testgridbaglayout.java

java2 primer plus一书源程序

/*
 * TestGridBagLayout.java
 *
 * Created on July 30, 2002, 11:35 AM
 */

package com.samspublishing.jpp.ch13;

import java.awt.*;
import java.awt.event.*;

/**
 *
 * @author  Stephen Potts
 * @version
 */
public class TestGridBagLayout extends Frame
{
   
   TextField tfFirst;
   TextField tfSecond;
   TextField tfThird;
   TextField tfForth;
   TextField tfFifth;
   GridBagConstraints gbc;
   Button saveButton;
   Label answerLabel;
   
   /** Creates new GridBagLayout */
   public TestGridBagLayout()
   {
      Insets i = new Insets(0, 0, 0, 0);
      
      saveButton = new Button("Save");
      answerLabel = new Label("Answer:");
 
      tfFirst = new TextField("First");
      tfSecond= new TextField("Second");
      tfThird = new TextField("Third");
      tfForth = new TextField("Forth");
      tfFifth = new TextField("Fifth");
      
      GridBagLayout gbl = new GridBagLayout();
      setLayout(gbl);
      
      gbc = new GridBagConstraints(0,0,1,1,0.0,0.0,
                                   GridBagConstraints.EAST,
                                   GridBagConstraints.NONE,
                                   i,0,0);
      gbl.setConstraints(answerLabel, gbc);
      
      gbc = new GridBagConstraints(1,0,1,1,0.0,0.0,
                                   GridBagConstraints.WEST,
                                   GridBagConstraints.NONE,
                                   i,0,0);
      
      gbl.setConstraints(tfFirst, gbc);
      gbc = new GridBagConstraints(1,11,1,1,0.0,0.0,
                                   GridBagConstraints.WEST,
                                   GridBagConstraints.NONE,
                                   i,0,0);
      gbl.setConstraints(tfSecond, gbc);
      gbc = new GridBagConstraints(1,8,1,1,0.0,0.0,
                                   GridBagConstraints.WEST,
                                   GridBagConstraints.NONE,
                                   i,0,0);
      gbl.setConstraints(tfThird, gbc);
      gbc = new GridBagConstraints(2,0,1,1,0.0,0.0,
                                   GridBagConstraints.WEST,
                                   GridBagConstraints.NONE,
                                   i,0,0);
      gbl.setConstraints(tfForth, gbc);
      gbc = new GridBagConstraints(2,1,1,1,0.0,0.0,
                                   GridBagConstraints.WEST,
                                   GridBagConstraints.NONE,
                                   i,0,0);
      gbl.setConstraints(tfFifth, gbc);
     
      gbc = new GridBagConstraints(8,1,1,1,0.0,0.0,
                                   GridBagConstraints.WEST,
                                   GridBagConstraints.NONE,
                                   i,0,0);
      gbl.setConstraints(saveButton, gbc);
    
      
      
      add(tfFirst);
      add(tfSecond);
      add(tfThird);
      add(tfForth);
      add(tfFifth);
      add(answerLabel);
      add(saveButton);
            
      addWindowListener(new WinCloser());
      setTitle("Using a GridBagLayout");
      setBounds( 100, 100, 300, 300);
      setVisible(true);
   }
   
   public static void main(String[] args)
   {
      TestGridBagLayout tgbl = new TestGridBagLayout();
   }
   
}

class WinCloser extends WindowAdapter
{
   public void windowClosing(WindowEvent e)
   {
      System.exit(0);
   }
}