I dont understand the task!

Question

can someone explain me ?

HelloWorld.java

public class HelloWorld {
  private String programmingLanguage;

  public HelloWorld() {
    programmingLanguage = "Java";
  }

   @Override
  public void sayHelloTo() {
    String name = "";
    System.out.printf("Hola, %s%n!", name);
  }
}

HolaWorld.java

public class HolaWorld extends HelloWorld {
  @Override
  public void sayHelloTo() {
    String name = "";
    System.out.printf("Hola, %s%n!", name);
  }
}

Answer 1 · 2016-02-27T00:58:47Z

February 27, 2016 12:58am

The HolaWorld class extends the HelloWorld class and it has a method called sayHelloTo() that is supposed to override a method of the same name in the parent class. By using the @Override annotation the compiler will check to see if we are doing the overriding correctly. The method names and their signatures have to match but as it is the signatures do not, since the method in the parent class has a String parameter and the one in the child class has none. So to fix the problem we need to add that parameter to sayHelloTo() in HolaWord. We also need to make sure that we are not redefining the variable name inside the method:

public class HolaWorld extends HelloWorld {
  @Override
  public void sayHelloTo(String name) {
    name = "";
    System.out.printf("Hola, %s%n!", name);
  }
}

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Axel Rearte

Axel Rearte

I dont understand the task!

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Kourosh Raeen

Kourosh Raeen