请你提供一个完整的java程序，要求该程序定义一个Student数组，其中保存学生的基本信息：姓名，学号，性别，还有分别保存的3门课程成绩以及对应的学分，并计算这三门课程的学分积，按照学分积的降幂排序输出。

import java.util.Arrays;

class Course {
    String name;
    double grade;
    double credit;

    public Course(String name, double grade, double credit) {
        this.name = name;
        this.grade = grade;
        this.credit = credit;
    }

    public double getTotalCredit() {
        return grade * credit;
    }
}

class Student {
    String name;
    int id;
    char gender;
    Course[] courses = new Course[3];

    public void addCourse(Course course) {
        courses[courses.length - 1] = course;
    }

    @Override
    public String toString() {
        double totalCredit = 0;
        for (Course course : courses) {
            totalCredit += course.getTotalCredit();
        }
        Arrays.sort(courses, (a, b) -> Double.compare(b.getTotalCredit(), a.getTotalCredit()));
        return "Name: " + name + ", ID: " + id + ", Gender: " + gender +
                ", Total Credit: " + totalCredit + ", Courses (Highest to Lowest): " + Arrays.toString(courses);
    }
}

public class Main {
    public static void main(String[] args) {
        // 创建学生数组
        Student[] students = new Student[2];
        students[0] = new Student();
        students[0].name = "张三";
        students[0].id = 1001;
        students[0].gender = 'M';
        students[0].addCourse(new Course("数学", 85, 4));
        students[0].addCourse(new Course("物理", 90, 3));
        students[0].addCourse(new Course("英语", 88, 2));

        students[1] = new Student();
        students[1].name = "李四";
        students[1].id = 1002;
        students[1].gender = 'F';
        students[1].addCourse(new Course("化学", 95, 4));
        students[1].addCourse(new Course("生物", 87, 2));
        students[1].addCourse(new Course("语文", 80, 3));

        for (Student student : students) {
            System.out.println(student);
        }
    }
}

这个Java程序首先定义了两个类，`Course`表示单门课程，包含名字、分数和学分；`Student`表示学生，包含姓名、学号、性别和一个课程数组。然后在`main`函数中创建了一个`Student`数组，并给每个学生添加了课程，最后通过`toString`方法按照总学分积降序排列并打印出每个学生的详细信息。