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  1.  
  2. import java.io.*;
  3.  
  4. import java.lang.reflect.Field;
  5. class Ideone
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9. 	    Field fd = FileDescriptor.class.getDeclaredField("fd");
  10. 	    fd.setAccessible(true);
  11. 	    System.out.println("stdin: "+fd.get(FileDescriptor.in));
  12. 	    System.out.println("stdout: "+fd.get(FileDescriptor.out));
  13. 	    System.out.println("stderr: "+fd.get(FileDescriptor.err));
  14. 	}
  15. }
Success #stdin #stdout 0.05s 2184192KB
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stdin
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Standard input is empty
stdout
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stdin: 0
stdout: 1
stderr: 2
https://ideone.com/xW5jrO
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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