[Java]外观数列

代码实现

public static void main(String[] args) {
        String[] a = new String[20];
        a[0] = "1";
        for (int i = 1; i < a.length; i++) {
            String s = String.valueOf(a[i - 1]);
            char[] chars = s.toCharArray();
            int index = 0;
            StringBuilder result = new StringBuilder();
            while (index < chars.length) {
                int times = 1;
                char p = chars[index];
                int t = index + 1;
                while (t < chars.length) {
                    if (p == chars[t++]) {
                        times++;
                    } else {
                        t--;
                        break;
                    }
                }
                index = t;
                result.append(times).append(p);
            }
            a[i] = result.toString();
        }
        System.out.println(Arrays.toString(a));
    }

输出