Question

我正在Scala中实现来自Jade的ContractNetInitiator，我需要重写此方法：

protected void handleAllResponses(java.util.Vector responses,java.util.Vector acceptances)

并像这样实现它：

override def handleAllResponses(responses: Vector[_], acceptances: Vector[_]): Unit = {
    var acceptProposal: ACLMessage = null
    var bestProposal = Integer.MAX_VALUE
    var bestProposer = ""

    // Find best proposal and reject all proposal
    val e = responses.elements()

    while (e.hasMoreElements) {
        val response: ACLMessage = e.nextElement().asInstanceOf[ACLMessage]

        if (response.getPerformative == ACLMessage.PROPOSE) {
            val reply = response.createReply()
            reply.setPerformative(ACLMessage.REJECT_PROPOSAL)
            acceptances.addElement(reply) // Can't add the reply : "Type mismatch, expected: _$1, actual: ACLMessage"

            if (response.getUserDefinedParameter("Value").toInt < bestProposal) {
                bestProposal = response.getUserDefinedParameter("Value").toInt
                bestProposer = response.getSender.getLocalName
                acceptProposal = reply
            }
        }
    }

    // Accept proposal
    if (acceptProposal != null) {
        acceptProposal.setPerformative(ACLMessage.ACCEPT_PROPOSAL)
    }
}

但是当我尝试添加对接受的答复时，会得到Type mismatch。

我尝试将“ acceptances：Vector [_]”更改为“ acceptances：Vector [ACLMessage]”和“ acceptances：Vector [Any]”，但由于它与超类不对应，因此无法正常工作

是否可以将元素添加到接受中？

Answer 1

您需要投射它：

 acceptances.asInstanceOf[Vector[ACLMessage]].addElement(reply)

通常需要避免，但是在这种情况下，使用raw types并仅记录有效的类型参数完全是库的错。

使用Vector类型参数覆盖Java方法

1 个答案: