// Fig. 11.15: StaticCharMethods.java
// Static Character testing methods and case conversion methods.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class StaticCharMethods extends JFrame {
   private char c;
   private JLabel promptLabel;
   private JTextField inputField;
   private JTextArea outputArea;

   // constructor builds GUI
   public StaticCharMethods()
   {
      super( "Static Character Methods" );

      Container container = getContentPane();
      container.setLayout( new FlowLayout() );

      promptLabel = new JLabel( "Enter a character and press Enter" );
      container.add( promptLabel );
      inputField = new JTextField( 5 );

      inputField.addActionListener(

         new ActionListener() {  // anonymous inner class

            // handle textfield event
            public void actionPerformed( ActionEvent event )
            {  
               String s = event.getActionCommand();
               c = s.charAt( 0 );
               buildOutput();
            }

         } // end anonymous inner class

      ); // end call to addActionListener

      container.add( inputField );
      outputArea = new JTextArea( 10, 20 );
      container.add( outputArea );

      setSize( 300, 220 );  // set the window size
      setVisible( true);    // show the window

   } // end constructor

   // display character info in outputArea
   private void buildOutput()
   {
      outputArea.setText( "is defined: " + Character.isDefined( c ) +
         "\nis digit: " + Character.isDigit( c ) +
         "\nis first character in a Java identifier: " +
         Character.isJavaIdentifierStart( c ) +
         "\nis part of a Java identifier: " +
         Character.isJavaIdentifierPart( c ) +
         "\nis letter: " + Character.isLetter( c ) +
         "\nis letter or digit: " + Character.isLetterOrDigit( c ) +
         "\nis lower case: " + Character.isLowerCase( c ) +
         "\nis upper case: " + Character.isUpperCase( c ) +
         "\nto upper case: " + Character.toUpperCase( c ) +
         "\nto lower case: " + Character.toLowerCase( c ) );
   }

   // create StaticCharMethods object to begin execution
   public static void main( String args[] )
   {
      StaticCharMethods application = new StaticCharMethods();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   }

} // end class StaticCharMethods

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