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Question about the task

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line 22 ? i don't get the condition

Until now, we've set the apple's coordinates manually. We need to create a method for generating new apples. Let's call it createNewApple().

The method should generate random cell coordinates within the playing field, which determine where the apple will appear. Assign a reference to the newly created apple to the apple field. Also, at the end of each turn you need to check whether the current apple is still alive. If it is not, then create a new one.

To generate random numbers, call the parent class's getRandomNumber(int) method.

Requirements:

The SnakeGame class must have a private void createNewApple() method.
The getRandomNumber(int) method must be called twice in the createNewApple() method. The first time — with WIDTH as the argument; the second time — with HEIGHT as the argument.
The createNewApple() method must create a new Apple object. Pass the results of the two calls to the getRandomNumber(int) method as arguments.
The apple field must be assigned a reference to the created Apple object.
A new Apple object must not be created in the createGame() method.
In the createGame() method, the createNewApple() method must be called before the drawScene() method.
In the onTurn() method, if apple.isAlive == false, you must call the createNewApple() method before calling the drawScene() method.

package com.codegym.games.snake; import com.codegym.engine.cell.*; import java.util.Random.*; public class SnakeGame extends Game{ //променливи за полето public static final int WIDTH = 15; public static final int HEIGHT = 15; //променлива змия private Snake snake; //променлива за скоростта на хода private int turnDelay; //променлива за ябълка private Apple apple; //метод за създаване на ябълка private void createNewApple(){ getRandomNumber(WIDTH); getRandomNumber(HEIGHT); apple = new Apple(WIDTH,HEIGHT); } //метод за рисуването на полето private void drawScene(){ for(int x = 0; x < WIDTH ; x++){ for(int y = 0; y < HEIGHT; y++){ setCellValueEx(x,y,Color.DARKSEAGREEN,"");//setCellColor(x,y,Color.DARKSEAGREEN); } } snake.draw(this); apple.draw(this); } //метод за създаване на змията и полето private void createGame() { snake = new Snake(WIDTH / 2, HEIGHT / 2); turnDelay=300; setTurnTimer(turnDelay);//змията почва с начална скорост 300 createNewApple(); //apple = new Apple(5,5); drawScene(); } //метод за движение на змията в посока @Override public void onKeyPress(Key key){ //избиране на посока if(key == Key.LEFT){ snake.setDirection(Direction.LEFT); } else if(key == Key.RIGHT){ snake.setDirection(Direction.RIGHT); } else if(key == Key.UP){ snake.setDirection(Direction.UP); } else if(key == Key.DOWN ){ snake.setDirection(Direction.DOWN); }else{ } } //метод @Override public void onTurn(int s){ // snake.move(); snake.move(apple); if(apple.isAlive == false){ createNewApple(); } drawScene(); } //set the field public void initialize(){ setScreenSize(WIDTH,HEIGHT); createGame(); } }

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Aleksandra

Level 22 , Warszawa, Polska

5 April 2020, 22:48

Hi, getRandomNumbers(int) method returns a int, so in lines 20 and 21 you just call method but its result isn't save anywhere. And then you just get a new Apple with HEIGHT and WIDTH so 15 and 15 in that case. You can do something like that: int randomNumber1 = getRandomNumber(WIDTH); and of course other variable for HEIGHT but I would recommend just doing this: new Apple(getRandomNumber(WIDTH), getRandomNumber(HEIGHT)) ; without variables, they are not necessary here. Remember that you have to save what method returns, otherwise you just do it and nothing happens. :) I hope I helped you a bit, good luck with the rest of the game. :)

Zuz

Level 20 , Plovdiv, България

2 May 2020, 16:12

Thanks for the help ! I passed !