텍스트 필드와 버튼

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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);           }       }    } }