集合引用的集合（可以是ArrayList或任何其他集合），并希望使用这些引用来创建集合

Question

I have Collection of collection's references(may be of ArrayList or any other ) and I want to use those references and create collections.ie

ArrayList courseTitle;   //the collection references   
ArrayList<Courses> courses=new ArrayList<Course>(); 
//an arraylist to store those references

now i want to use these references and create collections with them.ie like if i have a reference 'Maths' or 'Science' in course....then i want to create collection with name 'Maths' or 'MathsList'.I am confused how to implement it.need help!!

Answer 1

Create new class which has the different attributes like courses like title, author etc.,

Implement an ArrayList for the specific type of class that is created.

Eg.

Class CourseDetails{
      public String courseTitle;
      public String author;
       //getters and setters ....

}

And create an arraylist as below in your class where you are implementing the functionality.

ArrayList<CourseDetails> arrayList = new ArrayList<CourseDetails>();

Hope this helps to some extent!

Answer 2

Instead of using Collection of collection's , you should think of designing with classes.

As per your query and comment you want the structure as follows,

Course object

public class Course {
    String courseTitle;
    List<Book> books;
    List<Instructor> instructors;
}

Book class included in Course

public class Book {
    String name;
    String author;
}

Instructor class included in Course

public class Instructor {
    String name;
    String age;
    String experience;
}

Now you can create courses like maths or science like below

List<Course> maths =  new ArrayList<Course>
List<Course> science =  new ArrayList<Course>

Answer 3

创建一个将数学和科学作为儿童班的父母班课程。