Why Observable in Java use Vector?

Question

From the SDK

public class Observable {
    private boolean changed = false;
    private Vector obs;

    /** Construct an Observable with zero Observers. */

    public Observable() {
    obs = new Vector();
    }

What is the main reason for using Vector instead of more type-safe collection such as List<Observer>?

I guess it's just because it's an old code. Generics came in 1.6. — John Dvorak
– John Dvorak, Commented Jan 22, 2013 at 0:09

NPE · Accepted Answer · 2013-01-22 00:09:35Z

8

It's a very old class, dating back to JDK 1.0. At the time, there was no List.

answered Jan 22, 2013 at 0:09

NPE

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12 Comments

John Dvorak Over a year ago

" dating back to JDK 1.0 " -- can you share your references?

NPE Over a year ago

@JanDvorak: Sure: docs.oracle.com/javase/7/docs/api/java/util/Observable.html (Since: JDK1.0).

aromero Over a year ago

The List interface (no generics) was added in 1.2

Steve Kuo Over a year ago

@Chan You're avoiding Observable because it internally uses a class you don't like?

Steve Kuo Over a year ago

@fazhool List is an interface

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