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Just talking about programming.

Then you'd need a remove() method and a update() method and so on and on

What would be the result of add() when the current value is a String and the value to be added is a JComponent?

What would the add() method do?

The key is associated with one value.
What do you mean by "adding a value" to a key?
You can change the value of the value object or you can replace the value object that is associated with the...

Are you sure? I think it has many methods.