Is there a way to randomize increments/decrements between two integers in java?

I'm learning Java and need to make a vehicle simulator.

A vehicle can move one step each round either vertically or horizontally.

b) move method increments or decrements either x or y coordinates by 1.

I don't know if my unfinished code will be of any help, but here it is:

package vehicleSimulator;

public class Vehicle {
    int h; // horizontal coordinate instead of x
    int v; // vertical coordinate instead of y
    boolean isAlive = true; 

    public Vehicle(int h, int v, boolean isAlive) {
        this.h = h;
        this.v = v;
        this.isAlive = isAlive;
    }

    public void moveVehicle() {
        if (isAlive == true) {
            // ++ or -- x or y
        }

    }

Any help or links to sites that can help is much appreciated.