java方法不重写或实现来自超类型的方法：如何使重写工作？

Question

为了找到这个错误消息的答案，我真的搜索了很多，但不知为什么，到目前为止，我没有找到任何答案

public interface TileGenerator {

int NUMBER_OF_MOVABLE_TILES = 34;
int NUMBER_OF_LAST_MAGIC_ITEM = 25;
int NUMBER_OF_CONTIGUOUS_MAGIC_ITEMS = 20; 
ArrayList<Tile> createTiles();

ArrayList<MagicItem> createMagicItems();

}

还有我的子类：

public class RandomTileGenerator implements TileGenerator {

private static final int FIVE = 5;

private static final int THIRTEEN = 13;

private static final int SIXTEEN = 16;

private static final int TWENTYONE = 21;

private static final int TWENTYFIVE = 25;

private static final int TWENTY = 20;

private ArrayList<Tile> list2 = new ArrayList<Tile>(NUMBER_OF_MOVABLE_TILES);

@Override
public ArrayList<Tile> createTiles() {

    for (int x = 0; x < FIVE; x++) {
        list2.add(new Tri());
    }

    for (int x = 0; x < THIRTEEN; x++) {
        list2.add(new Straight());
    }

    for (int x = 0; x < SIXTEEN; x++) {
        list2.add(new Nook());
    }

    Collections.shuffle(list2);
    return list2;
}

@Override
public ArrayList<MagicItem> createMagicItems() {
    int i = 1;
    ArrayList<MagicItem> magicItemFound = new ArrayList<MagicItem>();
    for (int x = 0; x < TWENTYONE; x++) {

        magicItemFound.add(new MagicItem(i));
        i++;

    }

    magicItemFound.set(TWENTY, new MagicItem(TWENTYFIVE));

    Collections.shuffle(magicItemFound);

    return magicItemFound;

}

}

但我总是收到错误信息：

Labyrinth3Test.java:477: error: method does not override or implement a method from a supertype
            @Override 

我不知道如何以正确的方式覆盖它，因为我的覆盖注释似乎完全没有用处

我希望你能帮助我