9.23java课堂测试

import java.util.Scanner;

public class Palindrome {
    public static void main(String[] args){
        String str="";
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入字符串：");
        str=sc.nextLine();
        boolean judge=huiwen(str,0,str.length());
        if(judge==true){
            System.out.println("是回文字符串！");
        }
        else{
            System.out.println("不是回文字符串！");
        }
    }
    public static boolean huiwen(String str,int start,int length){
        if(length<=1)
            return true;
        else if(str.toCharArray()[start]==str.toCharArray()[length-1]){
            return huiwen(str,start+1,length-1);
        }
        return false;
    }
}