Method union

CountTheNumberOfCompleteComponents.java:50–64

(int node1, int node2)

        }

        void union(int node1, int node2) {
            int rootParent1 = find(node1);
            int rootParent2 = find(node2);

            if (rootParent1 == rootParent2) {
                return;
            }
            if (size[rootParent1] > size[rootParent2]) {
                parent[rootParent2] = rootParent1;
                size[rootParent1] += size[rootParent2];
            } else {
                parent[rootParent1] = rootParent2;
                size[rootParent2] += size[rootParent1];
            }
        }
    }
}