JavaTpoint
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Question 1: What is the output of the following program ?
import java.util.HashSet;

class Animal {
public int i=12;

public Animal(){
i=13;
}
public String toString(){
return "Animal"+i;
}
}
public class Test {
public static void main(String [] args) throws Exception {
HashSet s= new HashSet();
s.add(new Animal());
s.add(new Animal());
for(Animal a : s){
System.out.println(a);
}
}
}

1. Animal 0
2. Animal 13
3. Animal 13 Animal 13
4. Runtime error about duplicate elements