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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 static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13. 		Map<String, String> test = new HashMap<>();
  14.  
  15. 		test.put("1", "a");
  16. 		test.put(null, "2");
  17.  
  18. 		System.out.println(test);
  19. 	}
  20. }
Success #stdin #stdout 0.12s 40384KB
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stdin
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Standard input is empty
stdout
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{null=2, 1=a}
https://ideone.com/0GYtGa
language:
Java (HotSpot 12)
created:
1 year ago
visibility:
public

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