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Filling the Entire Column

import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class GridBagLayoutColumnSpanHORIZONTAL {   public static void main(String[] args) {     JFrame f = new JFrame();     f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     Container pane = f.getContentPane();     pane.setLayout(new GridBagLayout());     GridBagConstraints gbc = new GridBagConstraints();     gbc.gridx = 1;     gbc.gridy = GridBagConstraints.RELATIVE;     pane.add(new JButton("First row, first column"), gbc);     pane.add(new JButton("Second row"), gbc);     gbc.gridwidth = 2;     gbc.fill = GridBagConstraints.HORIZONTAL;     pane.add(new JButton("Third row, spans two columns"), gbc);     gbc.gridwidth = 1;     gbc.fill = GridBagConstraints.NONE;     gbc.gridx = GridBagConstraints.RELATIVE;     pane.add(new JButton("First row, second column"), gbc);     f.setSize(400, 300);     f.setVisible(true);   } }