ArrayList<int[]> containing a value
java
Solution
Arrays don't override the `Object.equals()` method (that `ArrayList.contains()` uses to compare objects). So an array is only equal to itself. You'll have to loop through the list and compare each element with your array using `Arrays.equals()`.
What I suspect, though, is that you shouldn't have a `List<int[]>`, but a `List<Coordinate>`. The Coordinate class could then override `equals()` and `hashCode()`, and you would be able to use
example.contains(new Coordinate(2, 4))
You could also use a `List<List<Integer>>`, but if what I suspect is true (i.e. you're using arrays to hold two coordinates that should be in class), then go with the custom Coordinate class.
Problem
if i have an `ArrayList<int[]>` example and I want to check if {2,4} is in it how would I do this? ``` exaple.contains({2,4}); //doesn't work ``` and ``` exaple.contains(2,4); //doesn't work either ``` what is wrong with the code?