Description: (1) design a program based on user input for the command line parameters to calculate the number of rectangular, square, triangle area. If the input parameter is one, two, three then they should correspond to a square, rectangle, triangle, without parameters, exception handling through the real error message. (Used to calculate the area is an overloaded method. Note: the definition of an abstract parent class, and provides an abstract method area (). To send birth to three sub-classes override area () method, and then in main method using multi-state to achieve a specific area of a function call).
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File list (Check if you may need any files):
Count\.classpath
.....\.project
.....\area.class
.....\count.class
.....\count.java
.....\MyException1.class
.....\MyException2.class
.....\Rectangle.class
.....\Square.class
.....\Triangle.class
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