imported>Unknown at 05:23, 7 February 2021

2021-02-07T05:23:33Z

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innerclass 에서는 기본적으로 Inner Class 를 포함하고 있는 상위클래스의 레퍼런스가 생성자로 들어간다. 마치 C++ 에서 메소드들에 대해 this 가 기본 파라메터로 넘어가는 것과 같은 이치랄까.

import java.lang.reflect.Constructor;

public class InnerConstructorTest {
public static void main(String[] args) {
try {
Class outerClass = Class.forName("Outer");
Object outer = outerClass.newInstance();
Class innerClass = Class.forName("Outer$Inner");
Class[] consParamClasses = new Class[]{outerClass};
Constructor innerCons =
innerClass.getDeclaredConstructor(consParamClasses);
Object[] consParams = new Object[]{outer};
Object inner = innerCons.newInstance(consParams);
System.out.println(inner.toString());
} catch (Exception e) {
System.out.println("Exception: " + e.getMessage());
}
}
}

class Outer {
int y = 3;

class Inner {
public String toString() {
return "" + y;
}
}
}

Java/ReflectionForInnerClass - Revision history

imported>Unknown at 05:23, 7 February 2021