java下拉框，滚动条

 package com.soft.test;

 /**
  * 下拉列表、下拉框、滚动条的使用
  */

 import javax.swing.*;
 import java.awt.*;
 public class Dem5 extends JFrame {

  private JPanel jp1, jp2;
  private JLabel jlb1, jlb2;
  private JComboBox jb1;
  private JList jl;
  private JScrollPane jsp;

  public Dem5() {
   jp1 = new JPanel();
   jp2 = new JPanel();
   jlb1 = new JLabel("籍贯");
   jlb2 = new JLabel("旅游地点");

   String []jz = {"南昌","赣州","吉安","新余","鹰潭","景德镇","抚州"};
   jb1 = new JComboBox(jz);
   String []ly = {"三清山","将军园","龙虎山","庐山","腾王阁"};

   jl = new JList(ly);
   jsp = new JScrollPane(jl);
   jl.setVisibleRowCount();

   this.setLayout(new GridLayout(, ));

   jp1.add(jlb1);
   jp1.add(jb1);
   jp2.add(jlb2);
   jp2.add(jsp);
   this.add(jp1);
   this.add(jp2);
   this.setSize(,);
   this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   this.setLocation(,);
   this.setVisible(true);
   this.setResizable(false);
  }

  public static void main(String args[]) {

   Dem5 dem5 = new Dem5();
  }
 }