Write a full class definition for a class named GasTank and

Write a full class definition for a class  named GasTank, and containing the following members:

A data member named amount of type  double .

A constructor that accepts no parameters . The constructor  initializes the data member amount to 0.

A function named addGas that accepts a parameter of type  double . The value of the amount instance variable is increased by the value of the parameter .

A function named useGas that accepts a parameter of type  double . The value of the amount data member is decreased by the value of the parameter . However, if the value of amount is decreased below 0, amount is set to 0.

A function named isEmpty that accepts no parameters and returns a boolean  value . isEmpty returns a boolean  value : true if the value of amount is less than 0.1, and false otherwise.

A function named getGasLevel that accepts no parameters . getGasLevel returns the value of the amount data member.

Solution

public class GasTank {
   private double amount;

   public GasTank() {
       // TODO Auto-generated constructor stub
       this.amount = 0;
   }

   public void addGas(double value) {
       this.amount += value;
   }

   public void useGas(double value) {
       this.amount -= value;
       if (this.amount <= 0)
           this.amount = 0;
   }

   public boolean isEmpty() {
       if (this.amount < 0.1)
           return true;
       else
           return false;
   }

   public double getGasLevel() {
       return this.amount;
   }
}