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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. import java.util.*;
  8.  
  9. public class Ref {
  10.  
  11. 	public static void main(String[] args) {
  12. 		StringBuilder s1 = new StringBuilder("Hello Java!");
  13. 		String s2 = s1.toString();
  14. 		List<String> lst = new ArrayList<String>();
  15. 		lst.add(s2);
  16. 		System.out.println(s1.getClass());
  17. 		System.out.println(s2.getClass());
  18. 		System.out.println(lst.getClass());
  19. 	}
  20. }
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:9: error: class Ref is public, should be declared in a file named Ref.java
public class Ref {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/S6yrxJ
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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