public class BusinessObject {
	int currentPos;
	User[] users;
	PropertiesUtil proutil;
	
	public BusinessObject(){
		currentPos = 0;
		proutil = new PropertiesUtil("telephone.properties");
		users = getAllUsers();
	}
	
	public void saveUser(User user){
		proutil = new PropertiesUtil("telephone.properties");
		String key = user.getNo();
		proutil.setProperties(key+".no", key);
		proutil.setProperties(key+".sex", user.getSex());
		proutil.setProperties(key+".name", user.getName());
		proutil.setProperties(key+".age", user.getAge().toString());
		proutil.setProperties(key+".phone", user.getPhone());
		proutil.setProperties(key+".imagePath", user.getImagePath());
		proutil.save();
		users = getAllUsers();
	}
	
	public User first(){
		currentPos = 0;
		return users[currentPos];
	}
	
	public User next(){
		if(currentPos<users.length-1){
			currentPos++;
			return users[currentPos];
		}
		return users[currentPos];
	}
	
	public User previous(){
		if(currentPos > 0){
			currentPos--;
			return users[currentPos];
		}
		return users[currentPos];
	}
	
	public User last(){
		currentPos = users.length-1;
		return users[currentPos];
	}
	
	private User[] getAllUsers() {
		
		String[] keys = proutil.getAllKeys();
		User[] users = new User[keys.length];
		for(int i=0;i<keys.length;i++){
			User u = new User();
			u.setNo(proutil.read(keys[i]+".no"));
			u.setName(proutil.read(keys[i]+".name"));
			u.setAge(new Integer(proutil.read(keys[i]+".age")));
			u.setPhone(proutil.read(keys[i]+".phone"));
			u.setImagePath(proutil.read(keys[i]+".imagePath"));
			u.setSex(proutil.read(keys[i]+".sex"));
			users[i] = u;
		}
		return users;
	}
	
}