The following text was written to the standard output stream when the ShapesThing.java program was executed from IntelliJ.
square side=400.0 area of square= 160000.0 perimeter of square= 1600.0 diagonal of square=565.685424949238 circle radius=200.0 area of disk= 125663.70614359173 perimeter of disk= 1256.6370614359173 diamond side=282.842712474619 area of the diamond= 80000.0