java（需要标识符）getter/setter和对象

Question

我的程序有问题。当我尝试编译以下内容时，我只收到消息：

Tutorium.java:15: error: <identifier> expected
    public void settName(vorlesung.lectureName) {
                                              ^

所以我的代码是：

教程。爪哇

public class Tutorium {
private Vorlesung vorlesung;
public String tName;
private int tNumber;


public int gettNumber() {
    return this.tNumber;
}

public String gettName() {
    return this.tName;
}

public void settName(vorlesung.lectureName) {
    this.tName = vorlesung.lectureName;
}

public String toString() {
    return (this.tName + ", " + this.tNumber);
}

public Tutorium(int tNumber){
    this.tNumber = tNumber; } }

沃勒松。爪哇

public class Vorlesung {
public String lectureName;
private int lectureNumber;
private int lecture;
private Dozent dozent;
private String lecturerlName;

public String getlectureName(){
    return this.lectureName;
}

public int lectureNumber(){
    return this.lectureNumber;
}

public int lecture(){
    return this.lecture;
}

public String getlecturer(){
    this.lecturerlName = dozent.lecturerlName;
    return this.lecturerlName;
}

public String toString() {
    return (this.lectureName + ", " + this.lectureNumber);
}

public Vorlesung(String lectureName, int lecture) {
    this.lectureName = lectureName;
    this.lecture = lecture +1;
    this.lectureNumber = this.lecture -1;
    this.lecturerlName = lecturerlName;
}}

我的主要方法是：

public class MainVorlesung {
public static void main(String[] args) {
    Student student = new Student("STUDENTNAME", "STUDENTLASTNAME", 178, 1);
    Vorlesung vorlesung = new Vorlesung("Programmieren", 13341);
    Tutorium tutorium = new Tutorium(3);
    Dozent dozent = new Dozent("LECTURERFIRSTNAME", "LECTURERLASTNAME", 815);

    System.out.println(student.toString());
    System.out.println(vorlesung.toString());
    System.out.println(tutorium.toString());
    System.out.println(dozent.toString());

}}

我的目标是将tName的值设置为vorlesung的值。讲师姓名

为什么我不能这样做

我感谢你的帮助 谢谢

Answer 1

将settName更改为

public void settName(String name) {
    this.tName = name;
}

Answer 2

对于方法，传入的参数必须具有声明的值

在本例中，是一个字符串。因此，您需要将方法更改为：

public void settName(String newLectureName) {
    this.tName = newLectureName;
}

在这里阅读关于什么是java方法以及如何创建java方法的更多信息：http://www.tutorialspoint.com/java/java_methods.htm

Answer 3

因为你的目标是：

My goal is to set the value of tName equal the value of vorlesung.lectureName.

您应该完全摆脱setName方法，因为它将完全依赖于vorlesung字段，因此不应该是可变的。您还应该去掉tName字段，将getName()改为：

public class Tutorium {
    private Vorlesung vorlesung;
    // public String tName;  // get rid of
    private int tNumber;



    public String gettName() {
        if (vorlesung != null) {
            return vorlesung.getlecturer();
        }

        return null; // or throw exception
    }

    // *** get rid of this since you won't be setting names
    // public void settName(Vorlesung vorlesung) {
    //     this.tName = vorlesung.lectureName;
    // }

---

我刚才注意到，您的Tutorium类没有并且绝对需要一个setVorlesung(...)方法

public void setVorlesung(Vorlesung vorlesung) {
    this.vorlesung = vorlesung;
}