ボタンを広げる方法Java

私はJava Appletを作成しようとしていましたが、私はJava Webサイトを見ていて、編集した素晴らしい例が見つかりました。ボタンを広げる方法Java

この例では、ヘッダーのような3つのボタンと、フッターのようなのようなものと、ボディのようなものがあります。私の問題は、中間の（ボディ）ボタンが完全には伸びないということです。

このコードを実行すると、私の意図がわかります。

import java.awt.*; 
import javax.swing.JButton; 
import javax.swing.JFrame; 

public class main { 
    final static boolean shouldFill = true; 
    final static boolean shouldWeightX = true; 
    final static boolean RIGHT_TO_LEFT = false; 

    public static void addComponentsToPane(Container pane) { 
     if (RIGHT_TO_LEFT) { 
      pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT); 
     } 

     JButton button; 
    pane.setLayout(new GridBagLayout()); 
    GridBagConstraints c = new GridBagConstraints(); 
    if (shouldFill) { 
    //natural height, maximum width 
    c.fill = GridBagConstraints.HORIZONTAL; 
    } 


    button = new JButton("hi"); 
    c.fill = GridBagConstraints.HORIZONTAL; 
    c.weightx = 0.5; 
    c.gridx = 1; 
    c.gridy = 0; 
    c.ipady = 40; 
    pane.add(button, c); 

    button = new JButton("Hello, i will not expand"); 
    c.fill = GridBagConstraints.BOTH; 
    c.weighty = 1.0; //request any extra vertical space 
    c.weightx=1.0; 
    c.anchor = GridBagConstraints.CENTER; //bottom of space 
    c.insets = new Insets(10,0,0,0); //top padding 
    c.gridx = 1;  //aligned with button 2 
    c.gridy = 1;  //third row 
    pane.add(button, c); 


    button = new JButton("fr"); 
    c.fill = GridBagConstraints.HORIZONTAL; 
    c.ipady = 0;  //reset to default 
    c.weighty = 1.0; //request any extra vertical space 
    c.anchor = GridBagConstraints.PAGE_END; //bottom of space 
    c.insets = new Insets(10,0,0,0); //top padding 
    c.gridx = 1;  //aligned with button 2 
    c.gridwidth = 2; //2 columns wide 
    c.gridy = 2;  //third row 
    pane.add(button, c); 
    } 

    /** 
    * Create the GUI and show it. For thread safety, 
    * this method should be invoked from the 
    * event-dispatching thread. 
    */ 
    private static void createAndShowGUI() { 
     //Create and set up the window. 
     JFrame frame = new JFrame("main"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     //Set up the content pane. 
     addComponentsToPane(frame.getContentPane()); 

     //Display the window. 
     frame.pack(); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     //Schedule a job for the event-dispatching thread: 
     //creating and showing this application's GUI. 
     javax.swing.SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
       createAndShowGUI(); 
      } 
     }); 
    } 
}

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