How to represent indexed or parametrized attributes in UML? For example, how to reverse

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Editorial Team

Asked: June 15, 20262026-06-15T19:14:47+00:00 2026-06-15T19:14:47+00:00

How to represent indexed or parametrized attributes in UML?

For example, how to reverse the following Java code:

 class MyClass {

       Object getValue(String key);
       void setValue(String key, Object value);

 }

From the one hand I can describe it simple

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but this will not show that these 2 methods are related.

From the other hand I can describe it

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but this will hide the fact, that multiple instances of a value are named by key parameter.

The similar problem arise with the following C# code:

class MyClass
{
    public string this[int i]
    {
        get
        {
        }
        set
        {
        }
    }
}

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Editorial Team · Answer 1 · 2026-06-15T19:14:49+00:00

Editorial Team

There isn’t a great answer for this since this class is in effect a dictionary/hash. A discussion of options you can choose be found here:

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