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GridBagLayout with weight constraint

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class GridBagWithWeight {   public static void main(String[] args) {     JFrame f = new JFrame(         "Demonstrates the use of fill constraints");     JPanel p = new JPanel(new GridBagLayout());     GridBagConstraints c = new GridBagConstraints();     c.insets = new Insets(2, 2, 2, 2);     c.weighty = 1.0;     c.weightx = 1.0;     c.gridx = 0;     c.gridy = 0;     c.gridheight = 2;     c.fill = GridBagConstraints.BOTH; // Use both horizontal & vertical     p.add(new JButton("Java"), c);     c.gridx = 1;     c.gridheight = 1;     c.gridwidth = 2;     c.fill = GridBagConstraints.HORIZONTAL; // Horizontal only     p.add(new JButton("Source"), c);     c.gridy = 1;     c.gridwidth = 1;     c.fill = GridBagConstraints.NONE; // Remember to reset to none     p.add(new JButton("and"), c);     c.gridx = 2;     c.fill = GridBagConstraints.VERTICAL; // Vertical only     p.add(new JButton("Support."), c);     WindowListener wndCloser = new WindowAdapter() {       public void windowClosing(WindowEvent e) {         System.exit(0);       }     };     f.addWindowListener(wndCloser);     f.getContentPane().add(p);     f.setSize(600, 200);     f.show();   } }