How Can I Efficiently Retrieve the X and Y Indexes of Elements in a Java GridLayout?

Retrieving X and Y Indexes of Elements Within a GridLayout

In Java, locating the X/Y indexes of a specific element within a GridLayout can be achieved through a more efficient approach than manually iterating through a bidimensional array. The following method demonstrates how to obtain the button reference based on its grid coordinates:

private JButton getGridButton(int r, int c) {
    int index = r * N + c;
    return list.get(index);
}

This method takes row r and column c as parameters and calculates the index in the underlying list of buttons (list). By accessing the element at that index, we retrieve the corresponding button reference.

To demonstrate this, the following code creates a grid of 5x5 buttons and adds a click listener to each button. When a button is clicked, the click listener compares the found button reference with the original button reference to verify their identity:

private JButton createGridButton(final int row, final int col) {
    final JButton b = new JButton("r" + row + ",c" + col);
    b.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            JButton gb = GridButtonPanel.this.getGridButton(row, col);
            System.out.println("r" + row + ",c" + col
                + " " + (b == gb)
                + " " + (b.equals(gb)));
        }
    });
    return b;
}

By leveraging this method, we can efficiently retrieve the X and Y indexes of any button within the GridLayout, making it easier to perform various actions on specific grid elements.

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