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Iterator pattern provides a way to access each element in a collection object sequentially without exposing the internal representation of the object, which can not only not expose the internal structure of the collection, but also allow external code to transparently access the internal elements of the collection. The specific structure diagram is shown below.尉缭道：诗曼也会劝慰的的，双管齐下，想来应该会很有效果的，你就不要太担心。Abnormal problem: The promotion information of commodities shall be subject to the information in the "Promotion" column of the commodity details page; The specific selling price of the goods shall be subject to the price on the order settlement page; If you find any abnormality in the selling price or promotion information of the active goods, it is recommended to contact the seller for consultation before purchasing.在外闯荡多年的里瓦带着野心和魅力回到了家乡Kinshasa。这里正闹汽油饥荒，而里瓦同他的伙伴设法搞到了一大笔，发大财的机会就在眼前，然而他们并不是唯一看上这笔生意的人。We know from the above analysis that the magnification of the explosive arrow is 70% of that of the flame arrow under the condition of no critical strike and no head explosion. Then why is the damage of the flame arrow lower than that of the explosion arrow? According to analysis from the upstairs, the number of explosive arrows is 3W3 (about), which will be improved with the war roar. The increase is not much, about 13%, then about 3W7. AOE 20w * 0.7 of Flame Arrow is 14w. When the explosion occurs, five enemies, each of whom will be affected by the explosion AOE of the other four enemies, that is 3W7*4=14. 8W. In total, each enemy received 14+14.8 = 28.8 w of damage. The inference is consistent with the actual result."Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example: