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兄弟两人各自代表自己的阶级开始了针锋相对的对抗。两人明里是好兄弟，暗中使出浑身解数，对抗不断升级。　　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://Code InitializationThe meta-sharing mode uses sharing technology to effectively support fine-grained objects and make them share. In the. NET class library, the implementation of the String class uses the meta-sharing mode, and the String class uses the string resident pool to share strings. For more information, please refer to the blog post: http://www.cnblogs.com/artech/archive/2010/11/25/internedstring.html. The specific structure diagram of the element-sharing mode is shown below.Although it can weaken the connection between objects, if it is overused, it will make the code difficult to understand and maintain, etc.