用java语言实现如下题目：定义一个学生类Student，成员变量包括：姓名，生日，学号，学校；重写方法toString，equals，hashCode；实现接口Comparable，按照学号大小进行比较；定义构造方法。 代码形式如下： public class Main{ public static void main(String[] args) { Scanner in=new Scanner(System.in); int num=in.nextInt(); Student[] studentArray = new Student[num]; for(int i=0;i<num;i++) { String name=in.next(); int year=in.nextInt(); int month=in.nextInt(); int day=in.nextInt(); String studentId=in.next(); String school=in.next(); studentArray[i]=new Student(name,year,month,day,studentId,school); } Arrays.sort(studentArray); for(Student s:studentArray) System.out.println(s); } } class Student implements Comparable { //给出Student的定义 }

代码如下：

import java.util.Arrays;
import java.util.Date;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);
        int num=in.nextInt();
        Student[] studentArray = new Student[num];
        for(int i=0;i<num;i++) {
            String name=in.next();
            int year=in.nextInt();
            int month=in.nextInt();
            int day=in.nextInt();
            String studentId=in.next();
            String school=in.next();
            studentArray[i]=new Student(name,year,month,day,studentId,school);
        }

        Arrays.sort(studentArray);
        for(Student s:studentArray)
            System.out.println(s);
    }
}

class Student implements Comparable<Student> {
    private String name;
    private Date birthday;
    private String studentId;
    private String school;

    public Student(String name, int year, int month, int day, String studentId, String school) {
        this.name = name;
        this.birthday = new Date(year - 1900, month - 1, day);
        this.studentId = studentId;
        this.school = school;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", birthday=" + birthday +
                ", studentId='" + studentId + '\'' +
                ", school='" + school + '\'' +
                '}';
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof Student)) return false;
        Student student = (Student) o;
        return studentId.equals(student.studentId);
    }

    @Override
    public int hashCode() {
        return studentId.hashCode();
    }

    @Override
    public int compareTo(Student o) {
        return this.studentId.compareTo(o.studentId);
    }
}

注：上述代码中，我们使用了 `java.util.Date` 类来表示学生的生日，并在 `Student` 构造函数中将输入的年月日转换为 `Date` 类型。同时，我们重写了 `equals` 和 `hashCode` 方法，以确保在使用 `HashSet` 或 `HashMap` 等容器时，能够正确判断学生对象是否相等。