다음 오라클 공식 문서와 Effective Java 서적을 참고하여 공부했습니다. https://docs.oracle.com/javase/tutorial/java/javaOO/nested.html Nested Classes (The Java™ Tutorials > Learning the Java Language > Classes and Objects) 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 avail..
