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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:Now is the best time to dye persimmons, because persimmons are green and rich in tannins. Persimmon dyed fabrics are crisp and anticorrosive, and will not have peculiar smell after sweating. The color will deepen after sun exposure, also known as "sun dye".(5) Number, position and dynamics of ships detected by radar;在家长重重压力下想要离家出走的大雄（大原惠美 配音）、胖虎（木村昴 配音）、小夫（关智一 配音）和静香（嘉数由美 配音），在哆啦A梦（水田山葵 配音）的协助下来到了七万年前的地球。在创造属于自己的世外桃源时，他们偶遇神秘少年古古儿，继而被卷入了光明族和黑暗族的部落争斗之中。大家齐心协力智斗巨尊比，不想却发现了一个惊天秘密……板栗不自觉地抖了一下，叫道：你甭朝我翻眼了。Power varies with race:陆飞，司马战歌，张小武三个性格迥异的年青人，在军营里相识。他们参军的目的各有不同：陆飞只是为了爸爸承诺的五百万奖金；司马却是想得到一个城里人的身份；而胆小懦弱的张小武却是被母亲“逼迫”入伍。其实小武母亲张丽芳已患上绝症，她这么做，是为了让儿子尽早学会独立。军营的锤炼，让这三个年青人成为生死与共的亲密战友，并携手当上了特种兵。母亲的离世，让张小武的行为变得乖僻，最终被部队除名。但陆飞和司马并不知道，性格大变的张小武其实肩负着祖国一项艰巨任务。公海拯救行动中，陆飞终于发现张小武的真实身份，危机时刻，陆飞用生命保护了小武，以及小武身上的秘密。