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* Creation * Moved code from https://www.baeldung.com/java-marker-interfaces * Moved code from https://www.baeldung.com/java-abstract-class * Moved code from https://www.baeldung.com/java-this * Moved code from https://www.baeldung.com/java-nested-classes * Moved code from https://www.baeldung.com/java-inner-interfaces * Moved code from https://www.baeldung.com/java-classes-objects * Moved article references to the new README.md