@Data

public class Student {

    //体检用

    private String name;

    private int age;

    private int height;

    private int sex;

    //录取用

    private String schoolName;

    private String profession;

    private int gradeNo;

    //分班用

    private String idCard;

    private String stuNo;

    private String labName;

    private String dormitoryAddress;

    private Student(Builder builder) {

        this.name = builder.name;

        this.age = builder.age;

        this.height = builder.height;

        this.sex = builder.sex;

        this.schoolName = builder.schoolName;

        this.profession = builder.profession;

        this.gradeNo = builder.gradeNo;

        this.idCard = builder.idCard;

        this.stuNo = builder.stuNo;

        this.labName = builder.labName;

        this.dormitoryAddress = builder.dormitoryAddress;

    }

    public static class Builder{

        //体检用 公用的用final

        private final String name;

        private final int age;

        private final int height;

        private final int sex;

        //录取用

        private String schoolName;

        private String profession;

        private int gradeNo;

        //分班用

        private String idCard;

        private String stuNo;

        private String labName;

        private String dormitoryAddress;

        public Builder(String name, int age, int height, int sex) {

            this.name = name;

            this.age = age;

            this.height = height;

            this.sex = sex ;

        }

        public Builder schoolName(String schoolName) {

            this.schoolName = schoolName;

            return this;

        }

        public Builder profession(String profession) {

            this.profession = profession;

            return this;

        }

        public Builder gradeNo(int gradeNo) {

            this.gradeNo = gradeNo;

            return this;

        }

        public Builder idCard (String idCard) {

            this.idCard = idCard;

            return  this;

        }

        public  Builder stuNo(String stuNo) {

            this.stuNo = stuNo;

            return this;

        }

        public Builder labName(String labName) {

            this.labName = labName;

            return  this;

        }

        public Builder dormitoryAddress(String dormitoryAddress) {

            this.dormitoryAddress = dormitoryAddress;

            return this;

        }

        public Student build() {

            return new Student(this);

        }

    }

    //测试

    public static void main(String[] args) {

        //各取所需，公用的字段写成Builder的构造方法中！

        Student zhangsan = new Student.Builder("zhangsan", 28, 168, 0).build(); //体检的张三只要四个基本参数

        Student zhangsan1 = new Builder("zhangsan", 28, 168, 0).schoolName("安徽大学").profession("国贸").build(); // 录取学生信息管理系统要的字段

        Student zhangsan2  = new Student.Builder("zhangsan", 28, 168, 0).schoolName("安徽大学").profession("国贸").stuNo("学号04012057")

                            .gradeNo(302).dormitoryAddress("寝室号502").build();

        System.out.println("张三的体检信息：" + zhangsan);

        System.out.println("张三被录取后信息：" + zhangsan1);

        System.out.println("张三分班后：" + zhangsan2);

    }

}

张三的体检信息：Student(name=zhangsan, age=28, height=168, sex=0, schoolName=null, profession=null, gradeNo=0, idCard=null, stuNo=null, labName=null, dormitoryAddress=null)

张三被录取后信息：Student(name=zhangsan, age=28, height=168, sex=0, schoolName=安徽大学, profession=国贸, gradeNo=0, idCard=null, stuNo=null, labName=null, dormitoryAddress=null)

张三分班后：Student(name=zhangsan, age=28, height=168, sex=0, schoolName=安徽大学, profession=国贸, gradeNo=302, idCard=null, stuNo=学号04012057, labName=null, dormitoryAddress=寝室号502)