如何在Java中创建几个整数和一个输入整数的“最佳拟合”比较？

Question

我有3个房间（将来可能会有更多的房间，但这是不相关的），所有房间都有不同数量的座位（假设这些是“房间”对象）：

然后，我输入需要预订的座位数的值，然后我的代码将根据用户的输入自动为用户分配一个房间，其中包含“最适合”的房间或能够容纳最适合其需求的座位的最接近数量的房间。所以一些例子

（假设输入不会超过30）如果输入超过30，我会做其他事情，这与这个问题无关。

所以这是我的尝试：

returnValue = 0;
inputValue = 10; //can be anything, doesn't have to be 10
ArrayList<Room> rooms= new ArrayList<Room>(); //where each room is already in the array list identified by it's unique number 

//assume getRoomNumber() returns the room number of the Room object
// assume getRoomSeats() returns the number of seats of a Room object

for (Room i: rooms){

    if (i.getRoomSeats()==inputValue){

        returnValue = i.getRoomNumber();
    }
    elif(i.getRoomSeats()<inputValue){//donothing}

    elif(i.getRoomSeats()>inputValue){

        returnValue = i.getRoomNumber;

}}}

这是我想要的最好的方式吗？

Answer 1

你可以这样做

import java.util.ArrayList;
import java.util.Comparator;

public class Main {

    public static void main(String[] args) {
        new Main().test();
    }

    void test() {
        int inputValue = 22;

        ArrayList<Room> rooms = new ArrayList<Room>(); // where each room is already in the array list identified by
        rooms.add(new Room(10, 1));
        rooms.add(new Room(20, 2));
        rooms.add(new Room(30, 3));

        Integer currentDifference = null;
        Room roomWithMinimalDifference = null;

        for (Room room : rooms) {
            int difference = room.getRoomSeats() - inputValue;
            System.out.println("room "+room.getRoomNumber()+" difference "+difference);
            boolean roomFitsEnteredSeats = difference >= 0; //check if room fits the entered value

            if(roomFitsEnteredSeats) {
                if (currentDifference == null || difference < currentDifference) {
                    currentDifference = difference;
                    roomWithMinimalDifference = room;
                }
            }
        }

        if (roomWithMinimalDifference != null) {
            System.out.println("found room" + roomWithMinimalDifference.getRoomNumber() + " seats "
                    + roomWithMinimalDifference.roomSeats);
        } else {
            System.out.println("no room was found");
        }

        System.out.println("-----------------------");

        //========== or use this with java >= 8
        Room bestMatchingRoom = rooms.stream()
                .sorted(Comparator.comparingInt(Room::getRoomSeats))
                .filter(r -> r.getRoomSeats() >= inputValue)
                .findFirst()
                .orElse(null);

        if (bestMatchingRoom != null) {
            System.out.println("found room" + roomWithMinimalDifference.getRoomNumber() + " seats "
                    + roomWithMinimalDifference.roomSeats);
        } else {
            System.out.println("no room was found");
        }
    }

    class Room {
        int roomSeats;
        int roomNumber;

        public Room(int roomSeats, int roomNumber) {
            super();
            this.roomSeats = roomSeats;
            this.roomNumber = roomNumber;
        }

        public int getRoomSeats() {
            return roomSeats;
        }

        public void setRoomSeats(int roomSeats) {
            this.roomSeats = roomSeats;
        }

        public int getRoomNumber() {
            return roomNumber;
        }

        public void setRoomNumber(int roomNumber) {
            this.roomNumber = roomNumber;
        }
    }
}