Question about the cat class

// this line declares the class. The name is Cat, its access is public so that it can be uses from outside
// the project, and it is static so it resides in another class but is not part of that class
public static class Cat {
    // class field of String. Variable is named 'name'. Its private so it can only be accessed within the
    // code that is part of the Cat class
    private String name;

    /* this is the Constructor. Constructors are simply implemented with an access modifier, the class name
    then the parameters. In this one it is public (can be accessed outside the project), and the parameter
    is a String*/
    public Cat(String name) {
        /*the String that is passed into this constructor, called the argument, will be used to set the class
        field (line 6) with this line of code. Because the field is called 'name', and the parameter is also
        called 'name', you must use 'this' when referring to the class field*/
        this.name = name;
    }

    /*this is a method, called toString(). They are declared similarly to constructors but must also include,
    a return value. In this one it returns a String. If you don't want the method to actually return something
    you still have to specify 'void', which means nothing, as its return value.*/
    public String toString() {
        /*because this method has a String, it MUST reach a return line that returns a String
        the below line does this by returning "Cat {catName}"*/
        return "Cat " + this.name;
    }
}