Web Reference: Aug 6, 2025 · These wildcards can be used when you want to relax the restrictions on a variable. For example, say you want to write a method that works on List < Integer >, List < Double > and List < Number >, you can do this using an upper bounded wildcard. To declare an upper-bounded wildcard, use the wildcard character ('? '), followed by the extends keyword, followed by its upper bound. Note that, in this context, extends is used in a general sense to mean either "extends" (as in classes) or "implements" (as in interfaces). You can use an upper bounded wildcard to relax the restrictions on a variable. For example, say you want to write a method that works on List , List , and List ; you can achieve this by using an upper bounded wildcard. To declare an upper-bounded wildcard, use the wildcard character ('?'), followed by the extends keyword, foll...
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