Update README.md

2021-06-17 00:51:09 +08:00 · 2021-06-17 00:51:09 +08:00 · 46b06811fb
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@ -10,3 +10,4 @@ This module contains articles about Java 9 core features
 - [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
 - [Immutable ArrayList in Java](https://www.baeldung.com/java-immutable-list)
 - [Easy Ways to Write a Java InputStream to an OutputStream](https://www.baeldung.com/java-inputstream-to-outputstream)
+- [Private Methods in Java Interfaces](https://www.baeldung.com/java-interface-private-methods)