package huiwen; import java.util.Scanner; public class Huiwen { public static void main(String[] args) { // TODO Auto-generated method stub String s; int j; int i = 0; Scanner input = new Scanner(System.in); System.out.println("请输入 一个字符串:"); s = input.next(); char a[]; a = s.toCharArray(); j = a.length - 1; for (int k = 0; k < s.length(); k++) { System.out.print(a[k]); } huiwen(a, j, i); } public static void huiwen(char a[], int j, int i) { if (i >= j) { if (a[i] == a[j]) System.out.println("是回文"); System.exit(0); } if (a[i] == a[j]) huiwen(a, --j, ++i); else { System.out.println("不是回文!"); System.exit(0); } } }