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If function selection when determining whether it is empty

2022-06-10 00:37:00 【Bobo】

1. Default , At this time, the three situations will be judged as false：
1. The value is an empty string "" if (0) ==false
2. The value is null if (“”) ==false
3. The value is 0. if (null) ==false
All three cases will be judged as false
If Do not want the value to be 0 When is false have access to StringUtils.isEmpty() function
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