PlayerActions.java

import java.util.Scanner;
import java.util.Random;

/**
 * This class contains the game actions
 * available to the user.
 * <p>
 * All of them are static and void,
 * since they only ever change the internal
 * status or print a message.
 */
public final class PlayerActions {

    /**
     * Asks for the position of a tank and
     * reduces its health by five points.
     */
    public static final void shootBullet() {
        Board.displayNumberedBoardState();
        System.out.print("General, what tank shall be shot? ");
        int positionToShootAt = new Scanner(System.in).nextInt();
        Tank tankToShootAt = Board.getTankFromPosition(positionToShootAt);

        try {
            tankToShootAt.decreaseHealthByFive();
            Board.bulletsFiredCounter++;
        } catch (NullPointerException e) {
            System.out.println("General, there is clearly not a tank there.");
        }
    }

    /**
     * Reduces the health of a random tank to 0,
     * skipping tanks whose health is 0.
     */
    public static final void activateAtomicBomb() {
        /*
         * Generates an integer between 0 and (maximum - 1).
         * Then adds 1 so the (max) range becomes [1, 4].
         */
        while (true) {
            // Wendy likes "Kill Bill" starring Uma Thurman
            int tokyo = new Random().nextInt(Board.MAX_AMOUNT_OF_TANKS) + 1;
            Tank bill = Board.getTankFromPosition(tokyo);
            if (bill.health != 0) {
                bill.decreaseHealthToZero();
                break;
            } else {
                continue;
            }
        }
    }

    /**
     * Duplicates the health of the tank with least health,
     * skipping tanks whose health is 0.
     */
    public static final void activateMutantTank() {
        Tank lowestHealthTank = Board.getTankFromPosition(1);
        for (int position = 1; position <= Board.MAX_AMOUNT_OF_TANKS; position++) {
            if (Board.getTankFromPosition(position).health < lowestHealthTank.health
                    // Skip "dead tanks" (health equals 0)
                    && Board.getTankFromPosition(position).health != 0) {
                lowestHealthTank = Board.getTankFromPosition(position);
            }
        }
        lowestHealthTank.health *= 2;
    }

    /**
     * Prints a random grandma quote from her Tank Wars days.
     */
    public static final void rememberGrannyWithAQuote() {
        String[] grannyQuotes = { "¡Cómo me encanta el dulce aroma de tanque chamuscado!",
                "Oh Panzer of the Lake, what is your wisdom?",
                "Si tuviera un dólar por cada tanque explotado, tendría como 2000 dólares. O lo que vienen a ser 5 mil pesos…",
                "Los aliens, en realidad, son seres que existen.",
                "¿Nunca les dije? Casi me premian… ¡pero me robaron mi gloria!" };

        System.out.println(grannyQuotes[new Random().nextInt(grannyQuotes.length)]);
    }

    /**
     * Prints a formatted message of the number of bullets/shots fired.
     */
    public static final void displayFormattedBulletsFired() {
        System.out.println("General, you have fired " + Board.bulletsFiredCounter + " bullets.");
    }
}