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### Relevant Articles: ### Relevant Articles:
- [Retain Only Digits and Decimal Separator in String](https://www.baeldung.com/java-string-retain-digits-decimal) - [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)