反向字符串递归方法 [英] reverse string recursive method

问题描述

你好为什么我使用递归的反向方法不起作用?打印语句显示操作正确完成，但最后似乎只有整个字符串的 ast 字符被分配给 h.

Hello Why my reverse method that uses recursion isn't working? The print statement shows that the operation is done correctly but at the end it seems like only the very ast char of the entire String is assigned to h.

    public static String reverse(String s,String h){

    if(s.length()==0){

        return s;

    } else {


        h+=s.charAt(s.length()-1);
        System.out.println(h);//FOR TEST
        s=s.substring(0,s.length()-1);
        reverse(s,h);
        return h;
    }

}

有什么建议吗?

推荐答案

使用

 return reverse(s,h); 

代替返回 h;

即:

public static String reverse(String s,String h){

    if(s.length() == 0){

        return h;

    } else {


        h+=s.charAt(s.length()-1);
        System.out.println(h);//FOR TEST
        s=s.substring(0,s.length()-1);
        return reverse(s,h); //NOTICE THE CHANGE HERE,
    }

}

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