Write a class named GasTank containing: • An instance variable named amount of type double, initialized to 0. • A method 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 method named useGas that accepts a parameter of type double. The value of the amount instance variable is decreased by the value of the parameter. However, if the value of amount is decreased below 0, amount is set to 0. • A method named isEmpty that accepts no parameters. isEmpty returns a boolean value: true if the value of amount is less than 0.1, and false otherwise. • A method named getGasLevel that accepts no parameters. getGasLevel returns the value of the amount instance variable.
Write a class named GasTank containing: • An instance variable named amount of type double, initialized to 0. • A method 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 method named useGas that accepts a parameter of type double. The value of the amount instance variable is decreased by the value of the parameter. However, if the value of amount is decreased below 0, amount is set to 0. • A method named isEmpty that accepts no parameters. isEmpty returns a boolean value: true if the value of amount is less than 0.1, and false otherwise. • A method named getGasLevel that accepts no parameters. getGasLevel returns the value of the amount instance variable.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:**GasTank Class Definition**
The GasTank class includes:
- **Instance Variable:**
- `amount`: A variable of type `double`, initialized to 0.
- **Methods:**
- `addGas(double parameter)`: Increases the value of the `amount` variable by the value of the parameter.
- `useGas(double parameter)`: Decreases the value of the `amount` variable by the value of the parameter. If the value of `amount` becomes less than 0 after the operation, it is set to 0.
- `isEmpty()`: Takes no parameters and returns a boolean value. It returns `true` if the value of `amount` is less than 0.1, and `false` otherwise.
- `getGasLevel()`: Takes no parameters and returns the current value of the `amount` variable.
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