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Java Swing - 如何防止GridBagLayout调整列大小

layout 【layout】
我们想知道如何防止GridBagLayout调整列大小。
代码展示 运行结果 
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.WindowConstants;

public class Main {
  static int value = 99;

  public static void main(String[] args) {
    JFrame frame = new JFrame();
    final JLabel valueLabel = new JLabel(String.valueOf(value));
    JButton decButton = new JButton("-");
    decButton
        .addActionListener(e -> valueLabel.setText(String.valueOf(--value)));

    JButton incButton = new JButton("+");
    incButton
        .addActionListener(e -> valueLabel.setText(String.valueOf(++value)));

    JPanel panel = new JPanel();
    panel.setLayout(new GridBagLayout());
    GridBagConstraints c = new GridBagConstraints();
    c.weightx = 1;
    c.gridx = 0;
    c.gridy = 0;
    panel.add(decButton, c);
    c.gridx = 1;
    panel.add(valueLabel, c);
    c.gridx = 2;
    panel.add(incButton, c);

    c.gridy = 1;
    int w = 32;
    for (c.gridx = 0; c.gridx < 3; c.gridx++) {
      panel.add(Box.createHorizontalStrut(w), c);
    }

    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    frame.add(panel);
    frame.pack();
    frame.setVisible(true);
  }
}