Write a class Battery that models a rechargeable battery. A battery has a constructor

public Battery(double capacity)

where capacity is a value measured in milliampere hours. A typical AA battery has a capacity of 2000 to 3000 mAh. The method

public void drain(double amount)

drains the capacity of the battery by the given amount. The method

public void charge()

charges the battery to its original capacity. The method

public double getRemainingCapacity()

gets the remaining capacity of the battery.