엘리베이터 실습예제

추상클래스 생성

public abstract class Lift {
//층수는 고정되어야 하니까 스테틱으로 사용
static int floor =0;
abstract void up();
abstract void down();
abstract void start(int choice);
abstract void stop();
abstract void go();
}

public class Elevator extends Lift{

final int maxFloor=10;
final int minFloor= -3;

@Override
void up() {
	floor++;
	
}

@Override
void down() {
	floor--;
	
}

@Override
void start(int choice) {
	if(choice < floor) {
		for (int i = 0; i < floor-choice+i; i++) {
			if(floor != 0) {
				System.out.println(floor+"층");
				try {
					Thread.sleep(1000);
				}catch(InterruptedException e) {}
			}
			down();
		}
		stop();
	}else if(choice != floor) {
		for (int i = 0; i <= choice - floor+i; i++) {
			if(floor!=0) {
				System.out.println(floor+"층");
			}
			up();
		}
		stop();
	}else {
		System.out.println("같은 층 선택불가");
	}
	
}

@Override
void stop() {
	System.out.println("$$도착$$");
	
}

@Override
void go() {
	int choice =0;
	String msg="";
	while(true){
		msg="층수를 입력하세요(현재층 :" + floor + "층)";
		System.out.println(msg);
		choice=new Scanner(System.in).nextInt();
		if(choice > maxFloor || choice < minFloor) {
			System.out.println("지하3층 부터 지상 10층 까지 운행합니다.");
		}else {
			break;
		}
		
	}
	start(choice);
	
}

}

실행

public class Building {

public static void main(String[] args) {
	Elevator e = new Elevator();
	
	Random r = new Random();
	int cnt;
	int floor=0;
	String check="";
	int[] arElevator = new int[5];
	
	cnt = r.nextInt(6);
	for (int i = 0; i < cnt; i++) {
		arElevator[i]=1;
	}
	
	while(true) {
		//최대 :10층
		//최저 :-3층
		floor=r.nextInt(e.maxFloor+(e.minFloor*-1)+1)+e.minFloor;//14가 나와야함
		if(floor!=0) break;
	}
	if(cnt==0) {
		System.out.println("현재 탑승 인원 : 없음(최대5명)");
	}else {
		System.out.println("현재 탑승 인원 :" + cnt + "명(최대5명)");
	}
	System.out.println("Y : 타기            N: 보내기");
	check = new Scanner(System.in).next().toUpperCase();//소문자를 입력해도 대문자로 변경해줌
	if(check.equals("Y")) {
		cnt++;
		try {
			arElevator[cnt-1] = 1;
			Elevator.floor = floor;
			e.go();
		} catch (Exception e1) {
			System.out.println("정원초과");
			
		}
	}
}

}