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This principle means that there are no methods in each interface that subclasses cannot use but must implement. If not, the interface must be split. It is better to use multiple isolated interfaces than to use a single interface (an interface where multiple interface methods are assembled into one).In the interview, the reporter saw that for ordinary small express delivery, many people would unpack the package at the express delivery point, take out the items and throw the package directly into the garbage can. Later, the reporter came to an express service point and happened to meet a staff member who was packing the mail. The boxes containing the clothes were packed thick. He said, "In case of scratching, in case the bags are broken and the clothes of others are scratched, how can they return the goods for exchange?"由上海逍客文化传媒有限公司,天津淘梦银汉天河网络技术有限公司出品,淘梦银河独家宣发的《南海鲛人》在象山影视城神雕广场举行开机仪式！两人目光交会。Five Earth teens - Keith, Lance, Hunk, Pidge and Shiro - who become the last line of defense for the galaxy in an intergalactic battle against the evil alien force led by King Zarkon.Note: Ref is used here to inject another object这部描写女排运动员刻苦训练、顽强拼争的电视剧在八十年代产生了巨大影响。小鹿纯子以“晴空霹雳”、“幻影旋风”等带有魔幻色彩的打球技巧，使排球这项体育风行一时。她们的精湛球技与顽强拼搏的精神打动了无数观众的心。