java:判断字符串是不是回文字符串

import java.util.*;
public class forth2 {
	public static void main(String[] args) {
		Scanner input =new Scanner(System.in);
		System.out.print("enter a string: ");
		String s=input.nextLine();
		int low =0;
		int high=s.length()-1;
		boolean isp=true;
		while(low