Maze-Runner Karel

package Challenge2;
import kareltherobot.*;

/**
 * This program allows a robot to solve any maze
 */
public class Challenge2Main extends Robot{

    public Challenge2Main (int s, int a, Direction d, int b){ //constructor
        super(s, a, d, b);
    }

    public static void main(String[] args) {

        World.setVisible(); //reads and creates the world
        World.setDelay(20);
        World.readWorld("KarelChallenges2.kwld");

        Challenge2Main roach = new Challenge2Main(1,9, West,0);

        while(!roach.nextToABeeper()){ //the beeper indicates that the maze is solved

            if(roach.rightIsClear()){ //if the right is clear, turn right (right-hand method)
                roach.turnRight();
                roach.move();

            }else if(roach.frontIsClear()){ //if the front is clear, move forward
                roach.move();
            }else{
                roach.turnLeft(); //if neither the front nor the right is clear, turn left
            }
        }


    }

    /**
     * This method allows the robot to instantly turn right
     */
    public void turnRight(){
        int delay = World.delay();
        World.setDelay(0);
        turnLeft();
        turnLeft();
        World.setDelay(delay);
        turnLeft();
    }

    /**
     * This method allows the robot to instantly check if there is a wall to the left
     * @return if the left intersection is clear
     */
    public boolean leftIsClear(){
        int delay = World.delay();
        World.setDelay(0);
        boolean z = false;
        turnLeft();
        if(frontIsClear()){
            z = true;
        }
        World.setDelay(delay);
        turnRight();
        return z;
    }

    /**
     * This method allows the robot to instantly check if there is a wall to the right
     * @return if the right intersection is clear
     */
    public boolean rightIsClear(){
        int delay = World.delay();
        World.setDelay(0);
        boolean z = false;
        turnRight();
        if(frontIsClear()){
            z = true;
        }
        World.setDelay(delay);
        turnLeft();
        return z;
    }
}