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  1. import java.util.*;
  2. import java.lang.*;
  3.  
  4. class Main
  5. {
  6.     class X {
  7.  
  8.     }
  9.     X x;
  10.     public Main(X x) {
  11.         this.x = x;
  12.     }
  13.     public Main(String s) {
  14.         this(this.new X());
  15.     }
  16. 	public static void main (String[] args) throws java.lang.Exception
  17. 	{
  18. 		Main main = new Main("");
  19. 	}
  20. }
Compilation error #stdin compilation error #stdout 0s 0KB
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Standard input is empty
compilation info 
Main.java:14: error: cannot reference this before supertype constructor has been called
        this(this.new X());
             ^
1 error
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Standard output is empty
https://ideone.com/HFIxVL
language:
Java (12.0.1)
created:
12 years ago
visibility:
public

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