why a Socket is not instanceof Closeable at runtime?

Question

In an Android app, I added this code to onCreate()

    Closeable sss = new Socket();
    if (!(sss instanceof Closeable)) {
        throw new Runtim         


        

Answer 1

This issue occurs on Android API levels prior to 19. On affected versions, Socket does not implement Closeable.

Sources:

• Android: Exception using Closeable interface with Socket
• https://code.google.com/p/android/issues/detail?id=62909