test.java

public class Test {
    Integer[] bar() {
        return new Integer[0];
    }

    Integer[] foo(int n, int k) {
        Integer[][] a = new Integer[][] {new Integer[0], new Integer[0]};

        for (int i = 0; i < a.length; i++) {
            a[i] = bar();
        }

        return a;
    }
}