ArrayList/LinkedList get First Index number

Question

Is is possible to get out of an ArrayList the first number of the first index?

Here's an Example:

In there are 5 items:

path = {0.5,5.0},{0.6,6.0},{0.7,7.0},{0.8,8.0},{0.9,9.0}

And I want to get the number 5.0 out of {0.5,5.0}...

I tried it with path.get(0) But it only gives me {0.5,5.0} back.

Is it possible to get 5.0 out of it without getting all the other numbers?

You have to get the array object from list to get from it second ([1]) element. — Top Sekret, Jan 17 '16 at 10:13

Yassin Hajaj · Answer 1 · 2016-01-18T13:40:21.813

2

If your ArrayList contains arrays, this is the way to go

myList.get(0)[1] // You're getting the index 1 from the 1st array of your ArrayList

Otherwise, if it is containing other ArrayList's

myList.get(0).get(1) // Same logic as above applied to the Collection

edited Jan 18 '16 at 13:40

answered Jan 17 '16 at 10:11

Yassin Hajaj

Collection does not have get(int). – Top Sekret Jan 17 '16 at 10:13
@JakubKaszycki An ArrayList is called a Collection hence it extends AbstractCollection – Yassin Hajaj Jan 17 '16 at 12:02
`Collection` does not have method `E get(int)`. It's method of `List`, I meant – Top Sekret Jan 18 '16 at 19:50
@JakubKaszycki [ArrayList is a Collection](http://stackoverflow.com/questions/3599243/what-is-a-java-collection) and I never said Collection had a get method... But whatever. – Yassin Hajaj Jan 19 '16 at 10:04
You just said "Same logic as above applied to the Collection" – Top Sekret Jan 19 '16 at 19:46

Idos · Accepted Answer · 2016-01-17T10:32:25.860

1

If your curly braces in the ArrayList are actually brackets (they probably are), you can use:

myArray.get(0)[index] to get the index you want. In your example it is:

myArray.get(0)[1];

Note: if your ArrayList elements are also ArrayList then you need to use get(0).get(1) instead of get(0)[1].

edited Jan 17 '16 at 10:32

answered Jan 17 '16 at 09:59

Idos

2 Answers2