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javaarraysumljava.util.scanner

UML diagram java

I'm a little confused and cannot find out how to write this in code from the UML diagram. I know it's a public class, and its first word is the method. I'm confused about the object array inside the method if it even is inside the method. Thanks for your time.

  • getSize(Scanner sc) : Object[]

  • friendOrFamily(Scanner sc) : int

Solution

  • There is no array notation in UML. But the closest thing in UML is multiplicity combined with a type name (e.g. Object) :

    myarray: Object [*]                
myboundedarray: Object[2..5]
myoptional: Object [0..1]

    This means an unlimited number of objects, a bounded list of objects between 2 and 5 elements, and an optional object that can be absent (minimum 0) or present (maximum 1).

    For operations (aka methods), you just indicate it with a colon, after the parameter list:

    getSize(sc: Scanner) : Object[*]

    which describes an operation taking one parameter of type Scanner and returning a container with an undertermined number of elements of type Object.