Passing Information To A Method Or Constructor

Passing Information to a Method or a Constructor

They show a line of code that goes like this:

public Polygon polygonFrom(Point[] corners) {
// method body goes here
}

So from what I understand this is a constructor method for a Polygon object from the Polygon class. What I dont get is the name of the method polygonFrom()

Shouldn't a constructor for a Polygon just have the same name as the class? Because from earlier examples in the tutorial it seems to me that this is what has been done

For example:

public Bicycle(int startCadence, int startSpeed, int startGear) {
gear = startGear;
cadence = startCadence;
speed = startSpeed;
}