java语言递归实现1....n的输出

public class ChenDemo3 {    public static void main(String[] args) {        String str=getNum(5);        for (int i = str.length()-1; i >=0; i--) {            System.out.print(str.charAt(i));        }    }/** * 将int类型的数转换成字符串，返回字符串1...n * @param num * @return */    public static String getNum(int num) {        if (num==1) {            return ""+1;        }        return num+" "+getNum(num-1);    }}