java check if string is empty

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AI 回答 由 glm-4-flash 生成 · 仅供参考,请自行核实
1. 使用 `isEmpty()` 方法:`str.isEmpty()`
2. 使用 `length()` 方法:`str.length() == 0`
3. 使用正则表达式:`str.matches("\\s*")`

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