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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:Add the following code to "TestSpring":奉天承运皇帝诏曰……封汪滶为徽王，杨长帆为东海王，布告天下咸使闻知Only by keeping up with the trend of the times can Adidas be accepted by the market. Adidas, which launched this brand-new player sock, obviously takes into account the needs of the current players. For those players who like to match their "magic socks", the split design avoids the trouble of cutting the socks by themselves. However, it has good anti-skid and package performance. This sock allows more players to switch at any time during training and competition. Perhaps in the coming period of time, this brand-new Adidas player sock with separate design will become a new trend in the sock market.2, is to use a proxy class to call the original method, and control the results. This method is the proxy mode./smell