Object oriented java sample exam

Question

public class Bird
{
  private static int id = 0;
  private String kind;

  public Bird(String requiredKind)
  {
    id = id + 1;
    kind = requiredKind;
  }

  public S         


        

Answer 1

Because the id is static. That means that is a "Class variable/field" and there is only one per Class. All the instances of that Class share it the same id (indeed calling it "id" feels kinda weird).

See here