fork(1) download 
  1.  
  2. import java.util.*;
  3. import java.lang.*;
  4. import java.io.*;
  5.  
  6. class Country {
  7. 	static final Set<String> EXISTING = new HashSet<String>();
  8.  
  9. 	final String name;
  10.  
  11. 	Country(String name) {
  12. 		if(EXISTING.contains(name))
  13. 			throw new IllegalArgumentException(name + " already exists!");
  14.  
  15. 		this.name = name;
  16. 		EXISTING.add(name);
  17. 	}
  18.  
  19. 	public static void main (String[] args) {
  20. 		Country oldSweden = new Country("Sweden");
  21.  
  22. 		try {
  23. 			Country newSweden = new Country("Sweden");
  24. 		} catch(IllegalArgumentException iae) {
  25. 			System.out.println(iae.getMessage());
  26. 		}
  27. 	}
  28. }
Success #stdin #stdout 0.07s 380160KB
comments (?)
stdin 
Standard input is empty
stdout 
Sweden already exists!
https://ideone.com/uhDCzM
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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