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並前往https://www.quora.com/In-Java-is-there-any-way-to-say-type-T-extends-either-Type-1-or-Type-2-where-the-only-common-ancestor-of-Type-1-and-Type-2-is-Object

In Java, is there any way to say type T extends either ... - Quora

No, and that's by design. If the generic types' common ancestor is Object, you can only reliably use Object methods to query parameters of that type.

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