Subclass not allowing world to run

Question

I am a beginner, taking a CompSci class in school. This chapter is making subclasses; however, The class is somehow causing the program to terminate. The world doesn't even appear, and there are no errors. (I am running Eclipse).

Here is my code:

package karel;
import kareltherobot.*;
public class Race implements Directions
{
public static void main(String args[]) {



class Car extends UrRobot
{   public Car(int street, int avenue, Direction direction, int beepers) 
    {super(5, 5, East, infinity);
    }

    public void turnAround()
    {
        turnLeft();
        turnLeft();
    }

    public void turnRight()
    {   
        turnLeft();
        turnLeft();
        turnLeft();
    }
}
    {   
        World.setVisible(true);
        World.showSpeedControl(true);
    }
        {
            Car kar = (Car) new UrRobot(5, 5, East, infinity);
            kar.move();
            kar.turnLeft();
            kar.move();
            kar.turnAround();
            kar.move();
            kar.turnRight();

        }

}

}

Is there a way to get this program to not error to termination?

Answer 1

Try the following.

import kareltherobot.*;

public class Race implements Directions
{
    public Race(){
     }

public static void main(String args[]) {

class Car extends UrRobot
{   

public Car(int street, int avenue, Direction direction, int beepers)

{

    super(street, avenue, direction, beepers);
}

public void turnAround()

{
    super.turnLeft();
    super.turnLeft();
}
public void turnRight()
{           
    super.turnLeft();
    super.turnLeft();
    super.turnLeft();
}
}

World.setVisible(true);
World.showSpeedControl(true);    
Car kar = new Car(5, 5, East, 100);
kar.move();
kar.turnLeft();
kar.move();
kar.turnAround();
kar.move();
kar.turnRight();

}
}

Answer 2

You need to have code ran in the main function. Java finds and executes code in the classes main function. Try that, if it doesn't work, come back and repost.