Designing Graphical Interfaces - Beginning Java Programming: The Object-Oriented Approach - page 480

private static void addButtons(Container contentPane, String ... strings) {
for (String label : strings) {
contentPane.add(new JButton(label));
}
}

}

2.

Run the project from Eclipse. You should see the window shown in Figure 11-12.

figure 11-12

3. The buttons don't do anything (yet) and are pretty useless for now, but you can see already that

you will need to add a textbox for any calculations. It is probably also apparent that it's not good
to cram this into a single cell. It would be better to span this text the width of a whole row. Why
not put your buttons in a JPanel and the textfield in the north position of the BorderLayout lay-
out manager? Change your class to look like this:
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;

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

public class GridLayoutFrame {

public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("GridLayout frame");

JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(4, 4));

addButtons(buttonPanel,
"7", "8", "9", "0", "4", "5", "6", "C",