日语一级在日本生活

　　直到有一天，朱俐发现了那封早就落在自己家中的信件的秘密，竟然和仁俊有关，她决定将这个秘密收藏起来……我们为什么要这麼做……？ 哈尔希洛回过神来，才发现自己身处在黑暗当中，他完全不知道自己人在何处，也不明白这个地方是哪里。 他的身边有一群和他一样失去记忆，只记得自己名字的男女；而离开了地底後，等待著众人的是一个「宛如游戏」的世界。为求生存，哈尔希洛与自己有著相同境遇的夥伴们组成队伍、学习技能，以义勇兵见习者的身分踏入了这个世界--「格林姆迦尔」。没有人知道未来会遇见什麼……这一切，就是从灰烬之中所诞生的冒险谭。可是，眼下不能不想了。嗨呦，咱谁不知谁做什么买卖。　　海外民众戏言：警察黑道拜关公，妈祖庇护打渔翁，黎民祭拜大道公。医神保生大帝吴夲与瘟君成了同门师兄，千年斗法。天庭如人间，小人这就舒服多了。D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program: