how to use genirics in collection

[ashokreddy.narra]

hai....
how can i use vector to accept any type of values?
means i want to use vector to hold any type of value(that is it may be one String,one float,one int,one double)

[JosAH]

hai....
how can i use vector to accept any type of values?
means i want to use vector to hold any type of value(that is it may be one String,one float,one int,one double)

You have to use the 'wildcard' notation:

Vector<?> vec= new Vector<?>();

Vector vec can contain any type of object.

kind regards,

Jos

[Tolls]

And also think really, really hard about whether you actually want to be doing this...and think whether you could write a class that would better represent the data going into the Vector, and make it a Vector<MyClass> instead.

Mixing datatypes in a Collection is usually a recipe for bugs.

[JosAH]

And also think really, really hard about whether you actually want to be doing this...and think whether you could write a class that would better represent the data going into the Vector, and make it a Vector<MyClass> instead.

Mixing datatypes in a Collection is usually a recipe for bugs.

I've used it once: a Map<String, ?> where the key represents a logical name and the value either is the class name to load or an instance of such a class in which case the object is 'cacheable', i.e. there's only one instance of it.

Most of the time such collections end up as the recipient for ResultSets or similar; they're indeed a source of trouble ...

kind regards,

Jos