The default keyword

D.java

public class D implements Interface2 {
  
  public static void main (String… args) {
    Interface1 acct = new D();
    System.out.println(acct.getId());
  }
  
  public String getId() {
    return “1111”;
  }
}

interface Interface1 {
  public default String getId() {
    return “0000”;
  }
}

interface Interface2 extends Interface1 {
  public String getId();
}