用java针对学生选课系统写一个测试类，输入1展示课程信息，输入2进行选课，输入3查看个人选课，且当选中一个课程时，该课程标注为已选，选课人数加一

好的，我可以为您编写这个测试类。首先，我们需要先定义一个 `Course` 类和一个 `Student` 类，代码如下：

public class Course {
    private String name;
    private int capacity;
    private int enrolled;

    public Course(String name, int capacity) {
        this.name = name;
        this.capacity = capacity;
        this.enrolled = 0;
    }

    public String getName() {
        return name;
    }

    public int getCapacity() {
        return capacity;
    }

    public int getEnrolled() {
        return enrolled;
    }

    public boolean isFull() {
        return enrolled >= capacity;
    }

    public void enroll() {
        enrolled++;
    }
}

public class Student {
    private String name;
    private List<Course> courses;

    public Student(String name) {
        this.name = name;
        this.courses = new ArrayList<>();
    }

    public String getName() {
        return name;
    }

    public List<Course> getCourses() {
        return courses;
    }

    public void enroll(Course course) {
        if (!course.isFull()) {
            course.enroll();
            courses.add(course);
        } else {
            System.out.println("Sorry, the course is already full.");
        }
    }
}

接下来，我们可以编写一个名为 `CourseRegistrationTest` 的测试类，来测试这个选课系统。代码如下：

import java.util.Scanner;

public class CourseRegistrationTest {
    public static void main(String[] args) {
        Course[] courses = {
                new Course("Java Programming", 50),
                new Course("Data Structures and Algorithms", 40),
                new Course("Web Development", 30)
        };

        Student student = new Student("Alice");

        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("1. Show course information");
            System.out.println("2. Enroll in a course");
            System.out.println("3. View personal course schedule");
            System.out.print("Please enter your choice (1-3): ");
            int choice = scanner.nextInt();
            scanner.nextLine();

            switch (choice) {
                case 1:
                    for (Course course : courses) {
                        System.out.printf("%s (%d/%d)\n", course.getName(), course.getEnrolled(), course.getCapacity());
                    }
                    break;
                case 2:
                    System.out.print("Please enter the name of the course: ");
                    String courseName = scanner.nextLine();
                    boolean foundCourse = false;
                    for (Course course : courses) {
                        if (course.getName().equals(courseName)) {
                            foundCourse = true;
                            student.enroll(course);
                            break;
                        }
                    }
                    if (!foundCourse) {
                        System.out.println("Sorry, the course is not found.");
                    }
                    break;
                case 3:
                    System.out.println("Personal course schedule:");
                    for (Course course : student.getCourses()) {
                        System.out.println(course.getName());
                    }
                    break;
                default:
                    System.out.println("Invalid choice. Please try again.");
                    break;
            }
            System.out.println();
        }
    }
}

这个测试类首先创建了三个课程，并创建一个名为 `Alice` 的学生。然后，它进入一个循环，让用户输入选项。如果用户输入 `1`，它会展示所有课程的信息，包括课程名称和已选人数。如果用户输入 `2`，它会提示用户输入课程名称，并尝试让学生选修这个课程。如果用户输入 `3`，它会展示学生已选的课程。如果用户输入无效的选项，它会提示用户重新输入。注意，当课程已经满员时，学生无法再选修该课程。

希望这个测试类能够满足您的需求。如果您有任何问题，请随时问我。