【说明】 本程序通过移动滑动条修改颜色RGB值，从而控制颜色。程序中有一个面板、3个标签和3个滑动条，标签和滑动条一一对应，分别对应三原色红、绿、蓝，任意拖动其中的一个滑动条，所对应的颜色值就会发生变化，面板的颜色也会发生对应的变化，如下图所示，滑动条值的范围是0～255。

【Java代码】 import java.awt.*; import java.awt.event.*; import javax.swing.*; public class simple extends JFrame implements AdjustmentListener{ public simple(){ setTitle("simple"); setSize(300, 200); addWindowListener(new WindowAdapter(){ public void windowClosing( (1) ){ System.exit(0); } }); Container contentPane=getContentPane(); JPanel p= (2) ; p.setLayout(new GridLayout(3, 2)); p.add(redLabel=new JLabel("Red 0")); p.add(red=new JScrollBar(Adjustable. HORIZONTAL, 0, 0, 0, 255)); red.setBlocklncrement(16); red.addAdjustmentListener(this); p.add(greenLabel= (3) ("Green 0")); p.add(green=new JScrollBar(Adjustable.HORIZONTAL 0, 0, 0, 255)); green setBIocklncrement(16); green.addAdjustmentListener(this); p.add(blueLabel=new JLabel("Blue 0")); p.add(btue=new JScrollBar(Adjustable. HORIZONTAL, 0, 0, 0, 255)); blue,setBIocklncrement(16); blue.addAdjustmentListener(this); contentPane.add(p, "South"); colorPanet=new JPanel(); colorPanet.setBackground(new Color(0, 0, 0)); contentPane.add( (4) ,"Center"); }public void adjustmentValueChanged(AdjustmentEvent evt){ redLabel.setText("Red"+red.getValue()); greenLabel.setText("Green"+green.getValue()); blueLabel.setText("Blue"+blue.getValue()); coiorPanel.setBackground(new Color(red.getValue(), green.getValue(), blue.getValue())); colorPanel.repaint(); } public static void main(String[] args){ JFrame f= (5) ; f.show(); } private JLabel redLabel; private JLabel greenLabel; private JLabel blueLabel; private JScrollBar red; private JScroilBar green; private JScrollBar blue; private JPanel colorPanel;