[Chapter 30] 30.25 java.util.TooManyListenersException (JDK 1.1)

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| Chapter 30 The java.util Package |

## 30.25 java.util.TooManyListenersException (JDK 1.1)

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An exception of this type signals that an AWT component or Java bean may only have one `EventListener` object registered for some specific type of event. That is, it signals that a particular event is a "unicast" event rather than a "multicast" event.

This exception type serves a formal purpose in the AWT and JavaBeans event model. Its presence in the `throws` clause of an `EventListener` registration method (even if the method never actually throws the exception) signals that an event is a unicast event.

    public class TooManyListenersException extends Exception {
        // Public Constructors
                public TooManyListenersException();
                public TooManyListenersException(String s);
    }

### Hierarchy:

Object->Throwable(Serializable)->Exception->TooManyListenersException

java.util.TimeZone (JDK 1.1) |  | java.util.Vector (JDK 1.0)