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2023-05-17 20:33:02 +08:00 · 2023-05-17 20:33:02 +08:00 · 1f9c1fdb37
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 ### Relevant Articles:
 - [Retain Only Digits and Decimal Separator in String](https://www.baeldung.com/java-string-retain-digits-decimal)
+- [Difference Between null and Empty String in Java](https://www.baeldung.com/java-string-null-vs-empty)