Method exch

src/test/resources/dataflow/constprop/alias/MaxPQ.java:74–78

(int i, int j)

    }

    private void exch(int i, int j) {
        int swap = pq[i];
        pq[i] = pq[j];
        pq[j] = swap;
    }

    public static void main(String[] args) {
        MaxPQ pq = new MaxPQ();