java 2 dimensional no size list

[rblmvs]

Hi,
i want to 2 dimensional no size list, like matrix. But i dont find. Please help me.

[sunde887]

Look up lists and how to use them.

[JosAH]

Hi,
i want to 2 dimensional no size list, like matrix. But i dont find. Please help me.

Do you want this?

List<List<Double>> matrix= new ArrayList<List<Double>>();

kind regards,

Jos

[rblmvs]

Look up lists and how to use them.

thanks for your help !

[rblmvs]

Do you want this?

List<List<Double>> matrix= new ArrayList<List<Double>>();

kind regards,

Jos

yes i tried this but i thought if i want to 4 dimensional list List<List<List<List<Double>>>> ?

Double[][] matrix = new Double[][](); Like this ?

[sunde887]

No, in a list you specify what it's a list of with generics.

So the list jos showed you was a list where each item is a list of double.

A three d list would be a list where each item is a 2d list.

A four d list would be a list where each item is a 3d list

List<List<List<List<Double>>>> fourD = new Arraylist<List<List<List<Double>>>();

Is what it should loop like, you can test it by adding some items to it and print them.

[JosAH]

yes i tried this but i thought if i want to 4 dimensional list List<List<List<List<Double>>>> ?

Double[][] matrix = new Double[][](); Like this ?

Yep that'd model a four dimensional List of Doubles, but what is that two dimensional array doing there?

kind regards,

Jos