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;