Description: According to the four points in the first quadrant (both coordinates are in the 0 to 20), to determine whether they can form a rectangle, and then determine whether the rectangle is a square, and outputting the related information. Some errors in the process throws exception.
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File list (Check if you may need any files):
Retangle\.classpath
........\.project
........\.settings\org.eclipse.jdt.core.prefs
........\bin\Coordinate.class
........\...\CoordinateOutOfRangeException.class
........\...\Main.class
........\...\NotRetangleException.class
........\...\Retangle.class
........\...\Vector.class
........\src\Coordinate.java
........\...\CoordinateOutOfRangeException.java
........\...\Main.java
........\...\NotRetangleException.java
........\...\Retangle.java
........\...\Vector.java
........\.settings
........\bin
........\src
Retangle
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