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);
}

}