应用ArrayList实现某专业所有学生的成绩管理，要求构建学生（Student）类和成绩（AcademicRecord）类等，能够对不同年级的学生按总成绩排序并输出. Student(name,studID,major,grade, ArrayList< AcademicRecord > scores); AcademicRecord(studID,courseID,score) 要求学生类实现Comparable接口，排序按年级、成绩排； 并实现学生相同的判断（重写equals），当学生姓名和学号一样时，则学生相同。

好的，我已经理解了您的问题。下面是一个示例代码，可以实现您的需求：

import java.util.ArrayList;
import java.util.Collections;

public class Student implements Comparable<Student> {
    private String name;
    private String studID;
    private String major;
    private int grade;
    private ArrayList<AcademicRecord> scores;

    public Student(String name, String studID, String major, int grade, ArrayList<AcademicRecord> scores) {
        this.name = name;
        this.studID = studID;
        this.major = major;
        this.grade = grade;
        this.scores = scores;
    }

    public String getName() {
        return name;
    }

    public String getStudID() {
        return studID;
    }

    public String getMajor() {
        return major;
    }

    public int getGrade() {
        return grade;
    }

    public ArrayList<AcademicRecord> getScores() {
        return scores;
    }

    public void setScores(ArrayList<AcademicRecord> scores) {
        this.scores = scores;
    }

    @Override
    public int compareTo(Student student) {
        if (this.grade != student.grade) {
            return this.grade - student.grade;
        } else {
            int sumScore1 = 0, sumScore2 = 0;
            for (AcademicRecord academicRecord : this.scores) {
                sumScore1 += academicRecord.getScore();
            }
            for (AcademicRecord academicRecord : student.scores) {
                sumScore2 += academicRecord.getScore();
            }
            return sumScore2 - sumScore1;
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        Student student = (Student) o;
        return studID.equals(student.studID) && name.equals(student.name);
    }

    @Override
    public int hashCode() {
        return studID.hashCode() + name.hashCode();
    }

    public static void main(String[] args) {
        ArrayList<Student> students = new ArrayList<>();
        ArrayList<AcademicRecord> scores1 = new ArrayList<>();
        scores1.add(new AcademicRecord("1001", "math", 90));
        scores1.add(new AcademicRecord("1001", "english", 80));
        scores1.add(new AcademicRecord("1001", "chinese", 70));
        Student student1 = new Student("Tom", "1001", "Computer Science", 3, scores1);
        ArrayList<AcademicRecord> scores2 = new ArrayList<>();
        scores2.add(new AcademicRecord("1002", "math", 85));
        scores2.add(new AcademicRecord("1002", "english", 90));
        scores2.add(new AcademicRecord("1002", "chinese", 80));
        Student student2 = new Student("Jerry", "1002", "Computer Science", 3, scores2);
        ArrayList<AcademicRecord> scores3 = new ArrayList<>();
        scores3.add(new AcademicRecord("1003", "math", 95));
        scores3.add(new AcademicRecord("1003", "english", 85));
        scores3.add(new AcademicRecord("1003", "chinese", 90));
        Student student3 = new Student("Lily", "1003", "Computer Science", 2, scores3);
        students.add(student1);
        students.add(student2);
        students.add(student3);
        Collections.sort(students);
        for (Student student : students) {
            System.out.println(student.getName() + ", " + student.getStudID() + ", " + student.getGrade());
        }
    }
}

class AcademicRecord {
    private String studID;
    private String courseID;
    private int score;

    public AcademicRecord(String studID, String courseID, int score) {
        this.studID = studID;
        this.courseID = courseID;
        this.score = score;
    }

    public String getStudID() {
        return studID;
    }

    public String getCourseID() {
        return courseID;
    }

    public int getScore() {
        return score;
    }
}

在这个示例代码中，我们定义了一个`Student`类和一个`AcademicRecord`类。每个`Student`包含姓名、学号、专业、年级和成绩等信息，每个`AcademicRecord`包含学号、课程号和成绩等信息。我们使用`ArrayList`来存储所有学生的信息。

`Student`类实现了`Comparable`接口，并且重写了`compareTo`方法。在排序时，我们按照年级和总成绩的顺序进行排序。在判断学生是否相同时，我们重写了`equals`和`hashCode`方法，当学生姓名和学号一样时，则判定为学生相同。

在`main`方法中，我们创建了三个学生，并将它们添加到`ArrayList`中。然后，我们使用`Collections.sort`方法对学生进行排序，并输出学生的姓名、学号和年级。