What is the output of the following code?

interface A
{
    int var = 2;
}
class B implements A 
{
    void show()
    {
      var = 3;
      System.out.println("var = "+var);
    }
}
public class Main {
  public static void main(String[] args) {
    B obj = new B();
    obj.show();  
  }
}