If that's the case, why does one need to use a graph library to construct simple graph data structure? It looks like JGraphIt is used as a strawman argument to exaggerate the difference.

BTW, Java does support some notion of literal construction using array.

  e.g. new Object[] {"abc", "xyz", 1, 2, 3, new Integer[] {4, 5, 6}, new Node(2)};