建造者模式

目录

一、介绍

二、示例

---

一、介绍

建造者模式是日常开发中比较常见的设计模式，它的主要作用就是将复杂事物创建的过程抽象出来，该
抽象的不同实现方式不同，创建出的对象也不同。
通俗的讲，创建一个对象一般都会有一个固定的步骤，这个固定的步骤我们把它抽象出来，每个抽象步骤都会有不同的实现方式，不同的实现方式创建出的对象也将不同

二、示例

package com.example.designmode.demo.builder;


public class Student {

    private String name;

    private Integer age;

    private Integer sex;

    private String phone;


    public static final class Builder {
        private String name;
        private Integer age;
        private Integer sex;
        private String phone;

        public Builder() {
        }

        public static Builder aStudent() {
            return new Builder();
        }

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

        public Builder withAge(Integer age) {
            this.age = age;
            return this;
        }

        public Builder withSex(Integer sex) {
            this.sex = sex;
            return this;
        }

        public Builder withPhone(String phone) {
            this.phone = phone;
            return this;
        }

        public Student build() {
            Student student = new Student();
            student.name = this.name;
            student.sex = this.sex;
            student.age = this.age;
            student.phone = this.phone;
            return student;
        }
    }
}

package com.example.designmode.demo.builder;


public class Test {

    public static void main(String[] args) {
        Student build = new Student.Builder().withName("123").withAge(18).build();
        System.out.println(build.toString());
    }
}