需求分析：顯示房間狀態、訂房、退房。

需要三個類：測試類、酒店類、房間類

房間類有三個attribute：房間編號、房間類型、房間狀態

酒店類三個operation：顯示房間狀態、訂房、退房

public class Room {private int no;private String type;private boolean occupancy;public int getNo(){return no;}public void setNo(){this.no = no;}public String getType(){return type;}public void setType(String type){this.type = type;}public boolean getOccupancy(){return occupancy;}public void setOccupancy(boolean occupancy){this.occupancy = occupancy;}public Room(int no,String type,boolean occupancy){this.no = no;this.type = type;this.occupancy = occupancy;}public String toString(){String str = occupancy ? "占用" : "空閑";return "[no="+no+",房型="+type+",狀態"+str+"]";} } public class Hotel {Room[][] rooms;public Hotel(){rooms = new Room[3][9];//3層，每層9個房間//給房間編號for(int i = 0;i < rooms.length ;i++){for(int j = 0;j < rooms[i].length;j++){//一樓單人間，二樓標準間，三樓豪華間if(i==0){rooms[i][j] = new Room((i+1)*100+j+1,"單人間",false);}if(i==1){rooms[i][j] = new Room((i+1)*100+j+1,"標準間",false);}if(i==2){rooms[i][j] = new Room((i+1)*100+j+1,"豪華間",false);}}}}public void display(){for(int i = 0;i < rooms.length;i++){for(int j =0;j < rooms[i].length;j++){if(j%3==0){//每行顯示3個房間信息System.out.println();}System.out.print(rooms[i][j]+"\t");}}}public void reserve(int no){for(int i = 0;i < rooms.length;i++){for(int j =0;j < rooms[i].length;j++){if(rooms[i][j].getNo()==no){rooms[i][j].setOccupancy(true);System.out.println("預定成功！您預定的房間編號為："+no);return;}}}}public void checkout(int no){for(int i = 0;i < rooms.length;i++){for(int j =0;j < rooms[i].length;j++){if(rooms[i][j].getNo()==no){rooms[i][j].setOccupancy(false);System.out.println("您已成功退掉："+no+"號房！");return;}}}}public boolean getRoomOccupancy(int no){for(int i = 0;i < rooms.length;i++){for(int j =0;j < rooms[i].length;j++){if(rooms[i][j].getNo()==no){return rooms[i][j].getOccupancy();}}}System.out.println("您輸入的房間不存在！");return false;} } import java.util.*; public class Test {public static void main(String[] agrs){Scanner input = new Scanner(System.in);Hotel hotel = new Hotel();int no;System.out.println("-------------------歡迎來到XX酒店-------------------");while(true){System.out.println("請選擇服務(輸入數字）：1、查詢房間情況 2、預定房間 3、退房");switch(input.nextInt()){case 1:{System.out.println("------------------- 酒店房間情況--------------------");hotel.display();break;}case 2:{while(true){try{System.out.println("請輸入您想要入住的房間編號");no = input.nextInt();if(hotel.getRoomOccupancy(no)){System.out.println("對不起，該房間已有人入住，請重新選擇！");}else{hotel.reserve(no);break;}}catch(Exception e){System.out.println("您輸入的信息有誤，請重新進入系統！");}}break;}case 3:{while(true){try{System.out.println("請輸入您想退的房間號");no = input.nextInt();if(hotel.getRoomOccupancy(no)){hotel.checkout(no);break;}else{System.out.println("該房間無人入住，請重新輸入！");}}catch(Exception e){System.out.println("您輸入的信息有誤，請重新進入系統！");}}break;}}System.out.println("\n按任意鍵繼續使用，按q退出");if(input.next().charAt(0)=='q'){break;}}} }

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