How to call a method that returns some other method in Java

// Java program to visualize the Car

// A class Car
public class CarFunc {

    // A method engineStart() which
    // simply starts the engine
    public static void engineStart()
    {
        System.out.println("Engine Started!");
    }

    // A method carStart() which starts
    // the engine and other entities
    // required
    public static void carStart()
    {
        // Calling the function
        // engineStart() inside the
        // definition of function
        // carStart()
        engineStart();

        // Definitions of starting
        // various other entities
        // can be defined here

        // Finally, the car is
        // started
        System.out.println("Car Started!");
    }

    public static void main(String[] args)
    {

        carStart();

        // When the car is started,
        // we are ready to drive
        System.out.println("Let's Drive!");
    }
}

// A carSpeed class which manages
// the speed of the class
public class CarSpeedFunc {

    // Speed is a global variable. If
    // the speed is changed at any
    // part of the car, then the overall
    // speed of the car automatically
    // changes
    static int speed = 0;

    // Function to increase the speed
    public static void increaseSpeed()
    {
        speed = speed + 50;
        System.out.println(
            "Speed increased by 50 km/hr");

        // main() called inside this function
        main(new String[0]);
    }

    // Method which performs the increase
    // speed function when the accelerator
    // is pressed
    public static void pressAccelerator()
    {
        System.out.println(
            "Accelerator pressed "
            + "to increase speed");
        increaseSpeed();
    }

    // Driver code
    public static void main(String[] args)
    {
        System.out.println(
            "Driving with speed = "
            + speed
            + "km/hr");

        if (speed < 200) {
            pressAccelerator();
        }
        else {
            System.out.println(
                "Speed Limit Reached! "
                + "Drive Slow. Stay safe.");
        }
    }
}