Calling a constructor from a constructor

I have got good explanation, just copying it here: Using this with a Constructor From within a constructor, you can also use the this keyword to call another constructor in the same class. Doing so is called an explicit constructor invocation. Here's another Rectangle class, with a different implementation from the one in the Objects section. public class Rectangle { private int x, y; private int width, height; public Rectangle() { this(0, 0, 1, 1); } public Rectangle(int width, int height) { this(0, 0, width, height); } public Rectangle(int x, int y, int width, int height) { this.x = x; this.y = y; this.width = width; this.height = height; } ... } This class contains a set of constructors. Each constructor initializes some or all of the rectangle's member variables. The constructors provide a default value for any member variable whose initial value is not provided by an argument. For example, the no-argument constructor creates a 1x1 Rectangle at coordinates 0,0. The two-argument constructor calls the four-argument constructor, passing in the width and height but always using the 0,0 coordinates. As before, the compiler determines which constructor to call, based on the number and the type of arguments. If present, the invocation of another constructor must be the first line in the constructor.

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If you need help, something isn't right in your code, the server won't accept your solution (even if you are 100% sure that it is correct). Describe your question/issue in the HELP section at codegym.cc/help.

I think their goal here isn't to give you all of the answers. At first glance, it doesn't make sense to teach in this method. However, in this field, you will be looking for answers. A lot. Emphasis on that last sentence. They are attempting to teach you to look outside this site, outside your direct instruction to find what you need. As far as the exercise goes, you can chain to only one constructor. The first one you create at the top will be the "this". Since you pass arguments to the constructor, theres no need to write out "this.variable = variable" because the arguments are applied directly to the other constructor, where those assignments are already defined.