Question

Write a class named ParkingMeter containing: Two instance variables named timeLeft and maxTime of type int. The value of timeLeft should be initialized to 0. A constructor accepting a single integer parameter whose value is used to initialize the maxTime instance variable. A method named add that accepts an integer parameter. If the value of the parameter is equal to 25, the value of timeLeft is increased by 30; otherwise no increase is performed. Furthermore, the increase occurs only if the value of timeLeft will not exceed the value of maxTime. add returns a boolean value: true if timeLeft was increase, false otherwise. A method named tick that accepts no parameters and returns no value. tick decreases the value of timeLeft by 1, but only if the value of timeLeft is greater than 0. A method named isExpired that accepts no parameters. isExpired returns a boolean value: true if the value of timeLeft is equal to 0; false otherwise.

Answer 1

The answer for the given question is explained below.

Explanation:

public class Parking Meter  

{  

int time Left = 0;

int max Time;  

public Parking Meter( int max ){  

max Time = max;  

}  

public boolean add ( int coin )  

{  

  if ( coin == 25 )  

  {

   if ( time Left + 30 < max Time )

   {

    time Left += 30;

    return true;

   }

  }  

  return false;  

}  

public void tick()  

{

if ( time Left > 0 )

{

 time Left -= 1;

}  

}  

public boolean  is Expired()  

{

return time Left == 0;  

}

}