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Attacker: The computer used by the attacker is the attack console, which can be any host on the network or even an active laptop. The attacker manipulates the whole attack process and sends attack commands to the master.紫茄惊异万分，道：你真不是来杀人的？秦霖忍俊不禁道：你不放心，再用迷药迷倒我就是了。你表露了身份，命都不一定保得住，上哪认祖归宗？板栗也摇头道：不妥。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:这年秋天，从未想过会一个人生活的方佳莹(孙可芳饰)和交往三年的男友杨大和(林子閎饰)分手了。佳莹藉工作麻痺自己，在一场以出差為名的疗伤之旅中，她邂逅了一枚在她认知裡的头号怪胎──丁志明(宋柏纬饰)。$(document). Ready () {Reference: Baidu Encyclopedia-iPhone