tokentest.java

《Java面向对象程序设计》例子源代码.轻松学习书本.

//TokenTest.java
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TokenTest extends JFrame {
   private JLabel promptLabel;
   private JTextField inputField;
   private JTextArea outputArea;
   public TokenTest(){
      super( "测试StringTokenizer类" );
      Container container = getContentPane();
      container.setLayout( new FlowLayout() );
      promptLabel = new JLabel( "输入一个句子，然后按回车" );
      container.add( promptLabel );
      inputField = new JTextField( 20 );
      inputField.addActionListener(
         new ActionListener() {  
            public void actionPerformed( ActionEvent event ){      
               //调用StringTokenizer构造函数以JTextField字段中的字符串
               //（event.getActionCommand()）建立对象tokens 
               StringTokenizer tokens =
                  new StringTokenizer( event.getActionCommand() );
               //调用StringTokenizer类的方法countTokens
               outputArea.setText( "Number of elements: " +
                  tokens.countTokens() + "\nThe tokens are:\n" );
               //调用StringTokenizer类的方法hasMoreTokens方法
               while ( tokens.hasMoreTokens() )
                  //调用StringTokenizer类的方法nextToken方法
                  outputArea.append( tokens.nextToken() + "\n" );
            }
         } 
      ); 
     container.add( inputField );
     outputArea = new JTextArea( 10, 20 );
     outputArea.setEditable( false );
     container.add( new JScrollPane( outputArea ) );
     setSize( 275, 240 );  
     setVisible( true );  
   }
   public static void main( String args[] ){
      TokenTest application = new TokenTest();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   } 
}