public class Test {

  public static void main(String[] args) {

    Apple a = new Apple();

    System.out.println(a);

    System.out.println("---------------");

    GoldenDelicious g = new GoldenDelicious(7);

    System.out.println(g);

    System.out.println("---------------");

​

    Apple c = new GoldenDelicious(8);

    System.out.println(c);

  }

}

​

class Apple {

  double weight;

  public Apple() {

    this(1);

    System.out.println("Apple no-arg constructor");

  }

  public Apple(double weight) {

    this.weight = weight;

    System.out.println("Apple constructor with weight");

  }

  @Override 

  public String toString() {

    return "Apple: " + weight;

  }

}

​

class GoldenDelicious extends Apple {

  public GoldenDelicious() {

    this(5);

    System.out.println("GoldenDelicious non-arg constructor");

  }

  public GoldenDelicious(double weight) {

    super(weight);

    this.weight = weight;

    System.out.println("GoldenDelicious constructor with weight");

  }

  @Override 

  public String toString() {

    return "GoldenDelicious: " + weight;

  }

}