Shapes Thing result in string

The following text was written to the standard output stream when the ShapesThing.java program was executed from IntelliJ.


Boundary Square = 
Area of the boundary square = 160000.0
Perimeter of the boundary square = 1600.0
Diagonal of the boundary square = 565.685424949238
Disk = 
Area of the disk = 125663.70614359173
Perimeter of the disk = 1256.6370614359173
Diameter of the disk = 400.0
Radius of the disk = 200.0
inner square = 
Area of the inner square = 80000.0
Perimeter of the inner square = 1131.370849898476
Diagonal of the inner square = 400.0