2-35 判断回文字符串

用两个指针就好了~

import java.util.Scanner;

public class test6 {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String str = s.nextLine();
        String q = "";
        boolean flag = true;
        for(int i = 0, j = str.length() -1; i <= j;){//双指针
            if(str.charAt(i) == str.charAt(j)){
                i ++;
                j --;
            }
            else{
                flag = false;
                break;
            }
        }
        if(flag) System.out.println("yes");
        else System.out.println("no");
    }
}