Thermostat - Showcase Time Passing And Temperature Reaching Desired Setting

Here is the question:

-In your main, you should create a thermostat and thoroughly test it. Be sure to showcase time passing and the temperature reaching the desired setting. Also, showcase switching modes from heating to cooling.

My question is, once it reaches the desired temp, would the thermostat turn off, and then how do you show switching from heating and cooling.

This is what prints.

Thermostat is: true Thermostat is: false The desired temp: 70.0 The current temp: 69.0
Tue Feb 25 19:06:21 CST 2014
Tue Feb 25 20:06:21 CST 2014
Thermostat is: true Thermostat is: false The desired temp: 70.0 The current temp: 70.0

Here is my Class:

import java.util.Random;
import java.util.Date;
public class Thermostat {
private double currentTemp;
private double desiredTemp;
private double heatingThreshold;
private double coolingThreshold;

[Code] .....