How to randomly select elements of array for changing button text?

I have almost managed to get my program working, but there is still one last bit I am having trouble with. I do not believe anybody has asked this question yet, because I am trying to select a JButton according to an array value which has been randomly selected. I generated one hundred JButtons on a grid, and I want to randomly select twenty for changing their text. Problem is, the text is not changing! So I am thinking I have not really selected any buttons. My problem code is as follows:

for (int i = 0; i < 20; i++)
{
    Random randomRow = new Random(10);
    Random randomColumn = new Random(10);
    if (button == buttons[randomRow.nextInt(10)+1][randomColumn.nextInt(10)+1])
    {
        button.setText("treasure");
    }
}