Question

Can I increase the stack and the heap in java? I’m using BlueJ.

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EDIT:

Here is the code:

// ***** Quick-Sort Method *****

public static void quickSort(int[] data, int first, int n)
{
    int p, n1, n2;
    if(n > 1)
    {
        p = partition(data, first, n);
        n1 = p - first;
        n2 = n - n1 - 1;
        quickSort(data, first, n1);
        quickSort(data, p+1, n2);
    }
}

// ***** PRIVATE HELPER FUNCTIONS *****

public static void quickSort(int[] data)
{
    quickSort(data, 0, data.length);
}

private static int partition(int[] A, int first, int n )
{
    int right = first + n - 1;
    int ls = first;
    int pivot = A[first];
    for(int i = first+1; i <= right; i++)
    {
        if(A[i] <= pivot)
        // Move items smaller than pivot only, to location that would be at left of pivot
        {
            ls++;
            swap(A, i, ls);
        }
    }
    swap(A, first, ls);
    return ls;
}

private static void swap(int[] data, int pos1, int pos2)
{
    int temp = data[pos1];
    data[pos1] = data[pos2];
    data[pos2] = temp;
}

Answer 1

You can use the following JVM options:

• -Xms initial java heap size
• -Xmx maximum java heap size
• -Xss Set thread stack size

If you want to set these options by default in BlueJ, you need to do the following:

• Find bluej.defs file
• Find bluej.vm.args property (line) within that file
• Add the option that you want in that line, i.e. bluej.vm.args = -Xmx512m to set the heap size to a maximum of 512 MB.

I hope this helps.