[jdom-interest] class Node vs. interface Node

[Noam Tamim]

Hi.

If we want to, we CAN prevent users of subclassing Node. For that, we need
Node to be an abstract class rather than an interface:


// Node.java
package test;

public abstract class Node {
 Node() {
  // default access - prevent subclassing by other packages
 }
}


// Element.java
package test;

public class Element extends Node {
    // ...
}


// OtherNode.java
package test2;

import test.*;

public class OtherNode extends Node {
    // compilation error: Node() has default access in test.Node
}



 - Noam.