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I am trying to check if a List contains all values that are saved in an Array.
Here is my code:
List<PlayingCard> playerDeck = new ArrayList<>();
playerDeck.add(PlayingCard.METAL);
playerDeck.add(PlayingCard.METAL);
public boolean canBuild(Item item) {
return playerDeck.containsAll(Arrays.asList(item.requiredCards()));
}
public enum Item {
...
public PlayingCard[] requiredCards() {
return new PlayingCard[] {
PlayingCard.METAL,
PlayingCard.METAL,
PlayingCard.METAL
};
}
}
My current canBuild() method won’t work like this.
playerDeck = [Metal] requiredCards = [Metal, Metal] playerDeck.containsAll(requiredCards) == true
Can anybody help me out?
Answer
You didn’t declare one of your enums correctly. And it is unclear whether you were trying to executed method in a static context. Try the following:
enum PlayingCard {
METAL
}
enum Item {
FOO;
public PlayingCard[] requiredCards() {
return new PlayingCard[] { PlayingCard.METAL,
PlayingCard.METAL, PlayingCard.METAL };
}
}
static List<PlayingCard> playerDeck = new ArrayList<>();
public static void main(String[] args) {
playerDeck.add(PlayingCard.METAL);
playerDeck.add(PlayingCard.METAL);
Item foo = Item.FOO;
System.out.println(canBuild(foo));
}
public static boolean canBuild(Item item) {
return playerDeck
.containsAll(Arrays.asList(item.requiredCards()));
}
UPDATE:
List<Integer> a = List.of(1,1,1); List<Integer> b = List.of(1,1); List<Integer> c = List.of(1,1,1); List<Integer> d = List.of(1,2,1); List<Integer> e = List.of(1,1,2); System.out.println(a.equals(b)); //false different count System.out.println(a.equals(c)); //true same numbers and count System.out.println(a.equals(d));// false same count, different numbers System.out.println(a.equals(e)); // false same numbers and count, different order
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