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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:Select can be included in an event, but its result disappears as if it had not been executed.秦淼感激地说道：板……大哥真是心细。The Adapter class inherits the Source class and implements the Targetable interface. The following is the test class:韩信一颗心如同坠入冰窖之中，难以置信道：陈大娘，什么的时候的事情？来的都是些什么人您知道吗？陈大娘有些不解，疑惑道：难道人不是你派来的？韩信摇摇头，继续追问。