public class ChenDemo3 {
public static void main(String[] args) {
String str=getNum(5);
System.out.println(str);
}
/**
* 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 getNum(num-1)+" "+num;
}
}