Also, you can further organize your packages into Java modules (Java >=9). I don't know why people say that you can't use composition in Java or that it is uni

Also, you can further organize your packages into Java modules (Java >=9). I don't know why people say that you can't use composition in Java or that it is unique to purely functional languages. You can achieve composition by using Streams, decorator, composite and chain of responsability patterns.