NonComparableSuperClass node1 = new NonComparableSuperClass(1);
    NonComparableSuperClass node3 = new NonComparableSuperClass(3);
    NonComparableSuperClass node5 = new NonComparableSuperClass(5);
    NonComparableSuperClass node7 = new NonComparableSuperClass(7);

    graph.addNode(node1);
    graph.addNode(node7);
    graph.addNode(node5);
    graph.addNode(node3);