Alternate of C# Events in Java

Question

I am .Net developer. i want to know that is there any event handling mechanism in Java for Events Handling like C#.

what i want to do is i want to raise/fire an even

Answer 1

Although most of the examples will be to do with GUI events, the principles are basically the same. You basically want an interface or abstract class to represent a handler for the event, e.g.

public interface EventHandler
{
    // Change signature as appropriate of course
    void handleEvent(Object sender, EventArgs e);
}

then the publisher of the event would have:

public void addEventHandler(EventHandler handler)
public void removeEventHandler(EventHandler handler)

It would either keep a list of event handlers itself, or possibly have them encapsulated in a reusable type. Then when the event occurs, you just call handleEvent in each handler in turn.

You can think of delegate types in C# as being very similar to single-method interfaces in Java, and events are really just an add/remove pair of methods.