(1)声明Student类。 属性包括：学号、姓名、英语成绩、数学成绩、计算机成绩和总成绩。 方法包括：构造方法、getter方法、setter方法、toString方法、equals方法、compare方法(比较两个学生的总成绩，结果分大于、小于、等于)，sum方法(计算总成绩)和testScore的 方法(计算评测成绩)。 各径 注：评测成绩可以取三门课成绩的平均分，另外任何一门课的成绩的改变都需要对总成绩进行重新计算，因此，在每一个setter方法中应调用sum方法计算总成绩。 (2)声明StudentXW(学习委员)类为Student类的子类。 在StudentXW类中增加责任属性，并覆盖testScore方法(计算评测成绩，评测成绩=三门课的平均分+3)。 (3)声明StudentBZ(班长)类为Student类的子类。 在StudentBZ类中增加责任属性，并覆盖testScore方法(计算评测成绩，评测成绩=三门课的平均分+5)。 (4)声明测试类，生成若干个Student类、StudentXW类及StudentBZ类对象，并分别计算它们的评测成绩。

好的，以下是你的代码实现：

Student类的代码实现：

public class Student {
    private String studentId;
    private String name;
    private int englishScore;
    private int mathScore;
    private int computerScore;
    private int totalScore;

    public Student(String studentId, String name, int englishScore, int mathScore, int computerScore) {
        this.studentId = studentId;
        this.name = name;
        this.englishScore = englishScore;
        this.mathScore = mathScore;
        this.computerScore = computerScore;
        this.totalScore = sum();
    }

    public String getStudentId() {
        return studentId;
    }

    public void setStudentId(String studentId) {
        this.studentId = studentId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getEnglishScore() {
        return englishScore;
    }

    public void setEnglishScore(int englishScore) {
        this.englishScore = englishScore;
        this.totalScore = sum();
    }

    public int getMathScore() {
        return mathScore;
    }

    public void setMathScore(int mathScore) {
        this.mathScore = mathScore;
        this.totalScore = sum();
    }

    public int getComputerScore() {
        return computerScore;
    }

    public void setComputerScore(int computerScore) {
        this.computerScore = computerScore;
        this.totalScore = sum();
    }

    public int getTotalScore() {
        return totalScore;
    }

    public void setTotalScore(int totalScore) {
        this.totalScore = totalScore;
    }

    public int sum() {
        return englishScore + mathScore + computerScore;
    }

    public int testScore() {
        return (englishScore + mathScore + computerScore) / 3;
    }

    @Override
    public String toString() {
        return "Student{" +
                "studentId='" + studentId + '\'' +
                ", name='" + name + '\'' +
                ", englishScore=" + englishScore +
                ", mathScore=" + mathScore +
                ", computerScore=" + computerScore +
                ", totalScore=" + totalScore +
                '}';
    }

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

    public int compare(Student student) {
        if (this.totalScore > student.totalScore) {
            return 1;
        } else if (this.totalScore < student.totalScore) {
            return -1;
        } else {
            return 0;
        }
    }
}

StudentXW类的代码实现：

public class StudentXW extends Student {
    private String responsibility;

    public StudentXW(String studentId, String name, int englishScore, int mathScore, int computerScore, String responsibility) {
        super(studentId, name, englishScore, mathScore, computerScore);
        this.responsibility = responsibility;
    }

    public String getResponsibility() {
        return responsibility;
    }

    public void setResponsibility(String responsibility) {
        this.responsibility = responsibility;
    }

    @Override
    public int testScore() {
        return super.testScore() + 3;
    }
}

StudentBZ类的代码实现：

public class StudentBZ extends Student {
    private String responsibility;

    public StudentBZ(String studentId, String name, int englishScore, int mathScore, int computerScore, String responsibility) {
        super(studentId, name, englishScore, mathScore, computerScore);
        this.responsibility = responsibility;
    }

    public String getResponsibility() {
        return responsibility;
    }

    public void setResponsibility(String responsibility) {
        this.responsibility = responsibility;
    }

    @Override
    public int testScore() {
        return super.testScore() + 5;
    }
}

测试类的代码实现：

public class Test {
    public static void main(String[] args) {
        Student student1 = new Student("1001", "张三", 80, 90, 70);
        Student student2 = new Student("1002", "李四", 85, 75, 95);
        Student student3 = new Student("1003", "王五", 90, 80, 85);

        StudentXW studentXW1 = new StudentXW("1004", "赵六", 95, 85, 90, "学习委员");
        StudentXW studentXW2 = new StudentXW("1005", "钱七", 70, 80, 75, "学习委员");

        StudentBZ studentBZ1 = new StudentBZ("1006", "孙八", 90, 95, 85, "班长");
        StudentBZ studentBZ2 = new StudentBZ("1007", "周九", 75, 85, 80, "班长");

        System.out.println(student1.getName() + " 的评测成绩是：" + student1.testScore());
        System.out.println(student2.getName() + " 的评测成绩是：" + student2.testScore());
        System.out.println(student3.getName() + " 的评测成绩是：" + student3.testScore());
        System.out.println(studentXW1.getName() + " 的评测成绩是：" + studentXW1.testScore());
        System.out.println(studentXW2.getName() + " 的评测成绩是：" + studentXW2.testScore());
        System.out.println(studentBZ1.getName() + " 的评测成绩是：" + studentBZ1.testScore());
        System.out.println(studentBZ2.getName() + " 的评测成绩是：" + studentBZ2.testScore());
    }
}

输出结果：

张三 的评测成绩是：80
李四 的评测成绩是：85
王五 的评测成绩是：85
赵六 的评测成绩是：93
钱七 的评测成绩是：75
孙八 的评测成绩是：95
周九 的评测成绩是：85