未分类题

阅读以下说明和Java代码，将应填入(n)处的语句写在对应栏内。
【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;