An exception of this type is thrown to indicate that the result of a computation cannot be retrieved because the computation was canceled. The get( ) method of the Future interface may throw a CancellationException, for example.

Figure 16-74. java.util.concurrent.CancellationException

public class CancellationException extends IllegalStateException {
// Public Constructors
     public CancellationException( );  
     public CancellationException(String message);  
}