텍스트 필드와 버튼

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Add extends JFrame {
   private JButton addButton, printButton;
   Panel pan01,pan02;
   JTextField text01,text02;
   StringBuffer str=new StringBuffer();
   public Add()
   {
		super( "이름추가" );
	
		text01 = new JTextField( 5 );
		text02 = new JTextField( 10 );
		text02.setEditable(false);
		Container container = getContentPane();
		container.setLayout(new GridLayout(2,1));

		addButton = new JButton( "추가" );
		printButton = new JButton( "출력" );
        
		pan01=new Panel();
		pan02=new Panel();
	    container.add( pan01 );
		container.add( pan02 );
		
		pan01.setLayout(new BorderLayout());
		pan01.add(BorderLayout.WEST,text01);

	    pan01.add(BorderLayout.EAST,addButton);



		pan01.setLayout(new GridLayout(1,2));
		pan02.setLayout(new BorderLayout());

		pan02.add(BorderLayout.NORTH,text02);
		pan02.add(BorderLayout.SOUTH,printButton);
		
	    
	  
	    
	    
	    ButtonHandler handler = new ButtonHandler();//액션이 발생하면 아래 내부 클래스로 넘김 
	    addButton.addActionListener( handler );
	    printButton.addActionListener( handler );
	    setSize( 275, 150 );
	    setVisible( true );
   } 
   public static void main( String args[] )
   { 
      Add application = new Add();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   }
   private class ButtonHandler implements ActionListener {
      public void actionPerformed( ActionEvent event )
      {	
         if("추가".equals(event.getActionCommand()))
         {
			JOptionPane.showMessageDialog(Add.this,
            "You pressed: " + text01.getText()+"추가합니다" );
			str.append(text01.getText()+" ");
			System.out.println(text01.getText()+"추가합니다");
			text01.setText("");
         }
		 else 
		  {	
			String str02= str.substring(0); 
			System.out.println(str02);
			text02.setText(str02);
		  }
      }
   } 
}