Исходный текст программы GridBag2.java

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// ==========================================
// GridBag2.java
//(C) Alexandr Frolov, 1998
// E-mail: frolov@glasnet.ru
// Web:    http://www.glasnet.ru/~frolov 
// ==========================================

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public class GridBag2 extends Applet
  implements ActionListener
{
  TextField tfFirstName;
  Label lbFirstName;
  
  TextField tfMiddleName;
  Label lbMiddleName;
  
  TextField tfLastName;
  Label lbLastName;
  
  TextField tfZip;
  Label lbZip;
  
  TextField tfCountry;
  Label lbCountry;
  
  Button btnOK;
  Button btnCancel;

  // ============================================
  // init
  // ============================================
  public void init()
  {
    tfFirstName = new TextField(20);
    lbFirstName = new Label("First name");
    
    tfMiddleName = new TextField(20);
    lbMiddleName = new Label("Middle name");
    
    tfLastName = new TextField(20);
    lbLastName = new Label("Last name");
    
    tfZip = new TextField(10);
    lbZip = new Label("ZIP code");
    
    tfCountry = new TextField(8);
    lbCountry = new Label("Country");
    
    btnOK = new Button("OK");
    btnCancel = new Button("Cancel");
    
    GridBagLayout gbl = new GridBagLayout();
    GridBagConstraints c = 
      new GridBagConstraints();
    
    setLayout(gbl);
    
// -----------------------
// First name    
// -----------------------

    c.anchor = GridBagConstraints.NORTHWEST; 
    c.fill   = GridBagConstraints.NONE;  
    c.gridheight = 1;
    c.gridwidth  = 1;
    c.gridx = GridBagConstraints.RELATIVE; 
    c.gridy = GridBagConstraints.RELATIVE; 
    c.insets = new Insets(10, 10, 0, 0);
    
    gbl.setConstraints(tfFirstName, c);
    add(tfFirstName);
    
    gbl.setConstraints(lbFirstName, c);
    add(lbFirstName);

// -----------------------
// OK
// -----------------------

    c.gridwidth  = GridBagConstraints.REMAINDER; 
    c.ipadx = 32;
    
    gbl.setConstraints(btnOK, c);
    add(btnOK);
    
// -----------------------
// Middle name
// -----------------------

    c.ipadx = 0;
    c.gridwidth  = 1; 
    
    gbl.setConstraints(tfMiddleName, c);
    add(tfMiddleName);
    
    gbl.setConstraints(lbMiddleName, c);
    add(lbMiddleName);

// -----------------------
// Cancel
// -----------------------

    c.gridwidth  = GridBagConstraints.REMAINDER; 
    c.ipadx = 10;
    c.weightx = 1.0;
    
    gbl.setConstraints(btnCancel, c);
    add(btnCancel);
    
// -----------------------
// Last name
// -----------------------

    c.ipadx = 0;
    c.gridwidth  = 1; 
    c.weightx = 0.0;
    
    gbl.setConstraints(tfLastName, c);
    add(tfLastName);
    
    c.gridwidth  = GridBagConstraints.REMAINDER; 
    
    gbl.setConstraints(lbLastName, c);
    add(lbLastName);
    
// -----------------------
// ZIP
// -----------------------
    
    c.gridwidth  = 1; 
    
    gbl.setConstraints(tfZip, c);
    add(tfZip);
    
    c.gridwidth  = GridBagConstraints.REMAINDER; 
    
    gbl.setConstraints(lbZip, c);
    add(lbZip);
    
// -----------------------
// Country
// -----------------------

    c.gridwidth  = 1; 
    
    gbl.setConstraints(tfCountry, c);
    add(tfCountry);
    
    c.weighty = 1.0;
    c.gridwidth  = GridBagConstraints.REMAINDER; 
    
    gbl.setConstraints(lbCountry, c);
    add(lbCountry);
    
// -----------------------
    
    btnOK.addActionListener(this);
    btnCancel.addActionListener(this);
  }
  
  // ============================================
  // actionPerformed
  // ============================================
  public void actionPerformed(ActionEvent e)
  {
    AppletMsgBox amsgbox;
    String s = "<Personal information>";
    
    if(e.getSource().equals(btnOK))
    {
      s = "First name: " + 
        tfFirstName.getText() + 
	"\nMiddle name: " + 
        tfMiddleName.getText() +
	"\nLast name: " + 
        tfLastName.getText() +
	"\nZIP code: " + tfZip.getText() +
	"\nCountry: " + tfCountry.getText();
	
      amsgbox = new AppletMsgBox(s,
       "Information");
      amsgbox.show();
    }
    
    else if(e.getSource().equals(btnCancel))
    {
      tfFirstName.setText("");
      tfMiddleName.setText("");
      tfLastName.setText("");
      tfZip.setText("");
      tfCountry.setText("");
    }
  }
  
  // ============================================
  // getAppletInfo
  // ============================================
  public String getAppletInfo()
  {
    return "Name: GridBag2";
  }
}

// ============================================
// Class AppletMsgBox
// ============================================
class AppletMsgBox extends Frame
  implements ActionListener
{
  Button btnOK;
  TextArea ta;
  
  // ============================================
  // AppletMsgBox
  // ============================================
  public AppletMsgBox(String msg, String title)
  {
    super(title);
    setSize(400, 200);
    
    btnOK = new Button("OK");
    ta = new TextArea(msg, 5, 40);
    ta.setEditable(false);
    
    GridBagLayout gbl = new GridBagLayout();
    GridBagConstraints c = 
      new GridBagConstraints();
    
    setLayout(gbl);
    
    c.anchor = GridBagConstraints.CENTER; 
    c.fill   = GridBagConstraints.BOTH;  
    c.gridheight = 1;
    c.gridwidth  = GridBagConstraints.REMAINDER; 
    c.gridx = GridBagConstraints.RELATIVE; 
    c.gridy = GridBagConstraints.RELATIVE; 
    c.insets = new Insets(10, 0, 0, 0);
    
    gbl.setConstraints(ta, c);
    add(ta);
    
    c.fill   = GridBagConstraints.NONE;  
    c.ipadx = 35;
    gbl.setConstraints(btnOK, c);
    add(btnOK);
    
    btnOK.addActionListener(this);
  }
  
  // ============================================
  // actionPerformed
  // ============================================
  public void actionPerformed(ActionEvent e)
  {
    if(e.getSource().equals(btnOK))
    {
      setVisible(false);
    }
  }
}

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