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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. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public class Constants {
  11. 		public static final String STRING_CONSTANT = "string_constant";
  12. 		public static final Integer INTEGER_CONSTANT = 1;
  13. 		//public static final Integer INTEGER_CONSTANT = new Integer("1");
  14. 		//public static final Integer INTEGER_CONSTANT = Integer.valueOf(1);
  15. 	}
  16. 	public static void main (String[] args) throws java.lang.Exception
  17. 	{
  18. 		System.out.println("STRING_CONSTANT = " + Constants.STRING_CONSTANT);
  19. 		System.out.println("INTEGER_CONSTANT = " + Constants.INTEGER_CONSTANT);
  20. 	}
  21. }
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:12: error: Illegal static declaration in inner class Ideone.Constants
		public static final Integer INTEGER_CONSTANT = 1;
		                            ^
  modifier 'static' is only allowed in constant variable declarations
1 error
stdout
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Standard output is empty
https://ideone.com/nWV4Xf
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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