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讲述了坠入爱河的性格截然不同的两名男高中生，一边纠结一边走完人生的故事。This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:哈哈哈。In the "Video Learning" section, there are the first video, short video, simulcast channel, theory, party history, massive open online course, characters, culture, literature and art, science, nature, TV series, movies, rule of law, military and other channels. Among them, the "first video" is mainly a video report on the relevant activities of General Secretary Xi Jinping. As its name implies, "simulcast channel" is CCTV news simulcast video. Massive open online course is a free public video course with a variety of courses.No. 80 Raisa Andriana