use polymorphism programming, the creation of a square type, seeking to achieve triangle, square and circular area. Methods// abstract of a shared type, function for a definition of area public interfaces. Re-definition of the area for the area// function, in the main category to create different types of objects, and different shapes for the area

Packet : 95302957hellooooo.rar filelist
第二题作业\HelloWorld.class
第二题作业\seck\cat.class
第二题作业\seck\cat.java
第二题作业\seck\dog.class
第二题作业\seck\dog.java
第二题作业\seck\duck.class
第二题作业\seck\duck.java
第二题作业\seck
第二题作业\HelloWorld.java
第二题作业

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