Description: define a interface,including which containing at least a can of calculating the area of members of the methoda,Then, write to realize this interface of two classes: the square class and round types.Then write a with generics characteristics of classes,In this class can be required to exploit the console window in the area of the output didn t swollen graphics，And this kind of type variable corresponds to the actual type may be written in front of the class and round square class.Finally, using the generic type with the characteristics of the categories in the console window respectively output given variable-length square area and give you a radius of the area of a circle.
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枚举5_3\.classpath
.......\.project
.......\bin\E_WEEKDAY.class
.......\...\J_Enum.class
.......\src\J_Enum.java
.......\bin
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枚举5_3
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