This is an attribute of abstract class, as well as the return value, a good understanding.

countTest
.........\bak
.........\...\counttest
.........\...\.........\Cylinder.java~1~
.........\...\.........\Cylinder.java~2~
.........\...\.........\Rectangle.java~1~
.........\...\.........\TestGeometricObject.java~10~
.........\...\.........\TestGeometricObject.java~11~
.........\...\.........\TestGeometricObject.java~12~
.........\...\.........\TestGeometricObject.java~13~
.........\...\.........\TestGeometricObject.java~14~
.........\...\.........\TestGeometricObject.java~15~
.........\...\.........\TestGeometricObject.java~6~
.........\...\.........\TestGeometricObject.java~7~
.........\...\.........\TestGeometricObject.java~8~
.........\...\.........\TestGeometricObject.java~9~
.........\...\.........\Triangle.java~13~
.........\...\.........\Triangle.java~14~
.........\...\.........\Triangle.java~15~
.........\...\.........\Triangle.java~16~
.........\...\.........\Triangle.java~17~
.........\...\.........\Triangle.java~18~
.........\...\.........\Triangle.java~19~
.........\...\.........\Triangle.java~20~
.........\...\.........\Triangle.java~21~
.........\...\.........\Triangle.java~22~
.........\classes
.........\.......\counttest
.........\.......\.........\Circle.class
.........\.......\.........\Cylinder.class
.........\.......\.........\GeometricObject.class
.........\.......\.........\Rectangle.class
.........\.......\.........\TestGeometricObject.class
.........\.......\.........\Triangle.class
.........\.......\package cache
.........\.......\.............\counttest.dep2
.........\countTest.jpx
.........\countTest.jpx.local
.........\countTest.jpx.local~
.........\src
.........\...\counttest
.........\...\.........\Circle.java
.........\...\.........\Cylinder.java
.........\...\.........\GeometricObject.java
.........\...\.........\Rectangle.java
.........\...\.........\TestGeometricObject.java
.........\...\.........\Triangle.java
.........\...\.........\Triangle.jbx

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