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Class has only one instance. Q: How can we guarantee it? Answer: Private constructors are used to ensure that classes cannot be instantiated outside the class.The landlord has no lower floor. . . What a pity心如所愿变成女人的恶少陈大嘴，来到了青铜镇,化名陈依依，目的是为了给自己死去的树精干娘-绿婆婆报仇。陈依依倡导建立大女子世界，让尹天仇一步步钻入了自己的圈套，不明白真相的尹天仇被其美色迷惑还在暗中一直帮助陈依依，但是小铃铛因为两个尸妖的被杀，知道了陈依依的真实面目，尹天仇醒悟过来后欲铲除妖魔，但此时陈依依已经修炼成妖法高深的花妖…….该剧讲述了燕破岳从一名单兵素质突出，却与集体格格不入的兵王，在严酷环境与艰巨任务的锤打之下，逐渐融入群体，与战友们并肩作战共同成长，最终成长为优秀武警特战队员的热血军旅故事。只闻老妇道：朱厚熜。她不管说啥咱都得忍着受着，这样才是读书人的行径，是不是？板栗举手拦住黄豆，板着脸道：牛儿，你这话我可不敢认。1. There are two options to manage the creation and destruction of state objects. The first is to create and then destroy state objects only when they are needed, and the other is to create all state objects from the beginning and never destroy them. If the state object is relatively large, the first method can be used to save memory, which can avoid creating some objects that will not be used and recycle them in time. However, if the state changes frequently, it is best to create all these state objects in the first place, and there is no need to destroy them, because they may be used again soon.