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import java.awt.Container;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
public class GridTest extends JFrame {
public static void main(String[] args) {
int rows = 2;
int cols = 3;
GridTest gt = new GridTest(rows, cols);
gt.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gt.pack();
gt.setVisible(true);
}
public GridTest(int rows, int cols) {
Container pane = getContentPane();
pane.setLayout(new GridLayout(rows, cols));
for (int i = 0; i < 20; i++) {
JButton button = new JButton(Integer.toString(i + 1));
pane.add(button);
}
}
}
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