/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
 
class C1{
    static int static_variable = 1;
	int instance_variable = 2;
	static void static_static(){
		System.out.println(static_variable);
	}
	static void static_instance(){
		// 클래스 메소드에서는 인스턴스 변수에 접근 할 수 없다. 
		//System.out.println(instance_variable);
	}
	void instance_static(){
		// 인스턴스 메소드에서는 클래스 변수에 접근 할 수 있다.
		System.out.println(static_variable);
	}
	void instance_instance(){		 
		System.out.println(instance_variable);
	}
}
class ClassMemberDemo {	
	public static void main(String[] args) {
		C1 c = new C1();
		// 인스턴스를 이용해서 정적 메소드에 접근 -> 성공
		// 인스턴스 메소드가 정적 변수에 접근 -> 성공
		c.static_static();
		// 인스턴스를 이용해서 정적 메소드에 접근 -> 성공
		// 정적 메소드가 인스턴스 변수에 접근 -> 실패
		c.static_instance();
		// 인스턴스를 이용해서 인스턴스 메소드에 접근 -> 성공
		// 인스턴스 메소드가 클래스 변수에 접근 -> 성공
		c.instance_static();
		// 인스턴스를 이용해서 인스턴스 메소드에 접근 -> 성공 
		// 인스턴스 메소드가 인스턴스 변수에 접근 -> 성공
		c.instance_instance();
		// 클래스를 이용해서 클래스 메소드에 접근 -> 성공
		// 클래스 메소드가 클래스 변수에 접근 -> 성공
		C1.static_static();
		// 클래스를 이용해서 클래스 메소드에 접근 -> 성공
		// 클래스 메소드가 인스턴스 변수에 접근 -> 실패
		C1.static_instance();
		// 클래스를 이용해서 인스턴스 메소드에 접근 -> 실패
		//C1.instance_static();
		// 클래스를 이용해서 인스턴스 메소드에 접근 -> 실패
		//C1.instance_instance();
	}
 
}

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