Extraterrestrial Karel

package Challenge3;
import kareltherobot.*;

/**
 * This program makes a robot collect piles of beepers
 */
public class Challenge3Main extends Robot{

    public Challenge3Main(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(25);
        World.readWorld("KarelChallenges3.kwld");

        Challenge3Main paul = new Challenge3Main(1,1, North, 0);

        while(!paul.nextToABeeper()){ //runs until it finds the pile with two beepers

            if(paul.checkBeeperFront()){ //if there's a beeper in front, pick it
                paul.move();
                paul.pickBeeper();
            }else if(paul.checkBeeperLeft()){ //if there's a beeper to the left, pick it
                paul.turnLeft();
                paul.move();
                paul.pickBeeper();
            }else{ //if it is not in front or to the left, it should be to the right
                paul.turnRight();
                paul.move();
                paul.pickBeeper();
            }
        }
    }

    /**
     * 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();
    }

    /**
     * allows the robot to instantly turn around
     */
    public void turnAround(){
        int delay = World.delay();
        World.setDelay(0); //by changing the delay, the robot turns left instantaneously
        turnLeft();
        World.setDelay(delay);
        turnLeft();
    }

    /**
     * Immediately checks if there is a beeper in front of the robot
     * @return temp
     */
    public boolean checkBeeperFront(){
        int delay = World.delay();
        World.setDelay(0);
        boolean temp = false;

        if(frontIsClear()) { //checks if the front is clear to avoid errors
            move();

            if (nextToABeeper()) { //if there's a beeper there, return true
                temp = true;
            }

            turnAround(); //move back
            move();
            turnAround();
        }

        World.setDelay(delay);
        return temp;
    }

    /**
     * Immediately checks if there is a beeper to the left of the robot
     * @return temp
     */
    public boolean checkBeeperLeft(){
        int delay = World.delay();
        World.setDelay(0);
        boolean temp = false;

        turnLeft(); //Because we're checking the left

        if(frontIsClear()) { //checks if the front is clear to avoid errors
            move();

            if (nextToABeeper()) { //if there is a beeper there, return true
                temp = true;
            }

            turnAround(); //move back
            move();
            turnAround();
        }

        turnRight();
        World.setDelay(delay);
        return temp;
    }
}