Removes the first occurrence of the specified element from this list, if it is present (optional operation). If this list does not contain the
element, it is unchanged. More formally, removes the element with the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))) (if such anelement exists). Returns true if this list contained the specified element (or equivalently, if this list changed as a result of the call).删除第⼀个出现的相同对象，判断时，需要使⽤equals⽅法，如果是⾃⼰创建的对象，需要重写类的hashCode和equals⽅法
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