Question

public static ArrayList<Lecturer> lecturers = new ArrayList<Lecturer>();
lecturers.add(Lecturer);

public Lecturer (String name, String id, String address, String email, String office, String phone_number, String research, Module mod){
    super(name, id, address, email, office, phone_number);
    this.research = research;
    this.mod = mod;
}

大家好，我创建了一个类和一个名为Lecturer的构造函数，用于存储有关讲师的详细信息。我还创建了一个Lecturer类型的ArrayList，它存储讲师的对象。但是，当我尝试添加到列表时，我不断收到“预期”错误。我知道“添加（讲师）”部分有问题，但我似乎无法弄清楚还有什么要写。任何帮助将不胜感激，谢谢。

Answer 1

尝试添加实例（并在方法内）：

public void addLecturer(...) {
  // 
  lecturers.add(new Lecturer(....));
}

更完整的版本

class Lecturers {

  public static ArrayList<Lecturer> lecturers = new ArrayList<Lecturer>();

  public static void addLecturer(Lecturer lecturer) {
    lecturers.add(lecturer);
  }

  public static void main(String[] args) {
    Lecturer one = new Lecturer(...)
    addLecturer(one);
  }
}


// you should extend a super Lecturer type
class Lecturer extends ... {

public Lecturer(String name, String id, String address, String email,   String office, String phone_number, String research, Module mod) {
    super(name, id, address, email, office, phone_number);
    this.research = research;
    this.mod = mod;
  }
}

Answer 2

尝试

lecturers.add(new Lecturer(name, id.....etc));

创建对象时需要使用new运算符，而不是Class本身！

添加到类对象的ArrayList？

2 个答案: