/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args)
	{
		SonicAirplane sa = new SonicAirplane();
		sa.takeOff();
		sa.fly();
		sa.flyMode = SonicAirplane.SONIC;
		sa.fly();
		sa.flyMode = SonicAirplane.NORMAL;
		sa.fly();
		sa.land();
	}
}
 
//일반적인 비행기를 나타낸 클래스- 공통
class Airplane{
	public void land(){
		System.out.println("착륙합니다.");
	}
	public void fly(){
		System.out.println("일반모드로 비행합니다");
	}
	public void takeOff(){
		System.out.println("이륙합니다");
	}
}
 
//음속 비행기를 나타낸 클래스 - 상속
class SonicAirplane extends Airplane{
	public static final int NORMAL = 1;
	public static final int SONIC = 2;
 
	//비행 모드를 저장하는 변수
	public int flyMode = NORMAL;
 
	@Override
	public void fly(){
		if(flyMode==SONIC){
			System.out.println("음속모드로 비행합니다");
		}else{
			//부모인 Airplane 객체의 fly() 메소드 호출
			super.fly();
		}
	}
}

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