UserStatistics.java

UserStatistics.java

package cc.aaron67.test;

import java.util.ArrayList;
import java.util.List;

public class UserStatistics {

	private static List<User> userList;

	public static void main(String[] args) {
		init();
		int start = 3, end = 11;
		ArrayList<ArrayList<User>> list = new ArrayList<ArrayList<User>>();
		for (int i = 0; i < end - start; ++i) {
			list.add(new ArrayList<User>());
		}
		for (int i = 0; i < userList.size(); ++i) {
			for (int j = 0; j < list.size(); ++j) {
				String startTime = intToTime(start + j), endTime = intToTime(start + j + 1);
				if (userList.get(i).loginTime.compareTo(startTime) >= 0
						&& userList.get(i).loginTime.compareTo(endTime) < 0
						|| userList.get(i).logoutTime.compareTo(startTime) > 0
						&& userList.get(i).logoutTime.compareTo(endTime) <= 0
						|| userList.get(i).loginTime.compareTo(startTime) < 0
						&& userList.get(i).logoutTime.compareTo(endTime) > 0
						|| userList.get(i).loginTime.compareTo(startTime) >= 0
						&& userList.get(i).logoutTime.compareTo(endTime) < 0) {
					list.get(j).add(userList.get(i));
				}
			}
		}

		int i = 0;
		while (i < list.size()) {
			int j = i + 1;
			while (j < list.size() && list.get(i).equals(list.get(j))) {
				++j;
			}
			if (list.get(i).size() != 0) {
				System.out.println("[" + (start + i) + ", " + (start + j) + ") "
						+ list.get(i).size());
			}
			i = j;
		}

		System.out.println("-----------------");
		for (int k = 0; k < list.size(); ++k) {
			System.out.print((start + k) + " ~ " + (start + k + 1) + ": ");
			for (int j = 0; j < list.get(k).size(); ++j) {
				System.out.print(list.get(k).get(j).name + " ");
			}
			System.out.println();
		}
	}

	private static void init() {
		userList = new ArrayList<User>();
		userList.add(new User("A", "05:37", "09:01"));
		userList.add(new User("B", "07:13", "08:00"));
		userList.add(new User("C", "05:00", "07:00"));
	}

	private static String intToTime(int i) {
		if (i / 10 == 0) {
			return "0" + i + ":00";
		} else {
			return i + ":00";
		}
	}
}

class User {

	public String name;
	public String loginTime;
	public String logoutTime;

	User(String n, String login, String logout) {
		name = n;
		loginTime = login;
		logoutTime = logout;
	}

}

Great God Zhou is awesome~~