scala for the impatient excercise 5

// ex1
class Counter {
	private var value = 0 
	def increment() { 
		if (value != Int.MaxValue)
			value += 1 
	} 
}

// ex2
class BankAccount {
	private var _balance = 0

	def deposit(amt : Int){
		_balance += amt
	}

	def withdraw(amt : Int)	{
		if (amt <= _balance){
			_balance -= amt
		}
	}

	def balance = _balance
}

class Time {
	private var _hours = 0
	private var _minutes = 0
	private var _sinceMidnight = 0

	def hours = _hours
	def minutes = _minutes 
	def sinceMidnight = _sinceMidnight

	def this(setHours: Int, setMins: Int){
		this()
		if (setHours >= 0 & setHours <= 23)
			_hours = setHours
		if (setMins >= 0 & setMins <= 59)
			_minutes = setMins
		_sinceMidnight = _hours * _minutes
	}

	def before(other: Time): Boolean = {
		if (other.hours > _hours)
			return true
		else if (other.hours < _hours)
			return false
		else if (other.minutes <= _minutes)
			return false
		else
			return true
	}
}