Databases
StackOverflow2013
Postsdbo
POAdding an ArrayList into a class - what does it do?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAdding an ArrayList into a class - what does it do?
    primarykey
    data
    text
    <p>Following on from this Q of mine: <a href="https://stackoverflow.com/questions/754184/whats-the-best-way-to-make-this-java-program">What&#39;s the best way to make this Java program?</a></p> <p>I was recommended to store a list in Lecturer class and Course class. So I did, and it looks something like this:</p> <pre><code>public class Lecturer { private String id; private String name; List&lt;Course&gt; courses = new ArrayList&lt;Course&gt;(); // a list to hold the courses public Lecturer(String idIn, String nameIn) // arguments of the constructor { id = idIn; name = nameIn; } } </code></pre> <p>Same thing for the Course class except it has Lecturer list. But what I dont get is what does placing a list there exactly do? cos I dont know where to put the methods of the ArrayList such as adding and removing lecturers from it?</p> <p>Can someone explain the purpose of this?</p> <p>I use another method which is basically placing the arraylists and its methods in two seperate classes for the lecturer and course, and then I simply add into the Course and Lecturer class as an attribute eg:</p> <pre><code>public class Lecturer { private String id; private String name; private CourseList courses; // COurseList is the class with the arraylist and methods public Lecturer(String idIn, String nameIn) // arguments of the constructor { id = idIn; name = nameIn; courses = new CourseList(); } } </code></pre> <p>I hope i'm making sense, cos ive been stuck on one thing for the last 2 weeks which no seems to understand.</p> <p>Thank you</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. This table or related slice is empty.
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POAdding an ArrayList into a class - what does it do?
      1. USTStamper
      1. VTFavorite
    2. VO
      singulars
      1. POAdding an ArrayList into a class - what does it do?
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload