.io.Serializable;

/**
 * @ProjectName: baby
 * @Package: com.wing.mall.base.test
 * @ClassName: User
 * @Author: heluwei
 * @Description: 鏈式操作對象
 * @Date: 2020/4/14 18:28
 * @Version: 1.0
 */
@Builder
@Data
public class User implements Serializable {
    private Long id;
    private String name;
    private Integer age;

    public static void main(String[] args) {
        //鏈式創建對象
        User user = User.builder().id(1L).name("張三").age(18).builder(); 
　　　　　　System.out.println(user); 
　　　　　　//獲取name的值,以前是getName() 
 　　　　　System.out.println(user.name); 
　　} 
}

 通過Builder的方式鏈式組裝

package com.wing.mall.base.test;

import lombok.*;

import java.io.Serializable;

/**
 * @ProjectName: baby
 * @Package: com.wing.mall.base.test
 * @ClassName: User
 * @Author: heluwei
 * @Description: 鏈式操作對象
 * @Date: 2020/4/14 18:28
 * @Version: 1.0
 */
@Data
public class User implements Serializable {
    private Long id;
    private String name;
    private Integer age;
    
    //通過Builder把值通過構造器的方式傳遞
    public User(Builder builder) {
        this.id = builder.id;
        this.name = builder.name;
        this.age = builder.age;
    }

    @Getter
    static class Builder{
        private Long id;
        private String name;
        private Integer age;

        public Builder setId(Long id) {
            this.id = id;
            return this;
        }

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

        public Builder setAge(Integer age) {
            this.age = age;
            return this;
        }
        public User builder(){
            return new User(this);
        }
    }

    public static void main(String[] args) {
        User user = new User.Builder().setId(1L).setName("張三").setAge(18).builder();
        System.out.println(user);
    }
}

輸出結果：

 

使用@Builder注解和構造器

package com.wing.mall.cloud.pay.modular.controller;

import lombok.*;

@Data
@Builder
@NoArgsConstructor   //生成無參構造器
@AllArgsConstructor  //生成所有參數的構造器
public class Student {

    private String name;
    private Integer age;

}

測試：

public static void main(String[] args) {
        Student student = Student.builder().age(18).build();
        System.out.println(student);
        Student student1 = new Student("lisi",19);
        System.out.println(student1);
        Student student2 = new Student();
        student2.setAge(20);
        student2.setName("wangwu");
        System.out.println(student2);
       /* if (shouldShowSpinner("a", "b")) {
            System.out.println("封裝參數成功");
        }else {
            System.out.println("封裝參數失敗");
        }*/
    }