Labor – Console Output and Calculations

We will use geometrical objects to get used Write the classes specified below and do thorough testing with BlueJ:

1. Class "Rectangle"

Rectanglelength: intwidth: intConstructor(length: int, width: int)getLength(): intgetWidth(): intsetLength(length: int)setWidth(width: int)calcCircumference(): intcalcArea(): intprintInfo()
Hints

  • The constructor has to use the setters

  • printInfo() should print all infos of the rectangle to the console.

  • the Constructor within UML has to be named exactly after the class I(including the uppercase first letter): Rectangle

  • in UML the declaration ordering is +/- name : type, in Java it is public/private type name!

  • "circumference" is the German "Umfang"

    Example:

    ===== Rectangle: =====
  Length = 5m
  Width = 2m
  Circumference = 14m
  Area = 10m²
======================

  • Do not reimplement the calculations, but simply call the methods where this value is needed.

2. Class "Circle"

Circleradius: doublepi: doubleConstructor(radius: double)getRadius(): doublesetRadius(neuerRadius: double)calcCircumference(): doublecalcArea(): doubleprintInfo()
Hints

  • The needed value of π should be provided by an attribute with double value 3.14159265.

  • Again please no calculations within method printInfo() – call the existing methods instead!

3. Class "Cuboid" (Quader)

Cuboidlength: int // in mwidth: int // in mheight: int // in mdensity: int // in kg/m³Constructor Quader(lenght: int, width: int, height: int, density: int)getLength( ): intsetLength(length: int)...other_Getters+Setters()calcSurfaceArea(): intcalcVolume(): intcalcMass(): intprintInfo()
Hints

  • Formulas for surface area (sum of all enclosing areas) and volume should be known!

  • mass = density * volume

  • check the calculated values for correctness !

    Typical density values for several materials:
    Water: 1000 kg/m³
    Steel: 7860 kg/m³
    Wood: 400 to 800 kg/m³
    Concrete: 1800 to 2450 kg/m³

4. More Classes (Cylinder, Sphere, …​)

If you finished early, you should think about implementing other classes for geometrical objects (cylinder, sphere, cone, …​). Formulas are available online.

5. Further Info

Links to topics "data types" and "arithmetische operators" in Java: