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esus.com | programming blog
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日期：2026-04-22
An argument or return type in an overridden method that is made more specialized is called to be covariant. Allowing covariant return types in Java has been in Sun’s bugparade for a long time (http://bugs.sun.com/bugdatabase/view_bug.do? bug_id=4144488. N...看更多
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