关于split

String s = "a,b,c,d,,,,";
        String[] array = s.split(",");
        System.out.println(array.length);

 上述代码输出结果为4

String s = "a,,c,d";
        String[] array = s.split(",");
        System.out.println(array.length);

 上述代码输出结果也为4