import java.util.Comparator;
public  class RoomComporator  implements Comparator<Room> {

public RoomComporator(){}


@Override
public int compare(Room r1, Room r2 ) {

return r1.square- r2.square;}

}

import java.util.List;
import java.util.Collections;
import java.util.LinkedList;

public class Room {

int length;
int width;
int square;


public int getWidth(){
    return this.width;
}

public void setWidth(int width){
    this.width = width;
}

public int getLength(){
    return this.length;
}

public int setLength(int length){
    return this.length = length;
}
public Room(int l, int w) {
    this.length = l;
    setWidth(w);
}
void square(){
    int l, w;
    l = length;
    w = width;

    int s = w*l;
    System.out.println(s);

}

Room (int square){
    this.square=square;
}


void printRoom(){
System.out.println(length   + "   " +   width);
}

public static void main(String[] args){

List<Room> rooms = new LinkedList <Room>();
int numRooms = 20;
int maxLength = 9;
int maxWidth = 9;



for( int i = 0; i < numRooms; i++)
{
    int length =  1 + (int)(Math.random()*maxLength);
    int width = 1 + (int)(Math.random()*maxWidth);
    Room r = new Room(length, width);
    System.out.println("Room " + (i + 1));
    r.printRoom();

    r.square();
    rooms.add(r);

}


for( int i = 0; i < numRooms; i++){
    Collections.sort(rooms, new RoomComporator());
    System.out.println(rooms.get(i).square);}

}
}