设置器Getter数组Java [英] Setter Getter Arrays Java

问题描述

有人可以帮我解决一个小问题。例如，我想为1个学生设置3个讲座，但是当我尝试设置这个课程时，我无法设置讲座。

Can somebody help me with one little problem. I want to set for example 3 lectures to 1 student, but when i try this i can't set lectures.

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

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public class Student {
    private Lecture[] lecture;

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

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

推荐答案

您正在使用演讲对象数组，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。使用以下代码：

You are using Array of Lecture objects and overwriting the same array with two different array references. Hence, it is not working. Use the below code:

    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;
    }
}

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