array

Question

what is the correct way to create an array ? 

Answer 1

in java an array is created as

type[] name;

for example
int[] ages;

but i would recomend arraylists since they are dynamicly resizing whereas arrays are fixed length

arraylist:

ArrayList<type> = new ArrayList<type>(initialSize);

for example

ArrayList<Int> ages = new ArrayList<Int>(50);

to add you do

ages.add(thing)
to remove you do

ages.remove(indexOfThing)

to insert you do

ages.set(index,thing)
!the list needs to already be big enough to put in the item

to get the size you do

ages.size()

and to make sure the array is the big enough you do

ages.ensure(size)

hope this helps

Answer 2

is writing a double is right ? or its just string

Answer 3

int a[ ]=new int[4];
This will create array of 4 elements starting from 0 indices to 3 indices.