홍대 자바 수업 : 리스트형(스크롤형) 버튼 텍스트 필드 컬러와 배경 색 바꾸기 .

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import javax.swing.*; import javax.swing.event.*; import java.util.*;   public class ListTest extends JFrame {    private JTextField text;    private JList colorList;    Random ra =new Random(System.currentTimeMillis());           private Container container;    private final String colorNames[] = { "Black", "Blue", "Cyan",       "Dark Gray", "Gray", "Green", "Light Gray", "Magenta",       "Orange", "Pink", "Red", "White", "Yellow" };    private final Color colors[] = { Color.BLACK, Color.BLUE, Color.CYAN,       Color.DARK_GRAY, Color.GRAY, Color.GREEN, Color.LIGHT_GRAY,       Color.MAGENTA, Color.ORANGE, Color.PINK, Color.RED, Color.WHITE,       Color.YELLOW };    public ListTest()    {                super( "Color Test" );               container = getContentPane();       container.setLayout( new FlowLayout() );       colorList = new JList( colorNames );       colorList.setVisibleRowCount( 5 );  //보이는 버튼수       colorList.setSelectionMode( ListSelectionModel.SINGLE_SELECTION );//하나만 선택       container.add( new JScrollPane( colorList ) );       text=new JTextField(10);       container.add(text);       text.setFont( new Font( "굴림체", Font.PLAIN,38) );//폰트 체 등등 .             colorList.addListSelectionListener(          new ListSelectionListener() {  // anonymous inner class             public void valueChanged( ListSelectionEvent event )             {                 int a =ra.nextInt(13);//난수                text.setText(colorNames[colorList.getSelectedIndex()]);                container.setBackground(colors [ colorList.getSelectedIndex() ]);//colorList.getSelectedIndex().toString();             text.setBackground(                   colors[ a ] );                if (a>=12)                {                    text.setForeground(                   colors[ a-6 ] );                }                  else                 {                    text.setForeground(                   colors[ a+1 ] );                 }               }          } // end anonymous inner class       ); // end call to addListSelectionListener       setSize( 350, 150 );       setVisible( true );    } // end ListTest constructor    public static void main( String args[] )    {       ListTest application = new ListTest();       application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );    } } // end class ListTest   //리스트 목록 뽑아 오기 for (int i=0; i<colorlist.getmodel().getsize();i++){<br>  System.out.println(colorList.getModel().getElementAt(i).toString()); } </colorlist.getmodel().getsize();i++){<br>