what type of java constructors are these? Constructor chaining?

Question

These are from the spring amqp samples on github at https://github.com/SpringSource/spring-amqp-samples.git what type of java constructors are these? are they a short hand for getters and setters?

public class Quote {

    public Quote() {
        this(null, null);
    }

    public Quote(Stock stock, String price) {
        this(stock, price, new Date().getTime());
    }

as oppossed to this one

public class Bicycle {

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