【设计模式】建造者模式 ( 简介 | 适用场景 | 优缺点 | 代码示例 )(二)

package builder;
/**
 * 教师类 , 负责使用建造者创建学生信息
 */
public class Teacher {
    /**
     * 持有学生建造者
     */
    private StudentBuilder studentBuilder;
    /**
     * 构造函数注入建造者
     * @param studentBuilder
     */
    public Teacher(StudentBuilder studentBuilder) {
        this.studentBuilder = studentBuilder;
    }
    /**
     * 调用建造者对象创建 学生 实例对象
     * @param name
     * @param age
     * @param number
     * @param address
     * @param school
     * @return
     */
    public Student makeStudent(String name, String age,
                               String number, String address,
                               String school) {
        this.studentBuilder.buildName(name);
        this.studentBuilder.buildAge(age);
        this.studentBuilder.buildNumber(number);
        this.studentBuilder.buildAddress(address);
        this.studentBuilder.buildSchool(school);
        return this.studentBuilder.makeCourse();
    }
}

public class Main {
    public static void main(String[] args) {
        // 创建学生对象建造者
        StudentBuilder studentBuilder = new StudentBuilderImpl();
        // 创建教师对象
        Teacher teacher = new Teacher(studentBuilder);
        // 教师对象使用学生建造者创建学生 实例对象
        Student student = teacher.makeStudent(
                "小明",
                "12" ,
                "1",
                "学院路",
                "第一小学");
        System.out.println(student);
    }
}

Student{name='小明', age='12', number='1', address='学院路', school='第一小学'}

/**
 * 学生类
 */
public class Student {
    private String name;
    private String age;
    private String number;
    private String address;
    private String school;
    public Student(StudentBuilder builder) {
        this.name = builder.name;
        this.age = builder.age;
        this.number = builder.number;
        this.address = builder.address;
        this.school = builder.school;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    public String getNumber() {
        return number;
    }
    public void setNumber(String number) {
        this.number = number;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public String getSchool() {
        return school;
    }
    public void setSchool(String school) {
        this.school = school;
    }
    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age='" + age + '\'' +
                ", number='" + number + '\'' +
                ", address='" + address + '\'' +
                ", school='" + school + '\'' +
                '}';
    }
    /**
     * 使用静态内部类作为创建者
     *      将具体的业务类 及其 创建者 定义在一个类中
     * 使用链式调用 , 每个 build 步骤都返回创建者本身
     */
    public static class StudentBuilder {
        private String name;
        private String age;
        private String number;
        private String address;
        private String school;
        public StudentBuilder buildName(String name) {
            this.name = name;
            return this;
        }
        public StudentBuilder buildAge(String age) {
            this.age = age;
            return this;
        }
        public StudentBuilder buildNumber(String number) {
            this.number = number;
            return this;
        }
        public StudentBuilder buildAddress(String address) {
            this.address = address;
            return this;
        }
        public StudentBuilder buildSchool(String school) {
            this.school = school;
            return this;
        }
        public Student build() {
            return new Student(this);
        }
    }
}

package builder2;
public class Main {
    public static void main(String[] args) {
        // 使用链式调用 , 一行代码创建实例对象
        Student student = new Student.StudentBuilder()
                .buildName("小明")
                .buildAge("12")
                .buildNumber("1")
                .buildAddress("学院路")
                .buildSchool("第一小学")
                .build();
        System.out.println(student);
    }
}

Student{name='小明', age='12', number='1', address='学院路', school='第一小学'}