> 原文:[https://www . geesforgeks . org/treeset-retain all-method-in-Java-with-example/](https://www.geeksforgeeks.org/treeset-retainall-method-in-java-with-example ...
> 原文:[https://www . geesforgeks . org/treeset-remove all-in-Java-method-with-example/](https://www.geeksforgeeks.org/treeset-removeall-method-in-java-with-example ...
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