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  1. #1
    rblmvs is offline Member
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    Default java 2 dimensional no size list

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

  2. #2
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    sunde887 is offline Moderator
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    Look up lists and how to use them.

  3. #3
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    Quote Originally Posted by rblmvs View Post
    Hi,
    i want to 2 dimensional no size list, like matrix. But i dont find. Please help me.
    Do you want this?

    Java Code:
    List<List<Double>> matrix= new ArrayList<List<Double>>();
    kind regards,

    Jos
    The only person who got everything done by Friday was Robinson Crusoe.

  4. #4
    rblmvs is offline Member
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    Quote Originally Posted by sunde887 View Post
    Look up lists and how to use them.
    thanks for your help !

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    rblmvs is offline Member
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    Quote Originally Posted by JosAH View Post
    Do you want this?

    Java Code:
    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 ?

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    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

    Java Code:
    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.

  7. #7
    JosAH's Avatar
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    Quote Originally Posted by rblmvs View Post
    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
    The only person who got everything done by Friday was Robinson Crusoe.

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