Re: changing array dimension in a method

"Ted Hopp" <>
Sun, 12 Nov 2006 23:25:18 -0500
The reason the array isn't changed is that object references are passed by
value. So when you assign a new array to the formal parameter myArray2
inside changeDimMyArray(), the array reference myArray in main() is not
affected at all. So you can't "change the dim of array from inside the
method". But you can easily do something nearly as good: change the
changeDimMyArray() method to return the redimensioned array. It might look
something like this:

public void changeDimMyArray(int myArray[][])
    // figure out the desired new array sizes

    myNewArray = new int[newRow][newCol];

    // do more stuff, like copy values from myArray to myNewArray

    return myNewArray;

Then, back in main, you can call it like this:

myArray = changeDimMyArray(myArray);

That will change the object to which myArray refers. Bear in mind that
unless you've assigned the original array reference to another variable, the
original array will be beyond reach of your program and headed for the
garbage collector.

Hope this helps,

Ted Hopp

"Daniel Malek" <> wrote in message

Dear All

I am new to java and appreciate your help with my question:

I have a two dimensional array (myArray) and need to change its
dimensions to different rows and columns depending on certain criteria . I
have a method that takes the array to reinitialize it to change its
dimensions. However , the original array dimensions can not be changed
within the method.

public static void main(String[] args) throws Exception {
int[][] myArray;
myArray=new int[1][4];

for (i=0;i<4;i++)


public void changeDimMyArray(int myArray2[][])

// Some operations to calculate n1 and n2.....

myArray2=new int[newRow][newCol];


Could you please advise how I can change the dim of array from inside the
method "changeDimMyArray"?

Thank you

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