[명품JAVA프로그래밍] 4장 실습문제 12번

import java.util.Scanner;

class Concert{
	private String name;
	
	Concert(){
		name = null;
	}
	
	public String getName() {
		return name;
	}
	
	public void cancel() {
		name = null;
	}
	
	public void reserve(String name) {
		this.name = name;
	}
	
	public boolean isOccupied() {
		if(name == null) {
			return false;
		}
		else {
			return true;
		}
	}
	
	public boolean match(String name) {
		return(name.equals(this.name));
	}
}

public class ConcertReservation{
	private char type;
	private Concert[] c;
	
	ConcertReservation(char type,int num){
		this.type = type;
		c = new Concert[num];
		for(int i=0;i<c.length;i++) {
			c[i] = new Concert();
		}
	}
	
	public boolean reserve() {
		Scanner sc = new Scanner(System.in);
		int seatNum;
		String name;
		show();
		System.out.print("이름>>");
		name = sc.next();
		System.out.print("번호>>");
		seatNum = sc.nextInt();
		
		if(seatNum<1||seatNum>=c.length) {
			System.out.println("잘못된 좌석 번호입니다.");
			return false;
		}
		
		//이미 예약된 좌석 번호
		if(c[seatNum-1].isOccupied()) {
			System.out.println("이미 예약된 좌석입니다.");
			return false;
		}
		c[seatNum-1].reserve(name);
		return true;
	}


	public boolean cancel() {
		Scanner sc = new Scanner(System.in);
		String name;
		show();
		System.out.print("이름>>");
		name = sc.next();
		if(name != null) {
			for(int i=0;i<c.length;i++) {
				if(c[i].match(name)) {
					c[i].cancel();
					return true;
				}
			}
			System.out.println("예약자 이름을 찾지 못함");
		}
		return false;
	}
	
	public void show() {
		System.out.print(type+">>");
		for(int i=0;i<c.length;i++) {
			if(c[i].isOccupied()) {
				System.out.print(c[i].getName());
			}
			else {
				System.out.print("---");
			}
			System.out.print(" ");
		}
		System.out.println();
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		ConcertReservation s = new ConcertReservation('S',10);
		ConcertReservation a = new ConcertReservation('A',10);
		ConcertReservation b = new ConcertReservation('B',10);
		
		System.out.println("명품예약 콘서트홀 예약 시스템입니다.");
		while(true) {
			System.out.print("예약:1, 조회:2, 취소:3, 끝내기:4>>");
			int num = sc.nextInt();
			switch(num) {
			case 1:
				System.out.print("좌석 구분 S(1), A(2), B(3)>>");
				int typeNum = sc.nextInt();
				if(typeNum<1||typeNum>3) {
					System.out.println("잘못 입력하셨습니다.");
					System.out.print("좌석 구분 S(1), A(2), B(3)>>");
					typeNum = sc.nextInt();
				}
				
				if(typeNum==1) {
					s.reserve();
				}
				else if(typeNum==2) {
					a.reserve();
				}
				else if(typeNum==3) {
					b.reserve();
				}
				break;
				
			case 2:
				s.show();
				a.show();
				b.show();
				System.out.println("<<<조회를 완료하였습니다.>>>");
				break;
				
			case 3:
				System.out.print("좌석 구분 S(1), A(2), B(3)>>");
				typeNum = sc.nextInt();
				if(typeNum<1||typeNum>3) {
					System.out.println("잘못 입력하셨습니다.");
					System.out.print("좌석 구분 S(1), A(2), B(3)>>");
					typeNum = sc.nextInt();
				}
				
				if(typeNum==1) {
					s.cancel();
				}
				else if(typeNum==2) {
					a.cancel();
				}
				else if(typeNum==3) {
					b.cancel();
				}
				break;
			case 4:
				return;
			default:
				System.out.println("없는 번호입니다.");
				System.out.println("다시 번호를 입력해주세요");
			}
		}
	}
}

결과

명품예약 콘서트홀 예약 시스템입니다.
예약:1, 조회:2, 취소:3, 끝내기:4>>1
좌석 구분 S(1), A(2), B(3)>>1
S>>--- --- --- --- --- --- --- --- --- --- 
이름>>황기태
번호>>1
예약:1, 조회:2, 취소:3, 끝내기:4>>1
좌석 구분 S(1), A(2), B(3)>>2
A>>--- --- --- --- --- --- --- --- --- --- 
이름>>김효수
번호>>5
예약:1, 조회:2, 취소:3, 끝내기:4>>2
S>>황기태 --- --- --- --- --- --- --- --- --- 
A>>--- --- --- --- 김효수 --- --- --- --- --- 
B>>--- --- --- --- --- --- --- --- --- --- 
<<<조회를 완료하였습니다.>>>
예약:1, 조회:2, 취소:3, 끝내기:4>>3
좌석 구분 S(1), A(2), B(3)>>2
A>>--- --- --- --- 김효수 --- --- --- --- --- 
이름>>김효수
예약:1, 조회:2, 취소:3, 끝내기:4>>2
S>>황기태 --- --- --- --- --- --- --- --- --- 
A>>--- --- --- --- --- --- --- --- --- --- 
B>>--- --- --- --- --- --- --- --- --- --- 
<<<조회를 완료하였습니다.>>>
예약:1, 조회:2, 취소:3, 끝내기:4>>4

 

너무 어려워서 인터넷에서 정답지 찾아서 보강했다

3번 더 풀어봐야겠다