java - Java 中的 Setter Getter 数组

Question

有人可以帮我解决一个小问题吗？例如，我想为 1 名学生设置 3 个讲座，但是当我尝试此操作时，我无法设置讲座。

student.setStudentLecture(lecture);
student.setStudentLecture(lecture1);

---

public class Student {
    private Lecture[] lecture;

    public void setStudentLecture(Lecture[] lecture) {
        this.lecture = lecture;
    }

    public Lecture[] getStudentLecture() {
        return lecture;
    }
}

Answer 1

您正在使用 Lecture 对象数组并使用两个不同的数组引用覆盖同一数组。因此，它不起作用。使用下面的代码:

    public class Student {
    private Lecture[] lecture;

    public void setStudentLecture(Lecture[] lecture) {
        this.lecture = lecture;
    }

    public Lecture[] getStudentLecture() {
        return lecture;
    }

    public static void main(String[] args) {
        Student student = new Student();
        Lecture[] lectures = new Lecture[3];
        lectures[0] = new Lecture("Physics");
        lectures[1] = new Lecture("Mathematics");
        lectures[2] = new Lecture("Chemistry");

        student.setStudentLecture(lectures);

        Lecture[] lectures1 = student.getStudentLecture();
        for (int i = 0; i <lectures1.length; ++i) {
            System.out.println(lectures1[i].getName());
        }
    }
}

public class Lecture {
    private String name;
    public Lecture(String name) {
        this.name = name;
    }

    public String getName(){
        return name;
    }
}