My Java Tips

AbstractList implements Collection and List interfaces. ArrayList, Vector and AbstractSequentialList extends from AbstractList. Actually AbstractList contains implementation of List interface for random access.

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If you want to create a list that should not be modified, then you should extend this class. But then you have to provide implementations for the get(int index) and size() methods.

Java Code:

public class MyList extends AbstractList {

	@Override
	public Object get(int arg0) {
		return null;
	}

	@Override
	public int size() {
		return 0;
	}
}

If you want a list to be modifiable, then you must additionally override set(int index, Object element) method.