Help me out with this program in Java

1. Create Calculator class, realize the algorithm of addition, subtraction, multiplication and division, and demonstrate the operation in main. 2. Please define a class of Vehicle (car), including:Attributes speed, volume, etc Method: move 0, set speed (int speed), speedup (int speed), speeddown (int speed), etc Finally, instantiate a vehicle object in main) and initialize the value of speed and size to it through the method, and print it out. In addition, the method of acceleration and deceleration is called to change the speed