Setter Getter 数组 Java

Question

谁能帮我解决一个小问题。例如，我想为 1 个学生设置 3 个讲座，但是当我尝试这个时，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

因为你setter也是数组，你可以创建Lecture数组，设置为Student。

样本：-

Student student = new Student();
Lecture lecture = new Lecture();
Lecture lecture1 = new Lecture();
Lecture[] lectureArr = new Lecture[]{lecture, lecture1};
student.setStudentLecture(lectureArr);

而且你有 studentLecture 作为数组，那么为什么你要两次分配不同的数组，你可以合并两个数组并分配它。

Answer 2

您正在使用 Lecture 对象数组并用两个不同的数组引用覆盖同一个数组。因此，它不起作用。使用以下代码：

    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;
    }
}

Setter Getter 数组 Java

Setter Getter Arrays Java

java

arrays

getter

setter