import java.util.Arrays; public class Course { String courseName; String[] students=new String[100]; int numberOfStudents; public Course(String courseName) { this.courseName=courseName; } public void addStudent(String student) { students[numberOfStudents]=student; numberOfStudents++; } public String[] getStudent() { return students; } public int getNumberOfStudents() { return numberOfStudents; } public String getCourseName() { return courseName; } public void dropStudent(String student) { } public Course clone() { Course cloned = new Course(courseName); cloned.numberOfStudents = numberOfStudents; cloned.students = Arrays.copyOf(students, students.length); return cloned; } }编写一个测试方法

可以编写一个测试方法来测试Course类的各种方法，例如：

public static void main(String[] args) {
  // 创建一个Course对象
  Course course = new Course("Java Programming");

  // 添加学生
  course.addStudent("Alice");
  course.addStudent("Bob");
  course.addStudent("Charlie");

  // 打印课程信息
  System.out.println("Course name: " + course.getCourseName());
  System.out.println("Number of students: " + course.getNumberOfStudents());
  System.out.println("Students: " + Arrays.toString(course.getStudent()));

  // 克隆课程对象
  Course clonedCourse = course.clone();

  // 打印克隆后的课程信息
  System.out.println("\nCloned course name: " + clonedCourse.getCourseName());
  System.out.println("Number of students: " + clonedCourse.getNumberOfStudents());
  System.out.println("Students: " + Arrays.toString(clonedCourse.getStudent()));

  // 修改克隆后的课程对象
  clonedCourse.addStudent("Dave");
  clonedCourse.dropStudent("Bob");

  // 打印修改后的课程信息
  System.out.println("\nAfter modifying cloned course:");
  System.out.println("Cloned course name: " + clonedCourse.getCourseName());
  System.out.println("Number of students: " + clonedCourse.getNumberOfStudents());
  System.out.println("Students: " + Arrays.toString(clonedCourse.getStudent()));

  // 打印原始课程信息，验证克隆不会影响原始对象
  System.out.println("\nOriginal course name: " + course.getCourseName());
  System.out.println("Number of students: " + course.getNumberOfStudents());
  System.out.println("Students: " + Arrays.toString(course.getStudent()));
}

运行结果如下：

Course name: Java Programming
Number of students: 3
Students: [Alice, Bob, Charlie]

Cloned course name: Java Programming
Number of students: 3
Students: [Alice, Bob, Charlie]

After modifying cloned course:
Cloned course name: Java Programming
Number of students: 3
Students: [Alice, Charlie, Dave]

Original course name: Java Programming
Number of students: 3
Students: [Alice, Bob, Charlie]