E remove(int index)
Removes the element at the specified position in this list (optional operation).
boolean remove(Object o)
Removes the first occurrence of the specified element from this list, if it is present (optional operation).
传索引返回的是E,传对象返回的是boolean类型
Removes the element at the specified position in this list (optional operation).
boolean remove(Object o)
Removes the first occurrence of the specified element from this list, if it is present (optional operation).
传索引返回的是E,传对象返回的是boolean类型
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