fork download
copy 
  1. import java.nio.CharBuffer;
  2.  
  3. class Main {
  4.  
  5.     private static void starLine(int k) {
  6.         System.out.println(CharBuffer.allocate(k).toString().replaceAll("\0", "*"));
  7.     }
  8.  
  9.     public static void stars(int k, int n) {
  10.         if (k > n) {
  11.             throw new RuntimeException("Cannot do this");
  12.         } else if (k == n) {
  13.             starLine(k);
  14.         } else {
  15.             starLine(k);
  16.             stars(k + 1, n);
  17.             starLine(k);
  18.         }
  19.     }
  20.  
  21.     public static void main(String[] args) {
  22.         stars(3, 7);
  23.     }
  24. }
  25.  
Success #stdin #stdout 0.03s 245632KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
***
****
*****
******
*******
******
*****
****
***
https://ideone.com/StJRS
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!