<1> defines the interface Quadrable.java <2> to define multiple classes computable Graphics Graphics area (at least three: Circle, Rectangle, Triangle). Each class was required to implement the interface Quadrable, located in shape package. Other parts of the class may need to set up, such as: Triangle class definition, you can have three side lengths represent data fields. <3> defines a Client class, where the main method of establishing an ArrayList and an array of calling ShapeUtils class and two methods of calculating the area.

AddArea
.......\build
.......\build.xml
.......\.....\built-jar.properties
.......\.....\classes
.......\.....\.......\shape
.......\.....\.......\.....\Circle.class
.......\.....\.......\.....\Circle.java
.......\.....\.......\.....\Client.class
.......\.....\.......\.....\Client.java
.......\.....\.......\.....\Quadrable.class
.......\.....\.......\.....\Quadrable.java
.......\.....\.......\.....\Rectangle.class
.......\.....\.......\.....\Rectangle.java
.......\.....\.......\.....\ShapeUtils.class
.......\.....\.......\.....\ShapeUtils.java
.......\.....\.......\.....\Triangle.class
.......\.....\.......\.....\Triangle.java
.......\.....\empty
.......\.....\generated-sources
.......\.....\.................\ap-source-output
.......\dist
.......\....\README.TXT
.......\manifest.mf
.......\nbproject
.......\.........\build-impl.xml
.......\.........\genfiles.properties
.......\.........\private
.......\.........\.......\config.properties
.......\.........\.......\private.properties
.......\.........\.......\private.xml
.......\.........\project.properties
.......\.........\project.xml
.......\src
.......\...\shape
.......\...\.....\Circle.java
.......\...\.....\Client.java
.......\...\.....\Quadrable.java
.......\...\.....\Rectangle.java
.......\...\.....\ShapeUtils.java
.......\...\.....\Triangle.java

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