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.

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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