More on Constructors

Remember, a constructor is a method that initializes an object when it is created and the name of the method is the same as the class that it belongs to.
You can call a constructor from inside of another one by using this as a method name: this(arg1, arg2, ...);
When you create a constructor in a subclass, you will usually want to call the constructor in the superclass so that any inherited instance variables are initialized properly.
Use the keyword super: super(arg1, arg2, ...);
This must be the first statement in your method.
If you don't explicitly use super to call one of the superclass's constructors, it will automatically call super() for you.
While you are learning, it is not a bad idea to include the explicit call, even if it is the default, so that is is clear what constructor is being called in your subclass.
After you have learned it, take the explicit calls to super() out.