For example, I could write either of these:

class example <T>
{
    ...

    public void insert (T data)
    {
        ...
    }
}

or

class example
{
    ...

    public void insert (Object o)
    {
        ...
    }
}

Is there a signficant difference between the 2 in terms of performance? With generics I could restrict the type of the parameter and with the second approach I guess it wouldn't be necessary to define the type of the object as it is created.

Also, with the second approach I could basically insert anything into the class, right? Whereas with generics every element in the class would be of the same type.

Anything else I'm missing?

java generics
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