String spilt的使用和常见的坑以及平替方案性能比较

        String b = "This is the code, test 1 ,test 2";
        String b0 = b.split(",")[0];
        String b1 = b.split(",")[1];
        String b2 = b.split(",")[2];

        System.out.println(b0);
        System.out.println(b1);
        System.out.println(b2);

				//outPut:
				This is the code
 				test 1 
				test 2

        String a = "always This is the code, test 1 ,test 2";

        String s0 = a.split(",",2)[0];
        String s1 = a.split(",",2)[1];
        System.out.println(s0);
        System.out.println(s1);

				//outPut:
				always This is the code
				test 1 ,test 2
        
        //此时如果输出a.split(",",2)[2],也就是数组的第三个元素会报异常
          ArrayIndexOutOfBoundsException(数组越界)

    private static final Pattern ROMAN = Pattern.compile("^(?=.)M*(C[MD]|D?C{0,3})" + "(X[CL]|L?X{0,3})(I[XV]|V?I{0,3})$");

    static boolean isRomanNumber(String s) {
        return ROMAN.matcher(s).matches();
    }

        StringTokenizer stringTokenizer = new StringTokenizer("also This is the code, test 1 ,test 2", ",");
        while (stringTokenizer.hasMoreTokens()){
            String s = stringTokenizer.nextToken();
            System.out.println(s);
        }

List<String> split = StrSpliter.split(a, ',');