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In fact, we can also modify the "default policy" of the specified chain. Yes, it is the default policy marked in the following figure.124. X.X.250Once these major changes occur,The third adapter mode is the adapter mode of the interface, The adapter for the interface is as follows: Sometimes we write an interface with multiple abstract methods, When we write the implementation class for the interface, All methods of the interface must be implemented, This is obviously wasteful at times, Because not all methods are what we need, Sometimes only a few are needed, In order to solve this problem here, we have introduced the adapter mode of the interface. With the help of an abstract class, the abstract class implements the interface and all methods. However, we do not deal with the original interface, but only get in touch with the abstract class, so we write a class, inherit the abstract class and rewrite the methods we need. Take a look at the class diagram:Copyright Southern Fortune Network边境丛林，一场缉毒行动遭袭击，行动失败。3年后，缉毒行动中的生还者—警察李国宝，“毒贩”王旭突然现身。归队后的李国宝被任命缉毒副队长；而原本是卧底警察的王旭因副局长曾海昏迷而归队无望。此时，市内发现制毒窝点，同时发生银行劫案，王旭凭借高超的制度及手段打入毒贩内部，利用各种黑势力的勾心斗角暗查地下毒枭琅猜犯罪事实，同时发现李国宝曾在三年前缉毒行动失败后曾被琅猜挟制而被其控制。对抗升级，王旭陷入重重困境。一次行动中，女国际刑警卡卡发现王旭手中的“平安扣”，因此得知王旭的真实身份。在卡卡和公安局尚局长帮助下，王旭营救了被琅猜绑架的女儿叶小回，最终化妆成毒贩打入琅猜毒巢并成功捣毁 。1936年12月，西安事变爆发，国共两党关系微妙。军校即将毕业的地下党冉华被同学宁鹏飞泄露身份，招致祸端。未婚妻石莉为救冉华家破人亡，无奈与冉华之弟冉国上山落草。抗战爆发，冉华与宁鹏飞尽释前嫌，联手抗日。在此期间，邓梅爱上冉华，但冉华始终思念石莉，不为所动。抗战胜利，冉华与宁鹏飞因立场不同再生间隙，宁鹏飞女友、冉华之妹冉辛在内战中牺牲。全国基本解放，冉华率领先锋团挺进川渝，解放大西南。宁鹏飞受命留在武陵山，抵御解放军。石莉和冉国受到宁鹏飞蛊惑，对解放军产生误解。宁鹏飞伏击先锋团，邓梅受伤牺牲。冉华误以为这一切是石莉所为，几人展开一段错综纠结的恩怨情仇。几经磨难，石莉与冉华尽释前嫌，联手击败宁鹏飞的势力。宁鹏飞不甘失败，暗中在重庆启动爆炸计划。关键时刻，冉华与石莉、冉国联手，摧毁宁鹏飞的计划。