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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:1931年夏，从西山女中毕业的林道静为了追求自由，选择了抗婚出逃，走投无路的她觉得天下之大却没有她的容身之所，茫然之下想要投海自尽，被大学生余永泽救回。热情而多才的余永泽一下子感动了林道静。在北平，林道静结识了进步学生、共产党员卢嘉川、江华等人，明白了许多革命救国的道理。而在这些问题上，余永泽却和自己有着截然不同的观点。在一次学生运动中，卢嘉川因为余永泽的不肯帮助而遭到被捕。林道静毅然离开了余永泽，加入到了风起云涌的爱国学生运动中。当局一次次的陷害和逮捕让林道静成长为一名成熟的学生运动领袖。在又一次的爱国游行运动中，林道静走在队伍的最前列。古老的中华大地，回荡着这代青年用鲜血和生命谱写的青春之歌。无名无姓的，让人怎么帮你报信儿？没见过这么奇怪的访客，这也就是玄武王府，要是别的府邸，早把人赶走了。土狗子的皮就分给她们了。先前一番对话过后，他已肯定杨长帆绝非妄人，是真的心系百姓安危。请命随军同行，顷刻之间，杭州精兵能将抽掉了大半。