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

public class Words extends Applet{
   private static final Pattern word=new Pattern("\\w+");
   
   Label lText=new Label("Enter a text:");
   TextArea textInput=new TextArea(10,40);
   Button bClear=new Button("Clear text");
   Label lCount=new Label("Word count:");
   TextField display=new TextField(5);
   Button bCount=new Button("Count");
   
   public void init(){
      GridBagLayout gb=new GridBagLayout();
      setLayout(gb);
      GridBagConstraints gbc=new GridBagConstraints();
      gbc.fill=gbc.BOTH;
      gbc.insets=new Insets(2,4,2,4);
      
      gbc.gridwidth=gbc.RELATIVE;
      gb.setConstraints(lText,gbc);
      add(lText);
      gbc.gridwidth=gbc.REMAINDER;
      gbc.fill=gbc.NONE;
      gbc.anchor=gbc.EAST;
      gb.setConstraints(bClear,gbc);
      gbc.fill=gbc.BOTH;
      gbc.anchor=gbc.CENTER;
      add(bClear);
      gbc.weighty=1;
      gb.setConstraints(textInput,gbc);
      gbc.weighty=0;
      add(textInput);
      
      gbc.gridwidth=1;
      gbc.fill=gbc.BOTH;
      gb.setConstraints(lCount,gbc);
      add(lCount);
      gb.setConstraints(display,gbc);
      add(display);
      
      gbc.gridwidth=gbc.REMAINDER;
      gb.setConstraints(bCount,gbc);
      add(bCount);
      
      display.setEditable(false);
      
      textInput.addTextListener(new TextListener(){
         public void textValueChanged(TextEvent e){
            display.setText(null);
         }
      });
      
      bClear.addActionListener(new ActionListener(){
         public void actionPerformed(ActionEvent e){
            textInput.setText(null);
         }
      });
      
      bCount.addActionListener(new ActionListener(){
         public void actionPerformed(ActionEvent e){
            display.setText(String.valueOf(countWords(textInput.getText())));
         }
      });
   }
   
   private static int countWords(String s){
      Matcher m=word.matcher(s);
      int c=0;
      while(m.find()){
         c++;
      }
      return c;
   }
}