Second and third requirement

Question about the task

Under discussion

Hi! When i run the game everything runs perfectly but I can't verify second and third requirement. Where did I go wrong ?

Currently, spikes appear only once (at the beginning of the game). To generate a new spike, the old spike must be removed from the items list after its leaves the screen. To remove the spike, you can either use an iterator, or create a copy of the items list and run through it in a loop. If an object needs to be removed, call items.remove(item).

Requirements:

The RoadManager class must have a private void deletePassedItems() method.
The deletePassedItems() method must remove from the items list any elements whose y coordinate is greater than or equal to RacerGame.HEIGHT.
The deletePassedItems() method must not change the reference stored in the items field.
The RoadManager class's move(int) method must call the deletePassedItems() method.
In the RoadManager class's move(int) method, the deletePassedItems() method must be called after moving all the object in the items list.

package com.codegym.games.racer; public class ShapeMatrix { public static final int[][] PLAYER = new int[][]{ {0, 0, 123, 123, 0, 0}, {1, 0, 123, 123, 0, 1}, {1, 1, 123, 123, 1, 1}, {1, 0, 123, 123, 0, 1}, {0, 0, 123, 123, 0, 0}, {1, 0, 123, 123, 0, 1}, {1, 1, 123, 123, 1, 1}, {1, 0, 123, 123, 0, 1} }; public static final int[][] SPORT_CAR = new int[][]{ {5, 0, 5, 5, 0, 5}, {5, 1, 5, 5, 1, 5}, {5, 0, 5, 5, 0, 5}, {0, 0, 5, 5, 0, 0}, {5, 0, 5, 5, 0, 5}, {5, 1, 5, 5, 1, 5}, {5, 0, 5, 5, 0, 5}, {0, 0, 5, 5, 0, 0}, }; public static final int[][] DRUNK_CAR = new int[][]{ {3, 0, 3, 3, 0, 3}, {3, 1, 3, 3, 1, 3}, {3, 0, 3, 3, 0, 3}, {0, 0, 3, 3, 0, 0}, {3, 0, 3, 3, 0, 3}, {3, 1, 3, 3, 1, 3}, {3, 0, 3, 3, 0, 3}, {0, 0, 3, 3, 0, 0}, }; public static final int[][] PASSENGER_CAR = new int[][]{ {0, 4, 4, 4, 4, 0}, {4, 4, 1, 1, 4, 4}, {4, 1, 4, 4, 1, 4}, {4, 4, 4, 4, 4, 4}, {4, 1, 4, 4, 1, 4}, {4, 4, 4, 4, 4, 4}, {4, 1, 4, 4, 1, 4}, {4, 4, 1, 1, 4, 4}, {0, 4, 4, 4, 4, 0} }; public static final int[][] TRUCK = new int[][]{ {0, 7, 7, 7, 7, 0}, {7, 7, 7, 7, 7, 7}, {7, 1, 7, 7, 1, 7}, {7, 1, 7, 7, 1, 7}, {7, 7, 7, 7, 7, 7}, {7, 1, 7, 7, 1, 7}, {7, 1, 7, 7, 1, 7}, {7, 7, 7, 7, 7, 7}, {0, 7, 7, 7, 7, 0}, {0, 1, 1, 1, 1, 0}, {0, 7, 7, 7, 7, 0}, {7, 7, 7, 7, 7, 7}, {7, 1, 2, 1, 1, 7}, {7, 1, 2, 1, 1, 7}, {0, 7, 7, 7, 7, 0}, }; public static final int[][] BUS = new int[][]{ {0, 8, 8, 8, 8, 0}, {8, 8, 8, 8, 8, 8}, {8, 1, 8, 8, 1, 8}, {8, 1, 8, 8, 1, 8}, {8, 8, 8, 8, 8, 8}, {8, 1, 8, 8, 1, 8}, {8, 1, 8, 8, 1, 8}, {8, 8, 8, 8, 8, 8}, {8, 1, 8, 8, 1, 8}, {8, 1, 8, 8, 1, 8}, {8, 8, 8, 8, 8, 8}, {8, 1, 2, 1, 1, 8}, {8, 1, 2, 1, 1, 8}, {8, 1, 2, 1, 1, 8}, {0, 8, 8, 8, 8, 0}, }; public static final int[][] ROAD_MARKING = new int[][]{ {2}, {2}, {2}, {2}, }; public static final int[][] SPIKE = new int[][]{ {2, 0, 0, 0, 2, 0}, {7, 1, 2, 0, 7, 1}, {0, 0, 7, 1, 0, 0}, {2, 0, 0, 0, 2, 0}, {7, 1, 2, 0, 7, 1}, {0, 0, 7, 1, 0, 0} }; }

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Guadalupe Gagnon

Level 37 , Tampa, United States

18 July 2022, 13:21

It is illegal to continue iterating over a collection that has had an element removed without using the Iterator's remove method, which is safe. When an item is removed from the collection using an unsafe method and the iterator loop is allowed to continue, a ConcurrentModificationException is thrown. Make sure that you only remove items using the iterator and not directly from the collection. *hint* line 29