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super.clone()is的返回类型Object,因为它是 的直接祖先BitVectorFlowMap,因此它不是 的有效返回值clone(),它必须返回某种类型的东西BitVectorFlowMap。您必须实际构建一个BitVectorFlowMap具有相同数据的新实例。
super.clone()
Object
BitVectorFlowMap
clone()