Write, in JAVA code, 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 valueof the parameter.

A method named useGas that accepts a parameter of type double. The value of the amount instance variable is decreased by the valueof the parameter.

A method named getGasLevel that accepts no parameters. getGasLevel returns the value of the amount instance variable.