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Singleton mode refers to ensuring that there is only one instance of a class and providing a global access point. It solves the problem of the number of entity objects, while other builder modes all solve the coupling problem brought by new. The main points of its implementation include:秦枫越听越怒。第三集中，原田饰演的诚的前上司上河内秀人为中心的故事。权力骚扰成为问题，被公司开除的上河内，无依无靠的他遇到了围着孩子食堂转的芳江（麻生佑未）和两个年幼的兄弟。而诚留下的三坪房间的钢琴师竟然开始照亮上河内的前途……。重修三次大学，玩了三年，公务员考试准备了三年的河阴奉式家族三代独子奉必（金在中 饰）是小区出名的神级无业游民。在听闻自己单恋了28年的女性朋友姜秀珍（金宥真 饰）就要结婚的晴天霹雳后，沮丧的他坠入奇怪的检查井开始了一场荒唐的时间之旅。如果无法阻止一周以后心爱的她的婚礼，那么他将以宾客而非新郎的身份出席这场婚礼。面对这样的境况，他可以成功的阻止这场婚礼，得到她的心吗？+= is to inform you when this event occurs, and -= is to inform you no longer when this event occurs.Conclusion: The page with SingleInstance is initially created with a task stack to this page, and then the pages in this stack are reused all the time. Note that only this mode will create a new stack for the initialized page. The rule of return is to finish the stack where this page is located first, and then finish each page of the next stack.