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extends java

syntax - What's the difference between and

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I've seen the wildcard used before to mean any object - but recently saw a use of: <? extends Object> Since all objects extend Object, are these two usages synonymous?
syntax - What's the difference between <?> and <? extends Object
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syntax - What's the difference between <?> and <? extends Object
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syntax - What's the difference between <?> and <? extends Object
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