How can I manually assign values to a 2D array in Java?

Asked Oct 27 '15 at 22:30

Active Nov 10 '15 at 06:49

Viewed 31 times

I am learning about 2D arrays but I am stuck on this issue and I don't know what I am doing wrong. I have this so far:

    double[][] arr = new double[3][2];

    arr[0] = {1.0,1.0,1.0,1.0,1.0}; // this doesn't work

but that seems to be wrong for some reason, I get

 Array Initializer is not allowed here

what I am trying to do is make the first column of the first row equal to: 1.0,1.0,1.0,1.0,1.0

I can do it by declaring another array and then setting it equal to the first column of the first row:

    double [] arr1 = {1.0,1.0,1.0,1.0,1.0};
    double[][] arr = new double[3][2];

    arr[0] = arr1; // this seems to work

My question is how can I add the values manually without having to first declare an array and setting it equal to it, or without having to use a for loop.

edit: The answers of the the previous questions were too complicated for me to understand. Thanks for the answers guys, this helped me a lot.

edited Nov 10 '15 at 06:49

asked Oct 27 '15 at 22:30

lokilindo

@MadProgrammer References. – Sotirios Delimanolis Oct 27 '15 at 22:35
Use `arr[0] = new double[] {1.0,1.0,1.0,1.0,1.0};` – Sotirios Delimanolis Oct 27 '15 at 22:36
There's also no point to declare the array as `double[][] arr = new double[3][2];`, just use `double[][] arr = new double[3][];` – Sotirios Delimanolis Oct 27 '15 at 22:38
@SotiriosDelimanolis I'm sorry, it's very early in the morning, so I might have missed what you were trying to say? – MadProgrammer Oct 27 '15 at 22:39
@MadProgrammer I didn't want to be too explicit :p. The `new double[3][2]` is creating an array of 3 array references to 3 arrays of size 2. Nothing prevents you from reassigning one of those to an array of a difference size. – Sotirios Delimanolis Oct 27 '15 at 22:41
@SotiriosDelimanolis Okay, that just freaks the crap out me :P - It's probably very logical and or, but my morning brain just didn't need that right now – MadProgrammer Oct 27 '15 at 22:46

How can I manually assign values to a 2D array in Java?

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