初学java：判断字符串是否回文

import java.util.Scanner;

public class Test {

public static void main(String[] args) {
String s;
Scanner in=new Scanner(System.in);
System.out.print("请输入你要判断的字符串：");
s=in.nextLine();
if (comp(s))
System.out.println("是回文");
else
System.out.println("不是回文");
}

private static boolean comp(String s) {
int i=0;
char[] ch=s.toCharArray();
while (i{
if (ch[i]!=ch[s.length()-1-i])
return false;
i++;
}
return true;
}

}