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a guest Jan 27th, 2020 89 Never
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  1. public class GasTank
  2. {
  3.   // Gas tank has two instance variables (fields, attributes etc)
  4.   // that keeps track of the amount of gasoline
  5.   // in the tank and it's total capacity. They can be decimals.
  6.  
  7.   private double capacity = 0;
  8.   private double gas = 0;
  9.  
  10.   /**
  11.    * Default constructor that sets the amount of gas to zero.
  12.    */
  13.   public GasTank(double capacity)
  14.   {
  15.  
  16.     capacity = 0;
  17.  
  18.   }
  19.  
  20.   /**
  21.    * bumps up the amount of gas in the gas tank by amount, but will not exceed
  22.    * the capacity of the gas tank.
  23.    *
  24.    * @param amount
  25.    */
  26.   public void addGas(double amount)
  27.   {
  28.     gas += amount;
  29.  
  30.   }
  31.  
  32.   /**
  33.    * Removes the gas from the gas tank by amountUsed. You can't have negative
  34.    * gas!! so if the client uses more than what's in the tank then keep it zero.
  35.    *
  36.    * @param amountUsed
  37.    */
  38.   public void useGas(double amountUsed)
  39.   {
  40.  
  41.     if (amountUsed <= gas)
  42.     {
  43.       gas -= amountUsed;
  44.     }
  45.     else
  46.     {
  47.       gas = 0;
  48.     }
  49.  
  50.   }
  51.  
  52.   /**
  53.    * Tank is empty if we have less than 0.1 gallons of gas. So person has chance
  54.    * to run to the gas station before they are really out.
  55.    *
  56.    * @return
  57.    */
  58.   public boolean isEmpty()
  59.   {
  60.  
  61.     if (gas < 0.1)
  62.     {
  63.       return true;
  64.     }
  65.  
  66.     return false;
  67.   }
  68.  
  69.   /**
  70.    * The gas tank is full if the amount is within 0.1 gallons of the total
  71.    * capacity of the tank.
  72.    *
  73.    * @return
  74.    */
  75.   public boolean isFull()
  76.   {
  77.     return gas >= 0.1 + capacity;
  78.   }
  79.  
  80.   /**
  81.    * Fills up the tank but ALSO returns the amount of gas it took to fill up the
  82.    * tank to capacity. Remember there might already be some gas in the tank.
  83.    *
  84.    * @return
  85.    */
  86.   public double fillUp()
  87.   {
  88.     // TODO: Add code here.
  89.     double gasDifference = capacity - gas;
  90.     gas = capacity;
  91.     return gasDifference;
  92.   }
  93.  
  94.   /**
  95.    * Just a simple getter that returns the amount of gas in the gas tank.
  96.    *
  97.    * @return
  98.    */
  99.   public double getGasLevel()
  100.   {
  101.     // TODO: Add code here.
  102.     return gas;
  103.   }
  104.  
  105. }
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