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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. public class PianoKeys
  5. {
  6.    //-----------------------------------------------------------------
  7.    //  Prints the number of keys on a piano.
  8.    //-----------------------------------------------------------------
  9.    public static void main(String[] args)
  10.    {
  11.       int keys = 88;
  12.       System.out.println("A piano has " + keys + " keys.");
  13.    }
  14. }
  15.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:4: error: class PianoKeys is public, should be declared in a file named PianoKeys.java
public class PianoKeys
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/0WDMj4
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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