public abstract class Bike
{
    Bike()
    {
        System.out
                .println("abstract class Bike constructor is called.");
    }

    /*
     * If there is any abstract method in a class, that
     * class must be abstract.
     */
    abstract void run();

    void changeGear()
    {
        System.out.println("gear changed");
    }
}

/*
 * If you are extending any abstract class that have
 * abstract method, you must either provide the
 * implementation of the method or make this class abstract.
 */
class Honda extends Bike
{

    public Honda()
    {
        super();
    }

    void run()
    {
        System.out.println("running safely..");
    }
}