list列表移除元素(list.remove())

list.remove()

/**
 * Removes the element at the specified position in this list (optionaloperation).  
 * Shifts any subsequent elements to the left (subtracts one from their indices).  
 * Returns the element that was removed from the list.
 * 翻譯：刪除列表中指定位置的元素(可選操作)。將後續元素向左移動(從其索引中減去一個)。返回從列表中刪除的元素
 * 
 * @param index the index of the element to be removed
 * @return the element previously at the specified position
 * @throws UnsupportedOperationException if the <tt>remove</tt> operation
 *         is not supported by this list
 * @throws IndexOutOfBoundsException if the index is out of range
 *         (<tt>index &lt; 0 || index &gt;= size()</tt>)
*/
E remove(int Index);

/**
 * 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 <tt>i</tt> such that
 * <tt>(o==null&nbsp;?&nbsp;get(i)==null&nbsp;:&nbsp;o.equals(get(i)))</tt>
 * (if such an element exists).  Returns <tt>true</tt> if this list
 * contained the specified element (or equivalently, if this list changed
 * as a result of the call).
 * 翻譯：
 * @param o element to be removed from this list, if present
 * @return <tt>true</tt> if this list contained the specified element
 * @throws ClassCastException if the type of the specified element
 *         is incompatible with this list
 * (<a href="Collection.html#optional-restrictions">optional</a>)
 * @throws NullPointerException if the specified element is null and this
 *         list does not permit null elements
 * (<a href="Collection.html#optional-restrictions">optional</a>)
 * @throws UnsupportedOperationException if the <tt>remove</tt> operation
 *         is not supported by this list
 */
boolean remove(Object o)

案例1：