ObserverTest
............\.classpath
............\.project
............\.settings
............\.........\org.eclipse.jdt.core.prefs
............\bin
............\...\Alarm.class
............\...\Display.class
............\...\Heater.class
............\...\ObserverTest.class
............\src
............\...\Alarm.java
............\...\Display.java
............\...\Heater.java
............\...\ObserverTest.java