JSlider sd[2]; 编译不过

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
//import javax.swing.border.*;public class picbtn extends JFrame{
   static picbtn f=new picbtn();   picbtn(){
      super("pic btn");
   }   public static void main(String[] ss){
      
      //Box hb=new Box.createHorizontalBox();      Icon ic=new ImageIcon("ga.gif");
      JButton bn=new JButton("pic-test",ic);      JSlider sd[2];   //picbtn.java:23: 需要 ']'      for (int i=0;i<2;i++){
      sd[i] =new JSlider(JSlider.VERTICAL,0,100,50);      //sd[i].setMajorTickSpacing(50);
      //sd[i].setMinorTickSpacing(20);
      sd[i].setPaintTicks(true);
      sd[i].setBackground(Color.orange);
      sd[i].setSnapToTicks(true);      sd[i].addChangeListener(new ChangeListener(){
      public void stateChanged(ChangeEvent e){
         JSlider s1=(JSlider)e.getSource();
         //if(e.getSource()==sd){
            f.setTitle(""+s1.getValue());
         //}
      }
      });      f.add(sd[i]);      }      //hb.add(sd);
      //hb.add(hb.createHorizontalStrut(15));
      f.setDefaultCloseOperation(EXIT_ON_CLOSE);
      
      
      f.setSize(400,400);
f.setVisible(true);
      
   }
}