java room management of small projects
This small room management project for java beginners practiced hand. Function, while small, but the content is complete!
Like this article can follow me, I will continue to update, update your concerns are my motivation! For more java learning materials may also private letter I!
I wish my people are concerned about: good health, plenty of money, welfare, such as the East China Sea, many happy returns, Taoyuan County, from not afford to send! 
There are five layers, each 10 rooms, digital 101--509 mark;
with a check check-out, search, quit four simple functions;
public class Hotel {
static final int floor = 5;
static final int order = 10;
private static int countFloor;
private static int countOrder;
private static String[][] rooms = new String[floor][order];
Basic functions // main function on behalf of the hotel, check-in, check-out, query, other;
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
String temp = null;
while(true){
// alert the user to select the input
System.out.println ( "Please select an input in out search quit:");
temp = scan.next();
int room = 0;
if("in".equals(temp)){
while(true){
System.out.println ( "Please enter the room number:");
room = scan.nextInt();
if(isRightRoom(room,1)){
break;
}
}
System.out.println ( "Enter name:");
String name = scan.next();
if(in(room,name)){
System.out.println ( "Congratulations, stay successful");
System.out.println(room + " : "+name);
}
}else if("out".equals(temp)){
while(true){
System.out.println ( "Please enter the room number:");
room = scan.nextInt();
if(isRightRoom(room,0)){
break;
}
}
if(out(room)){
System.out.println ( "check-out success, welcome to the next visit");
}
}else if("search".equals(temp)){
System.out.println ( "Please enter the room number of (-1 means all)");
room = scan.nextInt();
search(room);
}else if("quit".equals(temp)){
break;
}else{
System.out.println ( "Your input is incorrect, please re-enter!");
}
}
}
// flag: 1 Check the room number and enter the correct unoccupied 0 check only enter the correct room number
private static boolean isRightRoom(int room,int flag) {
// check the room number is entered incorrectly
countFloor = room / 100 - 1;
countOrder = room % 100 - 1;
if(countFloor < 0 || countFloor >= floor || countOrder < 0 || countOrder >= order ){
System.out.println ( "Enter the room number wrong");
return false;
}
if(flag == 1){
if(rooms[countFloor][countOrder] != null){
System.out.println ( "rooms have been living in");
return false;
}
}
return true;
}
// hotel occupancy function realization, in (room, name) countFloor: calculated floor countOrder: the calculated room order
private static boolean in(int room,String name){
rooms[countFloor][countOrder] = name;
return true;
}
// Check the hotel function realization, out (room),
private static boolean out(int room){
// check whether someone check the room number
if(rooms[countFloor][countOrder] == null){
System.out.println ( "never room and check-out wrong");
return false;
}
rooms[countFloor][countOrder] = null;
return true;
}
// hotel search, search (room)
private static void search(int room){
if(room == -1){
int roomNum = 0;
for(int i=0;i<floor;i++){
for(int j=0;j<order;j++){
roomNum = (i + 1) * 100 + j + 1;
System.out.println(roomNum + "->" +
(rooms[i][j] == null ? "empty" : rooms[i][j]));
}
}
}else{
// check the room number is correct
if(!isRightRoom(room,0)){
System.out.println ( "Sorry, wrong room enter!");
}else{
System.out.println(rooms[countFloor][countOrder]);
}
}
}}