Java 关于@Override

Question

那么我不明白覆盖有什么问题:

@Override
public ProtocolEncoder getEncoder(IoSession session) throws Exception {
    return encoder;
}
@Override
public ProtocolDecoder getDecoder(IoSession session) throws Exception {
    return decoder;
}

错误:

error: method does not override or implement a method from a supertype
@Override

error: MaplePacketDecoder is not abstract and does not override abstract method doDecode(IoSession,ByteBuffer,ProtocolDecoderOutput) in CumulativeProtocolDecoder
public class MaplePacketDecoder extends CumulativeProtocolDecoder {

error: method write in interface ProtocolEncoderOutput cannot be applied to given types;
                out.write(IoBuffer.wrap(ret));
  required: ByteBuffer
  found: IoBuffer
  reason: actual argument IoBuffer cannot be converted to ByteBuffer by method invocation conversion

Answer 1

您忘记实现 doDecode(IoSession,ByteBuffer,ProtocolDecoderOutput)。