使用IntStream检查2D数组中的数组

Question

I'm looking to check if a set of coordinates ( coor ) exists within an array of coordinates ( coorArray ). I've seen in other posts how to concatenate the 2D array so that it can be searched for in an IntStream for a lone int but I'm not sure how to translate that towards my problem. Thank you for the help!

example arrays:

int[][] coorArray = {{1,2},{2,2},{3,0}};
int[] coor = {1,2};

Answer 1

Yoy can use stream().anyMatch() to perform this check:

int[][] coorArray = {{1,2},{2,2},{3,0}};
int[] coor = {1,2};
boolean exist = Arrays.stream(coorArray).anyMatch(e -> Arrays.equals(e, coor));
System.out.println("exist = " + exist);  

Outputs:

exist = true

---

Otherwise, when coordinates is not exists in input array:

int[][] coorArray = {{4,2},{2,2},{3,0}};
int[] coor = {1,2};
boolean exist = Arrays.stream(coorArray).anyMatch(e -> Arrays.equals(e, coor));
System.out.println("exist = " + exist);

Outputs:

exist = false

Answer 2

Here is another example without lambda expressions if you like ;). Consisting of a simple for each and the check per coordinate.

public static boolean exists(int[][] coords, int[] coord){
    for(int[] c : coords){
        if(c[0] == coord[0] && c[1] == coord[1]) {
            return true;
        }
    }
    return false;
}

I'm not sure if there is something else available in the API but that should serve the requirement.