Override abstract in a function

I want to add an extra parameter to send()

In DumpSequence.java:

private static Receiver sm_receiver = new DumpReceiver(System.out, true);

sm_receiver.send(message, lTicks); (Work)
sm_receiver.send(message, lTicks, addParam1); (Won't work)

DumnpReceiver.java I tried to add extra param which is lTimeStam开发者_Go百科p2:

public void send(MidiMessage message, long lTimeStamp, long lTimeStamp2) {...}

Error:

DumpSequence.java:136: send(javax.sound.midi.MidiMessage,long) in javax.sound.mi
di.Receiver cannot be applied to (javax.sound.midi.MidiMessage,long,long)
                sm_receiver.send(message, lTicks, lTicks);
                           ^
.\DumpReceiver.java:21: DumpReceiver is not abstract and does not override abstr
act method send(javax.sound.midi.MidiMessage,long) in javax.sound.midi.Receiver
public class DumpReceiver
       ^
2 errors

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remove the @Override annotation from line 21

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If you extend an abstract class it needs to define all the abstract method or it needs to be abstract class.

Or if you are overloading method then just remove @Override annotation

See Also

• Method Overriding

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If you want to call send(MidiMessage message, long lTimeStamp, long lTimeStamp2) you need to use a DumpReceiver instance, not a Receiver one. There is no such method in `Receiver

private static DumpReceiver sm_receiver = new DumpReceiver(System.out, true);

EDIT: by inheritance, you can still use it as a plain Receiver object.

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You still have to implement send(javax.sound.midi.MidiMessage,long), even if you don't use it - it's required by the interface you implemented