用java写一个学籍管理系统，要求附带学生成绩，学号，姓名，年龄，可以统计全部学生的总成绩，及其在班上的排名，能够统计各 科的平均成绩及及指率，要求有错误是示功能，

以下是一个简单的学籍管理系统的Java代码，包含学生成绩、学号、姓名、年龄等信息，并可以统计总成绩、排名、各科平均成绩和指率，并具备错误提示功能：

import java.util.*;

public class StudentManagementSystem {

private ArrayList<Student> students;

public StudentManagementSystem() {
students = new ArrayList<Student>();
}

public void addStudent(Student s) {
students.add(s);
}

public void removeStudent(String id) {
for (int i = 0; i < students.size(); i++) {
if (students.get(i).getID().equals(id)) {
students.remove(i);
return;
}
}
System.out.println("Error: No student with ID " + id + " found.");
}

public Student findStudent(String id) {
for (int i = 0; i < students.size(); i++) {
if (students.get(i).getID().equals(id)) {
return students.get(i);
}
}
System.out.println("Error: No student with ID " + id + " found.");
return null;
}

public void listStudents() {
System.out.println("ID\tName\tAge\tTotal Score\tRank");
Collections.sort(students);
for (int i = 0; i < students.size(); i++) {
System.out.println(students.get(i).getID() + "\t" + students.get(i).getName() + "\t" + students.get(i).getAge() + "\t" + students.get(i).getTotalScore() + "\t\t" + (i + 1));
}
}

public double getAverageScore(String course) {
double sum = 0;
int count = 0;
for (int i = 0; i < students.size(); i++) {
if (students.get(i).getScore(course) >= 0) {
sum += students.get(i).getScore(course);
count++;
}
}
return (count == 0) ? 0 : (sum / count);
}

public double getPassRate(String course) {
int passCount = 0;
int totalCount = 0;
for (int i = 0; i < students.size(); i++) {
if (students.get(i).getScore(course) >= 0) {
totalCount++;
if (students.get(i).getScore(course) >= 60) {
passCount++;
}
}
}
return (totalCount == 0) ? 0 : ((double) passCount / totalCount);
}

public static void main(String[] args) {
StudentManagementSystem sms = new StudentManagementSystem();

// Add some students
sms.addStudent(new Student("1001", "Alice", 18));
sms.addStudent(new Student("1002", "Bob", 19));
sms.addStudent(new Student("1003", "Charlie", 20));

// Add some scores
sms.findStudent("1001").addScore("Math", 80);
sms.findStudent("1001").addScore("English", 85);
sms.findStudent("1002").addScore("Math", 70);
sms.findStudent("1002").addScore("English", 75);
sms.findStudent("1003").addScore("Math", 60);
sms.findStudent("1003").addScore("English", 65);

// List all students
sms.listStudents();

// Get average and pass rate for Math
System.out.println("Math Average Score: " + sms.getAverageScore("Math"));
System.out.println("Math Pass Rate: " + sms.getPassRate("Math"));

// Remove a student
sms.removeStudent("1002");

// List all students again
sms.listStudents();
}

}

class Student implements Comparable<Student> {

private String id;
private String name;
private int age;
private HashMap<String, Integer> scores;

public Student(String id, String name, int age) {
this.id = id;
this.name = name;
this.age = age;
scores = new HashMap<String, Integer>();
}

public void addScore(String course, int score) {
scores.put(course, score);
}

public int getScore(String course) {
if (scores.containsKey(course)) {
return scores.get(course);
} else {
System.out.println("Error: No score for course " + course + ".");
return -1;
}
}

public int getTotalScore() {
int sum = 0;
for (int score : scores.values()) {
sum += score;
}
return sum;
}

public String getID() {
return id;
}

public String getName() {
return name;
}

public int getAge() {
return age;
}

public int compareTo(Student s) {
return s.getTotalScore() - this.getTotalScore();
}

}