回文
char[] strs = {'2','4','d','4','2'}; boolean huiwen = isHuiwen(strs, 0, strs.length -1,strs.length); System.out.println(huiwen); } public static boolean isHuiwen(char a[],int low,int high,int length){ if(length == 1 || length == 0) return true; if (a[low] != a[high] || low >= high) { return false; } return isHuiwen(a, low + 1, high -1,length -2);