Is it possible to use an Integer to call methods and arrays dynamically?

Is it possible to use an Integer to call methods and arrays dynamically?

For example:
3 methods exist
"map1method,
map2method,
map3mehtod"
and I want to call the right one depending on what the integer 'activemap'
has currently stored in it.
I could do an If statement
"If (activemap == 1)
map1method;
elseif (activemap ==2)
..."
But is there a possible way of using the integer more efficiently?
Like a "map(activemap)method"
Also could I also call a specific array in a batch of them in the same
fashion.
This is all in java by the way.