Observer java code : difference between push and pull style of observer

Lab11
.....\build
.....\.....\classes
.....\.....\.......\Exercise
.....\.....\.......\........\CalculateHandicap$1.class
.....\.....\.......\........\CalculateHandicap$2.class
.....\.....\.......\........\CalculateHandicap$3.class
.....\.....\.......\........\CalculateHandicap$4.class
.....\.....\.......\........\CalculateHandicap.class
.....\.....\.......\........\CalculateHandicap.form
.....\.....\.......\lab
.....\.....\.......\...\nonpattern
.....\.....\.......\...\..........\CourseRecord.class
.....\.....\.......\...\..........\CourseViewer.class
.....\.....\.......\...\..........\LayoutConstants.class
.....\.....\.......\...\pattern
.....\.....\.......\...\.......\BarChartObserver.class
.....\.....\.......\...\.......\CourseController.class
.....\.....\.......\...\.......\CourseData.class
.....\.....\.......\...\.......\CourseRecord.class
.....\.....\.......\...\.......\LayoutConstants.class
.....\.....\.......\...\.......\Observable.class
.....\.....\.......\...\.......\Observer.class
.....\.....\.......\...\.......\PieChart.class
.....\build.xml
.....\manifest.mf
.....\nbproject
.....\.........\build-impl.xml
.....\.........\genfiles.properties
.....\.........\private
.....\.........\.......\private.properties
.....\.........\.......\private.xml
.....\.........\project.properties
.....\.........\project.xml
.....\src
.....\...\Exercise
.....\...\........\CalculateHandicap.form
.....\...\........\CalculateHandicap.java
.....\...\lab
.....\...\...\nonpattern
.....\...\...\..........\CourseRecord.java
__MACOSX
........\Lab11
........\.....\src
........\.....\...\lab
........\.....\...\...\nonpattern
........\.....\...\...\..........\._CourseRecord.java
Lab11\src\lab\nonpattern\CourseViewer.java
__MACOSX\Lab11\src\lab\nonpattern\._CourseViewer.java
Lab11\src\lab\nonpattern\LayoutConstants.java
__MACOSX\Lab11\src\lab\nonpattern\._LayoutConstants.java
Lab11\src\lab\pattern
.....\...\...\.......\BarChartObserver.java
__MACOSX\Lab11\src\lab\pattern
........\.....\...\...\.......\._BarChartObserver.java
Lab11\src\lab\pattern\CourseController.java
__MACOSX\Lab11\src\lab\pattern\._CourseController.java
Lab11\src\lab\pattern\CourseData.java
__MACOSX\Lab11\src\lab\pattern\._CourseData.java
Lab11\src\lab\pattern\CourseRecord.java
__MACOSX\Lab11\src\lab\pattern\._CourseRecord.java
Lab11\src\lab\pattern\LayoutConstants.java
__MACOSX\Lab11\src\lab\pattern\._LayoutConstants.java
Lab11\src\lab\pattern\Observable.java
__MACOSX\Lab11\src\lab\pattern\._Observable.java
Lab11\src\lab\pattern\Observer.java
__MACOSX\Lab11\src\lab\pattern\._Observer.java
Lab11\src\lab\pattern\PieChart.java

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