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  1. class C1 {
  2.                 public void f ( ) {
  3.                           System.out.print(" 1 ");
  4.                  }
  5.  
  6.                 public void g ( ) {  
  7.                           f ( );
  8.                 }
  9.        }
  10.  
  11.                   class C2 extends C1 {
  12.                           public void f ( ) {
  13.                                     System.out.print(" 2 ");
  14.                           }
  15.                  }
  16.  
  17.                  public class Prog {
  18.                           public static void main(String args[ ]) {
  19.                                     C1 a = new C1( );
  20.                           a.f( );
  21.                                     C2 b = new C2( );
  22.                           b.f( );
  23.                           a = b;
  24.                           a.f( );
  25.                           b.g( );
  26.                           }
  27.        }
Compilation error #stdin compilation error #stdout 0s 0KB
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Standard input is empty
compilation info 
Main.java:17: error: class Prog is public, should be declared in a file named Prog.java
                 public class Prog {
                        ^
1 error
stdout
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Standard output is empty
https://ideone.com/IHt6l0
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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