https://docs.oracle.com/javase/tutorial/java/concepts/index.html
Lesson: Object-Oriented Programming Concepts (The Java™ Tutorials > Learning the Java Language)
The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available. See JDK Release Notes for information about new fe
docs.oracle.com
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