JScrollPane的简单使用实例

/**
 *
 */
package JavaGUI;
/**
 * @author FlyingFire

 * @date: 2011-5-26 上午09:37:19

 * @version :2011-5-26
 *
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class JScrollpane implements ActionListener{
          JScrollPane scrollPane;
          public JScrollpane(){
             JFrame f=new JFrame("JScrollpane1");
             //Container contentPane=f.getContentPane();
          
             JLabel label1=new JLabel(new ImageIcon("C:\\Documents and Settings\\Administrator\\桌面\\psb.jpg"));
             JPanel panel1=new JPanel();
             panel1.add(label1);
             scrollPane=new JScrollPane(panel1);
             JPanel panel2=new JPanel(new GridLayout(3,1));
             JButton b=new JButton("显示水平滚动轴");
             b.addActionListener(this);
             panel2.add(b);
             b=new JButton("不要显示水平滚动轴");
             b.addActionListener(this);
             panel2.add(b);
             b=new JButton("适时显示水平滚动轴");
             b.addActionListener(this);
             panel2.add(b);
             b=new JButton("显示垂直滚动轴");
             b.addActionListener(this);
             panel2.add(b);
             b=new JButton("不要显示垂直滚动轴");
             b.addActionListener(this);
             panel2.add(b);
             b=new JButton("适时显示垂直滚动轴");
             b.addActionListener(this);
             panel2.add(b);
             f.add(panel2,BorderLayout.WEST);
             f.add(scrollPane,BorderLayout.CENTER);
          
             f.setLocationRelativeTo(null);
             f.setSize(new Dimension(550,320));
             f.setVisible(true);
             }
          /*控制JScollPane中是否显示滚动轴的六个常量
           *HORIZONTAL_SCROLLBAR_ALWAYS：总是显示水平滚动轴
           *HORIZONTAL_SCROLLBAR_AS_NEEDED:需要的时候，显示水平滚动轴
           *HORIZONTAL_SCROLLBAR_NEVER:从来不显示水平滚动轴
           *VERTICAL_SCROLLBAR_ALWAYS:总是显示垂直滚动轴
           *VERTICAL_SCROLLBAR_AS_NEEDED：需要的时候，显示垂直滚动轴
           *VERTICAL_SCROLLBAR_NEVER:从来不显示垂直滚动轴
           */
          public void actionPerformed(ActionEvent e){
              if(e.getActionCommand().equals("显示水平滚动轴"))
               
              scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
              if(e.getActionCommand().equals("不要显示水平滚动轴"))
                scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
          
              if(e.getActionCommand().equals("适时显示水平滚动轴"))
                scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
               if(e.getActionCommand().equals("显示垂直滚动轴"))
               scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS) ;
               if(e.getActionCommand().equals("不要显示垂直滚动轴"))
                scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER);
             
               if(e.getActionCommand().equals("适时显示垂直滚动轴"))
                scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
                scrollPane.revalidate();//重新载入JScrollPane
          }
          public static void main(String[] args){
                  new JScrollpane();
      }
}