Java Swing How to - Get X and Y index of element inside GridLayout

Question

We would like to know how to get X and Y index of element inside GridLayout.

Answer

/*from  w  w  w  .j av  a2  s .  c om*/
import java.awt.GridLayout;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main {
  private static final int N = 5;
  private final List<JButton> list = new ArrayList<JButton>();

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

  private JButton createGridButton(final int row, final int col) {
    final JButton b = new JButton("r" + row + ",c" + col);
    b.addActionListener(e->{
        JButton gb = Main.this.getGridButton(row, col);
        System.out.println("r" + row + ",c" + col + " " + (b == gb) + " "
            + (b.equals(gb)));
    });
    return b;
  }

  private JPanel createGridPanel() {
    JPanel p = new JPanel(new GridLayout(N, N));
    for (int i = 0; i < N * N; i++) {
      int row = i / N;
      int col = i % N;
      JButton gb = createGridButton(row, col);
      list.add(gb);
      p.add(gb);
    }
    return p;
  }

  private void display() {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.add(createGridPanel());
    f.pack();
    f.setVisible(true);
  }

  public static void main(String[] args) {
    new Main().display();
  }
}