Java 集合。添加（E obj），但删除（Object obj）
可能的重复：
为什么 Java 集合的删除方法不是通用的？
我有一个问题关于Collection中声明的java函数的签名。 问题是：为什么add的签名涉及E（我们的类型），而remove有参数Object？
我在WWW上看到过这个问题的回答，但我不确定原因
“在删除中我们只需要 1 个操作：等于，而 Object 提供了它”
是合理的。
Possible Duplicate:
Why aren't Java Collections remove methods generic?
I have a question about signature of java functions declared in Collection.
The question is: why signature of add involves E (our type) but remove has parameter Object?
I have seen one response in WWW of this question, but I'm not sure that reason
"in remove we only need 1 operation: equals and Object provides it"
is plausible.
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我认为这是通用前时代遗留下来的。
add和remove方法都用于接受Object参数。当引入泛型时，有充分的理由更改add方法，但确实没有任何充分的理由更改remove方法（因为您引用的原因允许保持原样）。我的猜测是，如果今天从头开始设计，
Collection.remove将采用通用参数，而不是匿名对象。I think it's left over from pre-generic days. Both the
addandremovemethods used to take anObjectargument. When generics were introduced, there was good reason to change theaddmethod, but there really wasn't any good reason to change theremovemethod (because the reason you cited allowed it to remain as is).My guess is that if it were designed from scratch today,
Collection.removewould take a generic argument, not an anonymous Object.