多选题 Given:
51. String s = "4.5x4.a.3";
52. String[] tokens = s.split("//s");
53. for(String o: tokens)
54. System.out.print (o + " ");
55.
56. System.out.print(" ");
57. tokens = s.split("//..");
58. for(String o: tokens)
59. System.out.print(o + " ");
What is the result?