Java Swing How to - Create JPanel filled with Buttons inside a JScrollPane

Question

We would like to know how to create JPanel filled with Buttons inside a JScrollPane.

Answer

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
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import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class Main {
  public static void main(String[] args) {

    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    int x = 5;
    int y = 5;
    JPanel panel = new JPanel();
    panel.setLayout(new GridLayout(x, y));
    for (int i = 0; i < x * y; i++) {
      JButton button = new JButton(String.valueOf(i));
      button.setPreferredSize(new Dimension(100, 100));
      panel.add(button);
    }
    JPanel container = new JPanel(new FlowLayout(FlowLayout.CENTER, 0, 0));
    container.add(panel);
    JScrollPane scrollPane = new JScrollPane(container);
    f.getContentPane().add(scrollPane);

    f.pack();
    f.setLocationRelativeTo(null);
    f.setVisible(true);
  }
}